from django.core.exceptions import FieldDoesNotExist from django.db import ( IntegrityError, connection, migrations, models, transaction, ) from django.db.migrations.migration import Migration from django.db.migrations.operations.fields import FieldOperation from django.db.migrations.state import ModelState, ProjectState from django.db.models.functions import Abs from django.db.transaction import atomic from django.test import SimpleTestCase, override_settings, skipUnlessDBFeature from django.test.utils import CaptureQueriesContext from .models import FoodManager, FoodQuerySet, UnicodeModel from .test_base import OperationTestBase class Mixin: pass class OperationTests(OperationTestBase): """ Tests running the operations and making sure they do what they say they do. Each test looks at their state changing, and then their database operation - both forwards and backwards. """ def test_create_model(self): """ Tests the CreateModel operation. Most other tests use this operation as part of setup, so check failures here first. """ operation = migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.IntegerField(default=1)), ], ) self.assertEqual(operation.describe(), "Create model Pony") self.assertEqual(operation.migration_name_fragment, 'pony') # Test the state alteration project_state = ProjectState() new_state = project_state.clone() operation.state_forwards("test_crmo", new_state) self.assertEqual(new_state.models["test_crmo", "pony"].name, "Pony") self.assertEqual(len(new_state.models["test_crmo", "pony"].fields), 2) # Test the database alteration self.assertTableNotExists("test_crmo_pony") with connection.schema_editor() as editor: operation.database_forwards("test_crmo", editor, project_state, new_state) self.assertTableExists("test_crmo_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crmo", editor, new_state, project_state) self.assertTableNotExists("test_crmo_pony") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "CreateModel") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["fields", "name"]) # And default manager not in set operation = migrations.CreateModel("Foo", fields=[], managers=[("objects", models.Manager())]) definition = operation.deconstruct() self.assertNotIn('managers', definition[2]) def test_create_model_with_duplicate_field_name(self): with self.assertRaisesMessage(ValueError, 'Found duplicate value pink in CreateModel fields argument.'): migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.TextField()), ("pink", models.IntegerField(default=1)), ], ) def test_create_model_with_duplicate_base(self): message = 'Found duplicate value test_crmo.pony in CreateModel bases argument.' with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=("test_crmo.Pony", "test_crmo.Pony",), ) with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=("test_crmo.Pony", "test_crmo.pony",), ) message = 'Found duplicate value migrations.unicodemodel in CreateModel bases argument.' with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=(UnicodeModel, UnicodeModel,), ) with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=(UnicodeModel, 'migrations.unicodemodel',), ) with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=(UnicodeModel, 'migrations.UnicodeModel',), ) message = "Found duplicate value in CreateModel bases argument." with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=(models.Model, models.Model,), ) message = "Found duplicate value in CreateModel bases argument." with self.assertRaisesMessage(ValueError, message): migrations.CreateModel( "Pony", fields=[], bases=(Mixin, Mixin,), ) def test_create_model_with_duplicate_manager_name(self): with self.assertRaisesMessage(ValueError, 'Found duplicate value objects in CreateModel managers argument.'): migrations.CreateModel( "Pony", fields=[], managers=[ ("objects", models.Manager()), ("objects", models.Manager()), ], ) def test_create_model_with_unique_after(self): """ Tests the CreateModel operation directly followed by an AlterUniqueTogether (bug #22844 - sqlite remake issues) """ operation1 = migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.IntegerField(default=1)), ], ) operation2 = migrations.CreateModel( "Rider", [ ("id", models.AutoField(primary_key=True)), ("number", models.IntegerField(default=1)), ("pony", models.ForeignKey("test_crmoua.Pony", models.CASCADE)), ], ) operation3 = migrations.AlterUniqueTogether( "Rider", [ ("number", "pony"), ], ) # Test the database alteration project_state = ProjectState() self.assertTableNotExists("test_crmoua_pony") self.assertTableNotExists("test_crmoua_rider") with connection.schema_editor() as editor: new_state = project_state.clone() operation1.state_forwards("test_crmoua", new_state) operation1.database_forwards("test_crmoua", editor, project_state, new_state) project_state, new_state = new_state, new_state.clone() operation2.state_forwards("test_crmoua", new_state) operation2.database_forwards("test_crmoua", editor, project_state, new_state) project_state, new_state = new_state, new_state.clone() operation3.state_forwards("test_crmoua", new_state) operation3.database_forwards("test_crmoua", editor, project_state, new_state) self.assertTableExists("test_crmoua_pony") self.assertTableExists("test_crmoua_rider") def test_create_model_m2m(self): """ Test the creation of a model with a ManyToMany field and the auto-created "through" model. """ project_state = self.set_up_test_model("test_crmomm") operation = migrations.CreateModel( "Stable", [ ("id", models.AutoField(primary_key=True)), ("ponies", models.ManyToManyField("Pony", related_name="stables")) ] ) # Test the state alteration new_state = project_state.clone() operation.state_forwards("test_crmomm", new_state) # Test the database alteration self.assertTableNotExists("test_crmomm_stable_ponies") with connection.schema_editor() as editor: operation.database_forwards("test_crmomm", editor, project_state, new_state) self.assertTableExists("test_crmomm_stable") self.assertTableExists("test_crmomm_stable_ponies") self.assertColumnNotExists("test_crmomm_stable", "ponies") # Make sure the M2M field actually works with atomic(): Pony = new_state.apps.get_model("test_crmomm", "Pony") Stable = new_state.apps.get_model("test_crmomm", "Stable") stable = Stable.objects.create() p1 = Pony.objects.create(pink=False, weight=4.55) p2 = Pony.objects.create(pink=True, weight=5.43) stable.ponies.add(p1, p2) self.assertEqual(stable.ponies.count(), 2) stable.ponies.all().delete() # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crmomm", editor, new_state, project_state) self.assertTableNotExists("test_crmomm_stable") self.assertTableNotExists("test_crmomm_stable_ponies") def test_create_model_inheritance(self): """ Tests the CreateModel operation on a multi-table inheritance setup. """ project_state = self.set_up_test_model("test_crmoih") # Test the state alteration operation = migrations.CreateModel( "ShetlandPony", [ ('pony_ptr', models.OneToOneField( 'test_crmoih.Pony', models.CASCADE, auto_created=True, primary_key=True, to_field='id', serialize=False, )), ("cuteness", models.IntegerField(default=1)), ], ) new_state = project_state.clone() operation.state_forwards("test_crmoih", new_state) self.assertIn(("test_crmoih", "shetlandpony"), new_state.models) # Test the database alteration self.assertTableNotExists("test_crmoih_shetlandpony") with connection.schema_editor() as editor: operation.database_forwards("test_crmoih", editor, project_state, new_state) self.assertTableExists("test_crmoih_shetlandpony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crmoih", editor, new_state, project_state) self.assertTableNotExists("test_crmoih_shetlandpony") def test_create_proxy_model(self): """ CreateModel ignores proxy models. """ project_state = self.set_up_test_model("test_crprmo") # Test the state alteration operation = migrations.CreateModel( "ProxyPony", [], options={"proxy": True}, bases=("test_crprmo.Pony",), ) self.assertEqual(operation.describe(), "Create proxy model ProxyPony") new_state = project_state.clone() operation.state_forwards("test_crprmo", new_state) self.assertIn(("test_crprmo", "proxypony"), new_state.models) # Test the database alteration self.assertTableNotExists("test_crprmo_proxypony") self.assertTableExists("test_crprmo_pony") with connection.schema_editor() as editor: operation.database_forwards("test_crprmo", editor, project_state, new_state) self.assertTableNotExists("test_crprmo_proxypony") self.assertTableExists("test_crprmo_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crprmo", editor, new_state, project_state) self.assertTableNotExists("test_crprmo_proxypony") self.assertTableExists("test_crprmo_pony") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "CreateModel") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["bases", "fields", "name", "options"]) def test_create_unmanaged_model(self): """ CreateModel ignores unmanaged models. """ project_state = self.set_up_test_model("test_crummo") # Test the state alteration operation = migrations.CreateModel( "UnmanagedPony", [], options={"proxy": True}, bases=("test_crummo.Pony",), ) self.assertEqual(operation.describe(), "Create proxy model UnmanagedPony") new_state = project_state.clone() operation.state_forwards("test_crummo", new_state) self.assertIn(("test_crummo", "unmanagedpony"), new_state.models) # Test the database alteration self.assertTableNotExists("test_crummo_unmanagedpony") self.assertTableExists("test_crummo_pony") with connection.schema_editor() as editor: operation.database_forwards("test_crummo", editor, project_state, new_state) self.assertTableNotExists("test_crummo_unmanagedpony") self.assertTableExists("test_crummo_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crummo", editor, new_state, project_state) self.assertTableNotExists("test_crummo_unmanagedpony") self.assertTableExists("test_crummo_pony") @skipUnlessDBFeature('supports_table_check_constraints') def test_create_model_with_constraint(self): where = models.Q(pink__gt=2) check_constraint = models.CheckConstraint(check=where, name='test_constraint_pony_pink_gt_2') operation = migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.IntegerField(default=3)), ], options={'constraints': [check_constraint]}, ) # Test the state alteration project_state = ProjectState() new_state = project_state.clone() operation.state_forwards("test_crmo", new_state) self.assertEqual(len(new_state.models['test_crmo', 'pony'].options['constraints']), 1) # Test database alteration self.assertTableNotExists("test_crmo_pony") with connection.schema_editor() as editor: operation.database_forwards("test_crmo", editor, project_state, new_state) self.assertTableExists("test_crmo_pony") with connection.cursor() as cursor: with self.assertRaises(IntegrityError): cursor.execute("INSERT INTO test_crmo_pony (id, pink) VALUES (1, 1)") # Test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crmo", editor, new_state, project_state) self.assertTableNotExists("test_crmo_pony") # Test deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "CreateModel") self.assertEqual(definition[1], []) self.assertEqual(definition[2]['options']['constraints'], [check_constraint]) def test_create_model_with_partial_unique_constraint(self): partial_unique_constraint = models.UniqueConstraint( fields=['pink'], condition=models.Q(weight__gt=5), name='test_constraint_pony_pink_for_weight_gt_5_uniq', ) operation = migrations.CreateModel( 'Pony', [ ('id', models.AutoField(primary_key=True)), ('pink', models.IntegerField(default=3)), ('weight', models.FloatField()), ], options={'constraints': [partial_unique_constraint]}, ) # Test the state alteration project_state = ProjectState() new_state = project_state.clone() operation.state_forwards('test_crmo', new_state) self.assertEqual(len(new_state.models['test_crmo', 'pony'].options['constraints']), 1) # Test database alteration self.assertTableNotExists('test_crmo_pony') with connection.schema_editor() as editor: operation.database_forwards('test_crmo', editor, project_state, new_state) self.assertTableExists('test_crmo_pony') # Test constraint works Pony = new_state.apps.get_model('test_crmo', 'Pony') Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=6.0) if connection.features.supports_partial_indexes: with self.assertRaises(IntegrityError): Pony.objects.create(pink=1, weight=7.0) else: Pony.objects.create(pink=1, weight=7.0) # Test reversal with connection.schema_editor() as editor: operation.database_backwards('test_crmo', editor, new_state, project_state) self.assertTableNotExists('test_crmo_pony') # Test deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], 'CreateModel') self.assertEqual(definition[1], []) self.assertEqual(definition[2]['options']['constraints'], [partial_unique_constraint]) def test_create_model_with_deferred_unique_constraint(self): deferred_unique_constraint = models.UniqueConstraint( fields=['pink'], name='deferrable_pink_constraint', deferrable=models.Deferrable.DEFERRED, ) operation = migrations.CreateModel( 'Pony', [ ('id', models.AutoField(primary_key=True)), ('pink', models.IntegerField(default=3)), ], options={'constraints': [deferred_unique_constraint]}, ) project_state = ProjectState() new_state = project_state.clone() operation.state_forwards('test_crmo', new_state) self.assertEqual(len(new_state.models['test_crmo', 'pony'].options['constraints']), 1) self.assertTableNotExists('test_crmo_pony') # Create table. with connection.schema_editor() as editor: operation.database_forwards('test_crmo', editor, project_state, new_state) self.assertTableExists('test_crmo_pony') Pony = new_state.apps.get_model('test_crmo', 'Pony') Pony.objects.create(pink=1) if connection.features.supports_deferrable_unique_constraints: # Unique constraint is deferred. with transaction.atomic(): obj = Pony.objects.create(pink=1) obj.pink = 2 obj.save() # Constraint behavior can be changed with SET CONSTRAINTS. with self.assertRaises(IntegrityError): with transaction.atomic(), connection.cursor() as cursor: quoted_name = connection.ops.quote_name(deferred_unique_constraint.name) cursor.execute('SET CONSTRAINTS %s IMMEDIATE' % quoted_name) obj = Pony.objects.create(pink=1) obj.pink = 3 obj.save() else: Pony.objects.create(pink=1) # Reversal. with connection.schema_editor() as editor: operation.database_backwards('test_crmo', editor, new_state, project_state) self.assertTableNotExists('test_crmo_pony') # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'CreateModel') self.assertEqual(definition[1], []) self.assertEqual( definition[2]['options']['constraints'], [deferred_unique_constraint], ) @skipUnlessDBFeature('supports_covering_indexes') def test_create_model_with_covering_unique_constraint(self): covering_unique_constraint = models.UniqueConstraint( fields=['pink'], include=['weight'], name='test_constraint_pony_pink_covering_weight', ) operation = migrations.CreateModel( 'Pony', [ ('id', models.AutoField(primary_key=True)), ('pink', models.IntegerField(default=3)), ('weight', models.FloatField()), ], options={'constraints': [covering_unique_constraint]}, ) project_state = ProjectState() new_state = project_state.clone() operation.state_forwards('test_crmo', new_state) self.assertEqual(len(new_state.models['test_crmo', 'pony'].options['constraints']), 1) self.assertTableNotExists('test_crmo_pony') # Create table. with connection.schema_editor() as editor: operation.database_forwards('test_crmo', editor, project_state, new_state) self.assertTableExists('test_crmo_pony') Pony = new_state.apps.get_model('test_crmo', 'Pony') Pony.objects.create(pink=1, weight=4.0) with self.assertRaises(IntegrityError): Pony.objects.create(pink=1, weight=7.0) # Reversal. with connection.schema_editor() as editor: operation.database_backwards('test_crmo', editor, new_state, project_state) self.assertTableNotExists('test_crmo_pony') # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'CreateModel') self.assertEqual(definition[1], []) self.assertEqual( definition[2]['options']['constraints'], [covering_unique_constraint], ) def test_create_model_managers(self): """ The managers on a model are set. """ project_state = self.set_up_test_model("test_cmoma") # Test the state alteration operation = migrations.CreateModel( "Food", fields=[ ("id", models.AutoField(primary_key=True)), ], managers=[ ("food_qs", FoodQuerySet.as_manager()), ("food_mgr", FoodManager("a", "b")), ("food_mgr_kwargs", FoodManager("x", "y", 3, 4)), ] ) self.assertEqual(operation.describe(), "Create model Food") new_state = project_state.clone() operation.state_forwards("test_cmoma", new_state) self.assertIn(("test_cmoma", "food"), new_state.models) managers = new_state.models["test_cmoma", "food"].managers self.assertEqual(managers[0][0], "food_qs") self.assertIsInstance(managers[0][1], models.Manager) self.assertEqual(managers[1][0], "food_mgr") self.assertIsInstance(managers[1][1], FoodManager) self.assertEqual(managers[1][1].args, ("a", "b", 1, 2)) self.assertEqual(managers[2][0], "food_mgr_kwargs") self.assertIsInstance(managers[2][1], FoodManager) self.assertEqual(managers[2][1].args, ("x", "y", 3, 4)) def test_delete_model(self): """ Tests the DeleteModel operation. """ project_state = self.set_up_test_model("test_dlmo") # Test the state alteration operation = migrations.DeleteModel("Pony") self.assertEqual(operation.describe(), "Delete model Pony") self.assertEqual(operation.migration_name_fragment, 'delete_pony') new_state = project_state.clone() operation.state_forwards("test_dlmo", new_state) self.assertNotIn(("test_dlmo", "pony"), new_state.models) # Test the database alteration self.assertTableExists("test_dlmo_pony") with connection.schema_editor() as editor: operation.database_forwards("test_dlmo", editor, project_state, new_state) self.assertTableNotExists("test_dlmo_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_dlmo", editor, new_state, project_state) self.assertTableExists("test_dlmo_pony") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "DeleteModel") self.assertEqual(definition[1], []) self.assertEqual(list(definition[2]), ["name"]) def test_delete_proxy_model(self): """ Tests the DeleteModel operation ignores proxy models. """ project_state = self.set_up_test_model("test_dlprmo", proxy_model=True) # Test the state alteration operation = migrations.DeleteModel("ProxyPony") new_state = project_state.clone() operation.state_forwards("test_dlprmo", new_state) self.assertIn(("test_dlprmo", "proxypony"), project_state.models) self.assertNotIn(("test_dlprmo", "proxypony"), new_state.models) # Test the database alteration self.assertTableExists("test_dlprmo_pony") self.assertTableNotExists("test_dlprmo_proxypony") with connection.schema_editor() as editor: operation.database_forwards("test_dlprmo", editor, project_state, new_state) self.assertTableExists("test_dlprmo_pony") self.assertTableNotExists("test_dlprmo_proxypony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_dlprmo", editor, new_state, project_state) self.assertTableExists("test_dlprmo_pony") self.assertTableNotExists("test_dlprmo_proxypony") def test_delete_mti_model(self): project_state = self.set_up_test_model('test_dlmtimo', mti_model=True) # Test the state alteration operation = migrations.DeleteModel('ShetlandPony') new_state = project_state.clone() operation.state_forwards('test_dlmtimo', new_state) self.assertIn(('test_dlmtimo', 'shetlandpony'), project_state.models) self.assertNotIn(('test_dlmtimo', 'shetlandpony'), new_state.models) # Test the database alteration self.assertTableExists('test_dlmtimo_pony') self.assertTableExists('test_dlmtimo_shetlandpony') self.assertColumnExists('test_dlmtimo_shetlandpony', 'pony_ptr_id') with connection.schema_editor() as editor: operation.database_forwards('test_dlmtimo', editor, project_state, new_state) self.assertTableExists('test_dlmtimo_pony') self.assertTableNotExists('test_dlmtimo_shetlandpony') # And test reversal with connection.schema_editor() as editor: operation.database_backwards('test_dlmtimo', editor, new_state, project_state) self.assertTableExists('test_dlmtimo_pony') self.assertTableExists('test_dlmtimo_shetlandpony') self.assertColumnExists('test_dlmtimo_shetlandpony', 'pony_ptr_id') def test_rename_model(self): """ Tests the RenameModel operation. """ project_state = self.set_up_test_model("test_rnmo", related_model=True) # Test the state alteration operation = migrations.RenameModel("Pony", "Horse") self.assertEqual(operation.describe(), "Rename model Pony to Horse") self.assertEqual(operation.migration_name_fragment, 'rename_pony_horse') # Test initial state and database self.assertIn(("test_rnmo", "pony"), project_state.models) self.assertNotIn(("test_rnmo", "horse"), project_state.models) self.assertTableExists("test_rnmo_pony") self.assertTableNotExists("test_rnmo_horse") if connection.features.supports_foreign_keys: self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id")) self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id")) # Migrate forwards new_state = project_state.clone() atomic_rename = connection.features.supports_atomic_references_rename new_state = self.apply_operations("test_rnmo", new_state, [operation], atomic=atomic_rename) # Test new state and database self.assertNotIn(("test_rnmo", "pony"), new_state.models) self.assertIn(("test_rnmo", "horse"), new_state.models) # RenameModel also repoints all incoming FKs and M2Ms self.assertEqual( new_state.models['test_rnmo', 'rider'].fields['pony'].remote_field.model, 'test_rnmo.Horse', ) self.assertTableNotExists("test_rnmo_pony") self.assertTableExists("test_rnmo_horse") if connection.features.supports_foreign_keys: self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id")) self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id")) # Migrate backwards original_state = self.unapply_operations("test_rnmo", project_state, [operation], atomic=atomic_rename) # Test original state and database self.assertIn(("test_rnmo", "pony"), original_state.models) self.assertNotIn(("test_rnmo", "horse"), original_state.models) self.assertEqual( original_state.models['test_rnmo', 'rider'].fields['pony'].remote_field.model, 'Pony', ) self.assertTableExists("test_rnmo_pony") self.assertTableNotExists("test_rnmo_horse") if connection.features.supports_foreign_keys: self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id")) self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id")) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RenameModel") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'old_name': "Pony", 'new_name': "Horse"}) def test_rename_model_state_forwards(self): """ RenameModel operations shouldn't trigger the caching of rendered apps on state without prior apps. """ state = ProjectState() state.add_model(ModelState('migrations', 'Foo', [])) operation = migrations.RenameModel('Foo', 'Bar') operation.state_forwards('migrations', state) self.assertNotIn('apps', state.__dict__) self.assertNotIn(('migrations', 'foo'), state.models) self.assertIn(('migrations', 'bar'), state.models) # Now with apps cached. apps = state.apps operation = migrations.RenameModel('Bar', 'Foo') operation.state_forwards('migrations', state) self.assertIs(state.apps, apps) self.assertNotIn(('migrations', 'bar'), state.models) self.assertIn(('migrations', 'foo'), state.models) def test_rename_model_with_self_referential_fk(self): """ Tests the RenameModel operation on model with self referential FK. """ project_state = self.set_up_test_model("test_rmwsrf", related_model=True) # Test the state alteration operation = migrations.RenameModel("Rider", "HorseRider") self.assertEqual(operation.describe(), "Rename model Rider to HorseRider") new_state = project_state.clone() operation.state_forwards("test_rmwsrf", new_state) self.assertNotIn(("test_rmwsrf", "rider"), new_state.models) self.assertIn(("test_rmwsrf", "horserider"), new_state.models) # Remember, RenameModel also repoints all incoming FKs and M2Ms self.assertEqual( 'self', new_state.models["test_rmwsrf", "horserider"].fields['friend'].remote_field.model ) HorseRider = new_state.apps.get_model('test_rmwsrf', 'horserider') self.assertIs(HorseRider._meta.get_field('horserider').remote_field.model, HorseRider) # Test the database alteration self.assertTableExists("test_rmwsrf_rider") self.assertTableNotExists("test_rmwsrf_horserider") if connection.features.supports_foreign_keys: self.assertFKExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_rider", "id")) self.assertFKNotExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_horserider", "id")) atomic_rename = connection.features.supports_atomic_references_rename with connection.schema_editor(atomic=atomic_rename) as editor: operation.database_forwards("test_rmwsrf", editor, project_state, new_state) self.assertTableNotExists("test_rmwsrf_rider") self.assertTableExists("test_rmwsrf_horserider") if connection.features.supports_foreign_keys: self.assertFKNotExists("test_rmwsrf_horserider", ["friend_id"], ("test_rmwsrf_rider", "id")) self.assertFKExists("test_rmwsrf_horserider", ["friend_id"], ("test_rmwsrf_horserider", "id")) # And test reversal with connection.schema_editor(atomic=atomic_rename) as editor: operation.database_backwards("test_rmwsrf", editor, new_state, project_state) self.assertTableExists("test_rmwsrf_rider") self.assertTableNotExists("test_rmwsrf_horserider") if connection.features.supports_foreign_keys: self.assertFKExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_rider", "id")) self.assertFKNotExists("test_rmwsrf_rider", ["friend_id"], ("test_rmwsrf_horserider", "id")) def test_rename_model_with_superclass_fk(self): """ Tests the RenameModel operation on a model which has a superclass that has a foreign key. """ project_state = self.set_up_test_model("test_rmwsc", related_model=True, mti_model=True) # Test the state alteration operation = migrations.RenameModel("ShetlandPony", "LittleHorse") self.assertEqual(operation.describe(), "Rename model ShetlandPony to LittleHorse") new_state = project_state.clone() operation.state_forwards("test_rmwsc", new_state) self.assertNotIn(("test_rmwsc", "shetlandpony"), new_state.models) self.assertIn(("test_rmwsc", "littlehorse"), new_state.models) # RenameModel shouldn't repoint the superclass's relations, only local ones self.assertEqual( project_state.models['test_rmwsc', 'rider'].fields['pony'].remote_field.model, new_state.models['test_rmwsc', 'rider'].fields['pony'].remote_field.model, ) # Before running the migration we have a table for Shetland Pony, not Little Horse self.assertTableExists("test_rmwsc_shetlandpony") self.assertTableNotExists("test_rmwsc_littlehorse") if connection.features.supports_foreign_keys: # and the foreign key on rider points to pony, not shetland pony self.assertFKExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_pony", "id")) self.assertFKNotExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_shetlandpony", "id")) with connection.schema_editor(atomic=connection.features.supports_atomic_references_rename) as editor: operation.database_forwards("test_rmwsc", editor, project_state, new_state) # Now we have a little horse table, not shetland pony self.assertTableNotExists("test_rmwsc_shetlandpony") self.assertTableExists("test_rmwsc_littlehorse") if connection.features.supports_foreign_keys: # but the Foreign keys still point at pony, not little horse self.assertFKExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_pony", "id")) self.assertFKNotExists("test_rmwsc_rider", ["pony_id"], ("test_rmwsc_littlehorse", "id")) def test_rename_model_with_self_referential_m2m(self): app_label = "test_rename_model_with_self_referential_m2m" project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel("ReflexivePony", fields=[ ("id", models.AutoField(primary_key=True)), ("ponies", models.ManyToManyField("self")), ]), ]) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.RenameModel("ReflexivePony", "ReflexivePony2"), ], atomic=connection.features.supports_atomic_references_rename) Pony = project_state.apps.get_model(app_label, "ReflexivePony2") pony = Pony.objects.create() pony.ponies.add(pony) def test_rename_model_with_m2m(self): app_label = "test_rename_model_with_m2m" project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel("Rider", fields=[ ("id", models.AutoField(primary_key=True)), ]), migrations.CreateModel("Pony", fields=[ ("id", models.AutoField(primary_key=True)), ("riders", models.ManyToManyField("Rider")), ]), ]) Pony = project_state.apps.get_model(app_label, "Pony") Rider = project_state.apps.get_model(app_label, "Rider") pony = Pony.objects.create() rider = Rider.objects.create() pony.riders.add(rider) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.RenameModel("Pony", "Pony2"), ], atomic=connection.features.supports_atomic_references_rename) Pony = project_state.apps.get_model(app_label, "Pony2") Rider = project_state.apps.get_model(app_label, "Rider") pony = Pony.objects.create() rider = Rider.objects.create() pony.riders.add(rider) self.assertEqual(Pony.objects.count(), 2) self.assertEqual(Rider.objects.count(), 2) self.assertEqual(Pony._meta.get_field('riders').remote_field.through.objects.count(), 2) def test_rename_m2m_target_model(self): app_label = "test_rename_m2m_target_model" project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel("Rider", fields=[ ("id", models.AutoField(primary_key=True)), ]), migrations.CreateModel("Pony", fields=[ ("id", models.AutoField(primary_key=True)), ("riders", models.ManyToManyField("Rider")), ]), ]) Pony = project_state.apps.get_model(app_label, "Pony") Rider = project_state.apps.get_model(app_label, "Rider") pony = Pony.objects.create() rider = Rider.objects.create() pony.riders.add(rider) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.RenameModel("Rider", "Rider2"), ], atomic=connection.features.supports_atomic_references_rename) Pony = project_state.apps.get_model(app_label, "Pony") Rider = project_state.apps.get_model(app_label, "Rider2") pony = Pony.objects.create() rider = Rider.objects.create() pony.riders.add(rider) self.assertEqual(Pony.objects.count(), 2) self.assertEqual(Rider.objects.count(), 2) self.assertEqual(Pony._meta.get_field('riders').remote_field.through.objects.count(), 2) def test_rename_m2m_through_model(self): app_label = "test_rename_through" project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel("Rider", fields=[ ("id", models.AutoField(primary_key=True)), ]), migrations.CreateModel("Pony", fields=[ ("id", models.AutoField(primary_key=True)), ]), migrations.CreateModel("PonyRider", fields=[ ("id", models.AutoField(primary_key=True)), ("rider", models.ForeignKey("test_rename_through.Rider", models.CASCADE)), ("pony", models.ForeignKey("test_rename_through.Pony", models.CASCADE)), ]), migrations.AddField( "Pony", "riders", models.ManyToManyField("test_rename_through.Rider", through="test_rename_through.PonyRider"), ), ]) Pony = project_state.apps.get_model(app_label, "Pony") Rider = project_state.apps.get_model(app_label, "Rider") PonyRider = project_state.apps.get_model(app_label, "PonyRider") pony = Pony.objects.create() rider = Rider.objects.create() PonyRider.objects.create(pony=pony, rider=rider) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.RenameModel("PonyRider", "PonyRider2"), ]) Pony = project_state.apps.get_model(app_label, "Pony") Rider = project_state.apps.get_model(app_label, "Rider") PonyRider = project_state.apps.get_model(app_label, "PonyRider2") pony = Pony.objects.first() rider = Rider.objects.create() PonyRider.objects.create(pony=pony, rider=rider) self.assertEqual(Pony.objects.count(), 1) self.assertEqual(Rider.objects.count(), 2) self.assertEqual(PonyRider.objects.count(), 2) self.assertEqual(pony.riders.count(), 2) def test_rename_m2m_model_after_rename_field(self): """RenameModel renames a many-to-many column after a RenameField.""" app_label = 'test_rename_multiple' project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel('Pony', fields=[ ('id', models.AutoField(primary_key=True)), ('name', models.CharField(max_length=20)), ]), migrations.CreateModel('Rider', fields=[ ('id', models.AutoField(primary_key=True)), ('pony', models.ForeignKey('test_rename_multiple.Pony', models.CASCADE)), ]), migrations.CreateModel('PonyRider', fields=[ ('id', models.AutoField(primary_key=True)), ('riders', models.ManyToManyField('Rider')), ]), migrations.RenameField(model_name='pony', old_name='name', new_name='fancy_name'), migrations.RenameModel(old_name='Rider', new_name='Jockey'), ], atomic=connection.features.supports_atomic_references_rename) Pony = project_state.apps.get_model(app_label, 'Pony') Jockey = project_state.apps.get_model(app_label, 'Jockey') PonyRider = project_state.apps.get_model(app_label, 'PonyRider') # No "no such column" error means the column was renamed correctly. pony = Pony.objects.create(fancy_name='a good name') jockey = Jockey.objects.create(pony=pony) ponyrider = PonyRider.objects.create() ponyrider.riders.add(jockey) def test_add_field(self): """ Tests the AddField operation. """ # Test the state alteration operation = migrations.AddField( "Pony", "height", models.FloatField(null=True, default=5), ) self.assertEqual(operation.describe(), "Add field height to Pony") self.assertEqual(operation.migration_name_fragment, 'pony_height') project_state, new_state = self.make_test_state("test_adfl", operation) self.assertEqual(len(new_state.models["test_adfl", "pony"].fields), 4) field = new_state.models['test_adfl', 'pony'].fields['height'] self.assertEqual(field.default, 5) # Test the database alteration self.assertColumnNotExists("test_adfl_pony", "height") with connection.schema_editor() as editor: operation.database_forwards("test_adfl", editor, project_state, new_state) self.assertColumnExists("test_adfl_pony", "height") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_adfl", editor, new_state, project_state) self.assertColumnNotExists("test_adfl_pony", "height") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AddField") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["field", "model_name", "name"]) def test_add_charfield(self): """ Tests the AddField operation on TextField. """ project_state = self.set_up_test_model("test_adchfl") Pony = project_state.apps.get_model("test_adchfl", "Pony") pony = Pony.objects.create(weight=42) new_state = self.apply_operations("test_adchfl", project_state, [ migrations.AddField( "Pony", "text", models.CharField(max_length=10, default="some text"), ), migrations.AddField( "Pony", "empty", models.CharField(max_length=10, default=""), ), # If not properly quoted digits would be interpreted as an int. migrations.AddField( "Pony", "digits", models.CharField(max_length=10, default="42"), ), # Manual quoting is fragile and could trip on quotes. Refs #xyz. migrations.AddField( "Pony", "quotes", models.CharField(max_length=10, default='"\'"'), ), ]) Pony = new_state.apps.get_model("test_adchfl", "Pony") pony = Pony.objects.get(pk=pony.pk) self.assertEqual(pony.text, "some text") self.assertEqual(pony.empty, "") self.assertEqual(pony.digits, "42") self.assertEqual(pony.quotes, '"\'"') def test_add_textfield(self): """ Tests the AddField operation on TextField. """ project_state = self.set_up_test_model("test_adtxtfl") Pony = project_state.apps.get_model("test_adtxtfl", "Pony") pony = Pony.objects.create(weight=42) new_state = self.apply_operations("test_adtxtfl", project_state, [ migrations.AddField( "Pony", "text", models.TextField(default="some text"), ), migrations.AddField( "Pony", "empty", models.TextField(default=""), ), # If not properly quoted digits would be interpreted as an int. migrations.AddField( "Pony", "digits", models.TextField(default="42"), ), # Manual quoting is fragile and could trip on quotes. Refs #xyz. migrations.AddField( "Pony", "quotes", models.TextField(default='"\'"'), ), ]) Pony = new_state.apps.get_model("test_adtxtfl", "Pony") pony = Pony.objects.get(pk=pony.pk) self.assertEqual(pony.text, "some text") self.assertEqual(pony.empty, "") self.assertEqual(pony.digits, "42") self.assertEqual(pony.quotes, '"\'"') def test_add_binaryfield(self): """ Tests the AddField operation on TextField/BinaryField. """ project_state = self.set_up_test_model("test_adbinfl") Pony = project_state.apps.get_model("test_adbinfl", "Pony") pony = Pony.objects.create(weight=42) new_state = self.apply_operations("test_adbinfl", project_state, [ migrations.AddField( "Pony", "blob", models.BinaryField(default=b"some text"), ), migrations.AddField( "Pony", "empty", models.BinaryField(default=b""), ), # If not properly quoted digits would be interpreted as an int. migrations.AddField( "Pony", "digits", models.BinaryField(default=b"42"), ), # Manual quoting is fragile and could trip on quotes. Refs #xyz. migrations.AddField( "Pony", "quotes", models.BinaryField(default=b'"\'"'), ), ]) Pony = new_state.apps.get_model("test_adbinfl", "Pony") pony = Pony.objects.get(pk=pony.pk) # SQLite returns buffer/memoryview, cast to bytes for checking. self.assertEqual(bytes(pony.blob), b"some text") self.assertEqual(bytes(pony.empty), b"") self.assertEqual(bytes(pony.digits), b"42") self.assertEqual(bytes(pony.quotes), b'"\'"') def test_column_name_quoting(self): """ Column names that are SQL keywords shouldn't cause problems when used in migrations (#22168). """ project_state = self.set_up_test_model("test_regr22168") operation = migrations.AddField( "Pony", "order", models.IntegerField(default=0), ) new_state = project_state.clone() operation.state_forwards("test_regr22168", new_state) with connection.schema_editor() as editor: operation.database_forwards("test_regr22168", editor, project_state, new_state) self.assertColumnExists("test_regr22168_pony", "order") def test_add_field_preserve_default(self): """ Tests the AddField operation's state alteration when preserve_default = False. """ project_state = self.set_up_test_model("test_adflpd") # Test the state alteration operation = migrations.AddField( "Pony", "height", models.FloatField(null=True, default=4), preserve_default=False, ) new_state = project_state.clone() operation.state_forwards("test_adflpd", new_state) self.assertEqual(len(new_state.models["test_adflpd", "pony"].fields), 4) field = new_state.models['test_adflpd', 'pony'].fields['height'] self.assertEqual(field.default, models.NOT_PROVIDED) # Test the database alteration project_state.apps.get_model("test_adflpd", "pony").objects.create( weight=4, ) self.assertColumnNotExists("test_adflpd_pony", "height") with connection.schema_editor() as editor: operation.database_forwards("test_adflpd", editor, project_state, new_state) self.assertColumnExists("test_adflpd_pony", "height") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AddField") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["field", "model_name", "name", "preserve_default"]) def test_add_field_m2m(self): """ Tests the AddField operation with a ManyToManyField. """ project_state = self.set_up_test_model("test_adflmm", second_model=True) # Test the state alteration operation = migrations.AddField("Pony", "stables", models.ManyToManyField("Stable", related_name="ponies")) new_state = project_state.clone() operation.state_forwards("test_adflmm", new_state) self.assertEqual(len(new_state.models["test_adflmm", "pony"].fields), 4) # Test the database alteration self.assertTableNotExists("test_adflmm_pony_stables") with connection.schema_editor() as editor: operation.database_forwards("test_adflmm", editor, project_state, new_state) self.assertTableExists("test_adflmm_pony_stables") self.assertColumnNotExists("test_adflmm_pony", "stables") # Make sure the M2M field actually works with atomic(): Pony = new_state.apps.get_model("test_adflmm", "Pony") p = Pony.objects.create(pink=False, weight=4.55) p.stables.create() self.assertEqual(p.stables.count(), 1) p.stables.all().delete() # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_adflmm", editor, new_state, project_state) self.assertTableNotExists("test_adflmm_pony_stables") def test_alter_field_m2m(self): project_state = self.set_up_test_model("test_alflmm", second_model=True) project_state = self.apply_operations("test_alflmm", project_state, operations=[ migrations.AddField("Pony", "stables", models.ManyToManyField("Stable", related_name="ponies")) ]) Pony = project_state.apps.get_model("test_alflmm", "Pony") self.assertFalse(Pony._meta.get_field('stables').blank) project_state = self.apply_operations("test_alflmm", project_state, operations=[ migrations.AlterField( "Pony", "stables", models.ManyToManyField(to="Stable", related_name="ponies", blank=True) ) ]) Pony = project_state.apps.get_model("test_alflmm", "Pony") self.assertTrue(Pony._meta.get_field('stables').blank) def test_repoint_field_m2m(self): project_state = self.set_up_test_model("test_alflmm", second_model=True, third_model=True) project_state = self.apply_operations("test_alflmm", project_state, operations=[ migrations.AddField("Pony", "places", models.ManyToManyField("Stable", related_name="ponies")) ]) Pony = project_state.apps.get_model("test_alflmm", "Pony") project_state = self.apply_operations("test_alflmm", project_state, operations=[ migrations.AlterField("Pony", "places", models.ManyToManyField(to="Van", related_name="ponies")) ]) # Ensure the new field actually works Pony = project_state.apps.get_model("test_alflmm", "Pony") p = Pony.objects.create(pink=False, weight=4.55) p.places.create() self.assertEqual(p.places.count(), 1) p.places.all().delete() def test_remove_field_m2m(self): project_state = self.set_up_test_model("test_rmflmm", second_model=True) project_state = self.apply_operations("test_rmflmm", project_state, operations=[ migrations.AddField("Pony", "stables", models.ManyToManyField("Stable", related_name="ponies")) ]) self.assertTableExists("test_rmflmm_pony_stables") with_field_state = project_state.clone() operations = [migrations.RemoveField("Pony", "stables")] project_state = self.apply_operations("test_rmflmm", project_state, operations=operations) self.assertTableNotExists("test_rmflmm_pony_stables") # And test reversal self.unapply_operations("test_rmflmm", with_field_state, operations=operations) self.assertTableExists("test_rmflmm_pony_stables") def test_remove_field_m2m_with_through(self): project_state = self.set_up_test_model("test_rmflmmwt", second_model=True) self.assertTableNotExists("test_rmflmmwt_ponystables") project_state = self.apply_operations("test_rmflmmwt", project_state, operations=[ migrations.CreateModel("PonyStables", fields=[ ("pony", models.ForeignKey('test_rmflmmwt.Pony', models.CASCADE)), ("stable", models.ForeignKey('test_rmflmmwt.Stable', models.CASCADE)), ]), migrations.AddField( "Pony", "stables", models.ManyToManyField("Stable", related_name="ponies", through='test_rmflmmwt.PonyStables') ) ]) self.assertTableExists("test_rmflmmwt_ponystables") operations = [migrations.RemoveField("Pony", "stables"), migrations.DeleteModel("PonyStables")] self.apply_operations("test_rmflmmwt", project_state, operations=operations) def test_remove_field(self): """ Tests the RemoveField operation. """ project_state = self.set_up_test_model("test_rmfl") # Test the state alteration operation = migrations.RemoveField("Pony", "pink") self.assertEqual(operation.describe(), "Remove field pink from Pony") self.assertEqual(operation.migration_name_fragment, 'remove_pony_pink') new_state = project_state.clone() operation.state_forwards("test_rmfl", new_state) self.assertEqual(len(new_state.models["test_rmfl", "pony"].fields), 2) # Test the database alteration self.assertColumnExists("test_rmfl_pony", "pink") with connection.schema_editor() as editor: operation.database_forwards("test_rmfl", editor, project_state, new_state) self.assertColumnNotExists("test_rmfl_pony", "pink") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_rmfl", editor, new_state, project_state) self.assertColumnExists("test_rmfl_pony", "pink") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RemoveField") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': "Pony", 'name': 'pink'}) def test_remove_fk(self): """ Tests the RemoveField operation on a foreign key. """ project_state = self.set_up_test_model("test_rfk", related_model=True) self.assertColumnExists("test_rfk_rider", "pony_id") operation = migrations.RemoveField("Rider", "pony") new_state = project_state.clone() operation.state_forwards("test_rfk", new_state) with connection.schema_editor() as editor: operation.database_forwards("test_rfk", editor, project_state, new_state) self.assertColumnNotExists("test_rfk_rider", "pony_id") with connection.schema_editor() as editor: operation.database_backwards("test_rfk", editor, new_state, project_state) self.assertColumnExists("test_rfk_rider", "pony_id") def test_alter_model_table(self): """ Tests the AlterModelTable operation. """ project_state = self.set_up_test_model("test_almota") # Test the state alteration operation = migrations.AlterModelTable("Pony", "test_almota_pony_2") self.assertEqual(operation.describe(), "Rename table for Pony to test_almota_pony_2") self.assertEqual(operation.migration_name_fragment, 'alter_pony_table') new_state = project_state.clone() operation.state_forwards("test_almota", new_state) self.assertEqual(new_state.models["test_almota", "pony"].options["db_table"], "test_almota_pony_2") # Test the database alteration self.assertTableExists("test_almota_pony") self.assertTableNotExists("test_almota_pony_2") with connection.schema_editor() as editor: operation.database_forwards("test_almota", editor, project_state, new_state) self.assertTableNotExists("test_almota_pony") self.assertTableExists("test_almota_pony_2") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_almota", editor, new_state, project_state) self.assertTableExists("test_almota_pony") self.assertTableNotExists("test_almota_pony_2") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterModelTable") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'name': "Pony", 'table': "test_almota_pony_2"}) def test_alter_model_table_none(self): """ Tests the AlterModelTable operation if the table name is set to None. """ operation = migrations.AlterModelTable("Pony", None) self.assertEqual(operation.describe(), "Rename table for Pony to (default)") def test_alter_model_table_noop(self): """ Tests the AlterModelTable operation if the table name is not changed. """ project_state = self.set_up_test_model("test_almota") # Test the state alteration operation = migrations.AlterModelTable("Pony", "test_almota_pony") new_state = project_state.clone() operation.state_forwards("test_almota", new_state) self.assertEqual(new_state.models["test_almota", "pony"].options["db_table"], "test_almota_pony") # Test the database alteration self.assertTableExists("test_almota_pony") with connection.schema_editor() as editor: operation.database_forwards("test_almota", editor, project_state, new_state) self.assertTableExists("test_almota_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_almota", editor, new_state, project_state) self.assertTableExists("test_almota_pony") def test_alter_model_table_m2m(self): """ AlterModelTable should rename auto-generated M2M tables. """ app_label = "test_talflmltlm2m" pony_db_table = 'pony_foo' project_state = self.set_up_test_model(app_label, second_model=True, db_table=pony_db_table) # Add the M2M field first_state = project_state.clone() operation = migrations.AddField("Pony", "stables", models.ManyToManyField("Stable")) operation.state_forwards(app_label, first_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, first_state) original_m2m_table = "%s_%s" % (pony_db_table, "stables") new_m2m_table = "%s_%s" % (app_label, "pony_stables") self.assertTableExists(original_m2m_table) self.assertTableNotExists(new_m2m_table) # Rename the Pony db_table which should also rename the m2m table. second_state = first_state.clone() operation = migrations.AlterModelTable(name='pony', table=None) operation.state_forwards(app_label, second_state) atomic_rename = connection.features.supports_atomic_references_rename with connection.schema_editor(atomic=atomic_rename) as editor: operation.database_forwards(app_label, editor, first_state, second_state) self.assertTableExists(new_m2m_table) self.assertTableNotExists(original_m2m_table) # And test reversal with connection.schema_editor(atomic=atomic_rename) as editor: operation.database_backwards(app_label, editor, second_state, first_state) self.assertTableExists(original_m2m_table) self.assertTableNotExists(new_m2m_table) def test_alter_field(self): """ Tests the AlterField operation. """ project_state = self.set_up_test_model("test_alfl") # Test the state alteration operation = migrations.AlterField("Pony", "pink", models.IntegerField(null=True)) self.assertEqual(operation.describe(), "Alter field pink on Pony") self.assertEqual(operation.migration_name_fragment, 'alter_pony_pink') new_state = project_state.clone() operation.state_forwards("test_alfl", new_state) self.assertIs(project_state.models['test_alfl', 'pony'].fields['pink'].null, False) self.assertIs(new_state.models['test_alfl', 'pony'].fields['pink'].null, True) # Test the database alteration self.assertColumnNotNull("test_alfl_pony", "pink") with connection.schema_editor() as editor: operation.database_forwards("test_alfl", editor, project_state, new_state) self.assertColumnNull("test_alfl_pony", "pink") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alfl", editor, new_state, project_state) self.assertColumnNotNull("test_alfl_pony", "pink") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterField") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["field", "model_name", "name"]) def test_alter_field_add_db_column_noop(self): """ AlterField operation is a noop when adding only a db_column and the column name is not changed. """ app_label = 'test_afadbn' project_state = self.set_up_test_model(app_label, related_model=True) pony_table = '%s_pony' % app_label new_state = project_state.clone() operation = migrations.AlterField('Pony', 'weight', models.FloatField(db_column='weight')) operation.state_forwards(app_label, new_state) self.assertIsNone( project_state.models[app_label, 'pony'].fields['weight'].db_column, ) self.assertEqual( new_state.models[app_label, 'pony'].fields['weight'].db_column, 'weight', ) self.assertColumnExists(pony_table, 'weight') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_forwards(app_label, editor, project_state, new_state) self.assertColumnExists(pony_table, 'weight') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_backwards(app_label, editor, new_state, project_state) self.assertColumnExists(pony_table, 'weight') rider_table = '%s_rider' % app_label new_state = project_state.clone() operation = migrations.AlterField( 'Rider', 'pony', models.ForeignKey('Pony', models.CASCADE, db_column='pony_id'), ) operation.state_forwards(app_label, new_state) self.assertIsNone( project_state.models[app_label, 'rider'].fields['pony'].db_column, ) self.assertIs( new_state.models[app_label, 'rider'].fields['pony'].db_column, 'pony_id', ) self.assertColumnExists(rider_table, 'pony_id') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_forwards(app_label, editor, project_state, new_state) self.assertColumnExists(rider_table, 'pony_id') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_forwards(app_label, editor, new_state, project_state) self.assertColumnExists(rider_table, 'pony_id') def test_alter_field_pk(self): """ Tests the AlterField operation on primary keys (for things like PostgreSQL's SERIAL weirdness) """ project_state = self.set_up_test_model("test_alflpk") # Test the state alteration operation = migrations.AlterField("Pony", "id", models.IntegerField(primary_key=True)) new_state = project_state.clone() operation.state_forwards("test_alflpk", new_state) self.assertIsInstance( project_state.models['test_alflpk', 'pony'].fields['id'], models.AutoField, ) self.assertIsInstance( new_state.models['test_alflpk', 'pony'].fields['id'], models.IntegerField, ) # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_alflpk", editor, project_state, new_state) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alflpk", editor, new_state, project_state) @skipUnlessDBFeature('supports_foreign_keys') def test_alter_field_pk_fk(self): """ Tests the AlterField operation on primary keys changes any FKs pointing to it. """ project_state = self.set_up_test_model("test_alflpkfk", related_model=True) project_state = self.apply_operations('test_alflpkfk', project_state, [ migrations.CreateModel('Stable', fields=[ ('ponies', models.ManyToManyField('Pony')), ]), migrations.AddField( 'Pony', 'stables', models.ManyToManyField('Stable'), ), ]) # Test the state alteration operation = migrations.AlterField("Pony", "id", models.FloatField(primary_key=True)) new_state = project_state.clone() operation.state_forwards("test_alflpkfk", new_state) self.assertIsInstance( project_state.models['test_alflpkfk', 'pony'].fields['id'], models.AutoField, ) self.assertIsInstance( new_state.models['test_alflpkfk', 'pony'].fields['id'], models.FloatField, ) def assertIdTypeEqualsFkType(): with connection.cursor() as cursor: id_type, id_null = [ (c.type_code, c.null_ok) for c in connection.introspection.get_table_description(cursor, "test_alflpkfk_pony") if c.name == "id" ][0] fk_type, fk_null = [ (c.type_code, c.null_ok) for c in connection.introspection.get_table_description(cursor, "test_alflpkfk_rider") if c.name == "pony_id" ][0] m2m_fk_type, m2m_fk_null = [ (c.type_code, c.null_ok) for c in connection.introspection.get_table_description( cursor, 'test_alflpkfk_pony_stables', ) if c.name == 'pony_id' ][0] remote_m2m_fk_type, remote_m2m_fk_null = [ (c.type_code, c.null_ok) for c in connection.introspection.get_table_description( cursor, 'test_alflpkfk_stable_ponies', ) if c.name == 'pony_id' ][0] self.assertEqual(id_type, fk_type) self.assertEqual(id_type, m2m_fk_type) self.assertEqual(id_type, remote_m2m_fk_type) self.assertEqual(id_null, fk_null) self.assertEqual(id_null, m2m_fk_null) self.assertEqual(id_null, remote_m2m_fk_null) assertIdTypeEqualsFkType() # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_alflpkfk", editor, project_state, new_state) assertIdTypeEqualsFkType() # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alflpkfk", editor, new_state, project_state) assertIdTypeEqualsFkType() def test_alter_field_pk_mti_fk(self): app_label = 'test_alflpkmtifk' project_state = self.set_up_test_model(app_label, mti_model=True) project_state = self.apply_operations(app_label, project_state, [ migrations.CreateModel('ShetlandRider', fields=[ ( 'pony', models.ForeignKey(f'{app_label}.ShetlandPony', models.CASCADE), ), ]), ]) operation = migrations.AlterField( 'Pony', 'id', models.BigAutoField(primary_key=True), ) new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertIsInstance( new_state.models[app_label, 'pony'].fields['id'], models.BigAutoField, ) def _get_column_id_type(cursor, table, column): return [ c.type_code for c in connection.introspection.get_table_description( cursor, f'{app_label}_{table}', ) if c.name == column ][0] def assertIdTypeEqualsMTIFkType(): with connection.cursor() as cursor: parent_id_type = _get_column_id_type(cursor, 'pony', 'id') child_id_type = _get_column_id_type(cursor, 'shetlandpony', 'pony_ptr_id') mti_id_type = _get_column_id_type(cursor, 'shetlandrider', 'pony_id') self.assertEqual(parent_id_type, child_id_type) self.assertEqual(parent_id_type, mti_id_type) assertIdTypeEqualsMTIFkType() # Alter primary key. with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) assertIdTypeEqualsMTIFkType() if connection.features.supports_foreign_keys: self.assertFKExists( f'{app_label}_shetlandpony', ['pony_ptr_id'], (f'{app_label}_pony', 'id'), ) self.assertFKExists( f'{app_label}_shetlandrider', ['pony_id'], (f'{app_label}_shetlandpony', 'pony_ptr_id'), ) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) assertIdTypeEqualsMTIFkType() if connection.features.supports_foreign_keys: self.assertFKExists( f'{app_label}_shetlandpony', ['pony_ptr_id'], (f'{app_label}_pony', 'id'), ) self.assertFKExists( f'{app_label}_shetlandrider', ['pony_id'], (f'{app_label}_shetlandpony', 'pony_ptr_id'), ) @skipUnlessDBFeature('supports_foreign_keys') def test_alter_field_reloads_state_on_fk_with_to_field_target_type_change(self): app_label = 'test_alflrsfkwtflttc' project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel('Rider', fields=[ ('id', models.AutoField(primary_key=True)), ('code', models.IntegerField(unique=True)), ]), migrations.CreateModel('Pony', fields=[ ('id', models.AutoField(primary_key=True)), ('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='code')), ]), ]) operation = migrations.AlterField( 'Rider', 'code', models.CharField(max_length=100, unique=True), ) self.apply_operations(app_label, project_state, operations=[operation]) id_type, id_null = [ (c.type_code, c.null_ok) for c in self.get_table_description('%s_rider' % app_label) if c.name == 'code' ][0] fk_type, fk_null = [ (c.type_code, c.null_ok) for c in self.get_table_description('%s_pony' % app_label) if c.name == 'rider_id' ][0] self.assertEqual(id_type, fk_type) self.assertEqual(id_null, fk_null) @skipUnlessDBFeature('supports_foreign_keys') def test_alter_field_reloads_state_on_fk_with_to_field_related_name_target_type_change(self): app_label = 'test_alflrsfkwtflrnttc' project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel('Rider', fields=[ ('id', models.AutoField(primary_key=True)), ('code', models.PositiveIntegerField(unique=True)), ]), migrations.CreateModel('Pony', fields=[ ('id', models.AutoField(primary_key=True)), ('rider', models.ForeignKey( '%s.Rider' % app_label, models.CASCADE, to_field='code', related_name='+', )), ]), ]) operation = migrations.AlterField( 'Rider', 'code', models.CharField(max_length=100, unique=True), ) self.apply_operations(app_label, project_state, operations=[operation]) def test_alter_field_reloads_state_on_fk_target_changes(self): """ If AlterField doesn't reload state appropriately, the second AlterField crashes on MySQL due to not dropping the PonyRider.pony foreign key constraint before modifying the column. """ app_label = 'alter_alter_field_reloads_state_on_fk_target_changes' project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel('Rider', fields=[ ('id', models.CharField(primary_key=True, max_length=100)), ]), migrations.CreateModel('Pony', fields=[ ('id', models.CharField(primary_key=True, max_length=100)), ('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE)), ]), migrations.CreateModel('PonyRider', fields=[ ('id', models.AutoField(primary_key=True)), ('pony', models.ForeignKey('%s.Pony' % app_label, models.CASCADE)), ]), ]) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.AlterField('Rider', 'id', models.CharField(primary_key=True, max_length=99)), migrations.AlterField('Pony', 'id', models.CharField(primary_key=True, max_length=99)), ]) def test_alter_field_reloads_state_on_fk_with_to_field_target_changes(self): """ If AlterField doesn't reload state appropriately, the second AlterField crashes on MySQL due to not dropping the PonyRider.pony foreign key constraint before modifying the column. """ app_label = 'alter_alter_field_reloads_state_on_fk_with_to_field_target_changes' project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel('Rider', fields=[ ('id', models.CharField(primary_key=True, max_length=100)), ('slug', models.CharField(unique=True, max_length=100)), ]), migrations.CreateModel('Pony', fields=[ ('id', models.CharField(primary_key=True, max_length=100)), ('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE, to_field='slug')), ('slug', models.CharField(unique=True, max_length=100)), ]), migrations.CreateModel('PonyRider', fields=[ ('id', models.AutoField(primary_key=True)), ('pony', models.ForeignKey('%s.Pony' % app_label, models.CASCADE, to_field='slug')), ]), ]) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.AlterField('Rider', 'slug', models.CharField(unique=True, max_length=99)), migrations.AlterField('Pony', 'slug', models.CharField(unique=True, max_length=99)), ]) def test_rename_field_reloads_state_on_fk_target_changes(self): """ If RenameField doesn't reload state appropriately, the AlterField crashes on MySQL due to not dropping the PonyRider.pony foreign key constraint before modifying the column. """ app_label = 'alter_rename_field_reloads_state_on_fk_target_changes' project_state = self.apply_operations(app_label, ProjectState(), operations=[ migrations.CreateModel('Rider', fields=[ ('id', models.CharField(primary_key=True, max_length=100)), ]), migrations.CreateModel('Pony', fields=[ ('id', models.CharField(primary_key=True, max_length=100)), ('rider', models.ForeignKey('%s.Rider' % app_label, models.CASCADE)), ]), migrations.CreateModel('PonyRider', fields=[ ('id', models.AutoField(primary_key=True)), ('pony', models.ForeignKey('%s.Pony' % app_label, models.CASCADE)), ]), ]) project_state = self.apply_operations(app_label, project_state, operations=[ migrations.RenameField('Rider', 'id', 'id2'), migrations.AlterField('Pony', 'id', models.CharField(primary_key=True, max_length=99)), ], atomic=connection.features.supports_atomic_references_rename) def test_rename_field(self): """ Tests the RenameField operation. """ project_state = self.set_up_test_model("test_rnfl", unique_together=True, index_together=True) # Test the state alteration operation = migrations.RenameField("Pony", "pink", "blue") self.assertEqual(operation.describe(), "Rename field pink on Pony to blue") self.assertEqual(operation.migration_name_fragment, 'rename_pink_pony_blue') new_state = project_state.clone() operation.state_forwards("test_rnfl", new_state) self.assertIn("blue", new_state.models["test_rnfl", "pony"].fields) self.assertNotIn("pink", new_state.models["test_rnfl", "pony"].fields) # Make sure the unique_together has the renamed column too self.assertIn("blue", new_state.models["test_rnfl", "pony"].options['unique_together'][0]) self.assertNotIn("pink", new_state.models["test_rnfl", "pony"].options['unique_together'][0]) # Make sure the index_together has the renamed column too self.assertIn("blue", new_state.models["test_rnfl", "pony"].options['index_together'][0]) self.assertNotIn("pink", new_state.models["test_rnfl", "pony"].options['index_together'][0]) # Test the database alteration self.assertColumnExists("test_rnfl_pony", "pink") self.assertColumnNotExists("test_rnfl_pony", "blue") with connection.schema_editor() as editor: operation.database_forwards("test_rnfl", editor, project_state, new_state) self.assertColumnExists("test_rnfl_pony", "blue") self.assertColumnNotExists("test_rnfl_pony", "pink") # Ensure the unique constraint has been ported over with connection.cursor() as cursor: cursor.execute("INSERT INTO test_rnfl_pony (blue, weight) VALUES (1, 1)") with self.assertRaises(IntegrityError): with atomic(): cursor.execute("INSERT INTO test_rnfl_pony (blue, weight) VALUES (1, 1)") cursor.execute("DELETE FROM test_rnfl_pony") # Ensure the index constraint has been ported over self.assertIndexExists("test_rnfl_pony", ["weight", "blue"]) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_rnfl", editor, new_state, project_state) self.assertColumnExists("test_rnfl_pony", "pink") self.assertColumnNotExists("test_rnfl_pony", "blue") # Ensure the index constraint has been reset self.assertIndexExists("test_rnfl_pony", ["weight", "pink"]) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RenameField") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': "Pony", 'old_name': "pink", 'new_name': "blue"}) def test_rename_field_with_db_column(self): project_state = self.apply_operations('test_rfwdbc', ProjectState(), operations=[ migrations.CreateModel('Pony', fields=[ ('id', models.AutoField(primary_key=True)), ('field', models.IntegerField(db_column='db_field')), ('fk_field', models.ForeignKey( 'Pony', models.CASCADE, db_column='db_fk_field', )), ]), ]) new_state = project_state.clone() operation = migrations.RenameField('Pony', 'field', 'renamed_field') operation.state_forwards('test_rfwdbc', new_state) self.assertIn('renamed_field', new_state.models['test_rfwdbc', 'pony'].fields) self.assertNotIn('field', new_state.models['test_rfwdbc', 'pony'].fields) self.assertColumnExists('test_rfwdbc_pony', 'db_field') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_forwards('test_rfwdbc', editor, project_state, new_state) self.assertColumnExists('test_rfwdbc_pony', 'db_field') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_backwards('test_rfwdbc', editor, new_state, project_state) self.assertColumnExists('test_rfwdbc_pony', 'db_field') new_state = project_state.clone() operation = migrations.RenameField('Pony', 'fk_field', 'renamed_fk_field') operation.state_forwards('test_rfwdbc', new_state) self.assertIn('renamed_fk_field', new_state.models['test_rfwdbc', 'pony'].fields) self.assertNotIn('fk_field', new_state.models['test_rfwdbc', 'pony'].fields) self.assertColumnExists('test_rfwdbc_pony', 'db_fk_field') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_forwards('test_rfwdbc', editor, project_state, new_state) self.assertColumnExists('test_rfwdbc_pony', 'db_fk_field') with connection.schema_editor() as editor: with self.assertNumQueries(0): operation.database_backwards('test_rfwdbc', editor, new_state, project_state) self.assertColumnExists('test_rfwdbc_pony', 'db_fk_field') def test_rename_field_case(self): project_state = self.apply_operations('test_rfmx', ProjectState(), operations=[ migrations.CreateModel('Pony', fields=[ ('id', models.AutoField(primary_key=True)), ('field', models.IntegerField()), ]), ]) new_state = project_state.clone() operation = migrations.RenameField('Pony', 'field', 'FiElD') operation.state_forwards('test_rfmx', new_state) self.assertIn('FiElD', new_state.models['test_rfmx', 'pony'].fields) self.assertColumnExists('test_rfmx_pony', 'field') with connection.schema_editor() as editor: operation.database_forwards('test_rfmx', editor, project_state, new_state) self.assertColumnExists( 'test_rfmx_pony', connection.introspection.identifier_converter('FiElD'), ) with connection.schema_editor() as editor: operation.database_backwards('test_rfmx', editor, new_state, project_state) self.assertColumnExists('test_rfmx_pony', 'field') def test_rename_missing_field(self): state = ProjectState() state.add_model(ModelState('app', 'model', [])) with self.assertRaisesMessage(FieldDoesNotExist, "app.model has no field named 'field'"): migrations.RenameField('model', 'field', 'new_field').state_forwards('app', state) def test_rename_referenced_field_state_forward(self): state = ProjectState() state.add_model(ModelState('app', 'Model', [ ('id', models.AutoField(primary_key=True)), ('field', models.IntegerField(unique=True)), ])) state.add_model(ModelState('app', 'OtherModel', [ ('id', models.AutoField(primary_key=True)), ('fk', models.ForeignKey('Model', models.CASCADE, to_field='field')), ('fo', models.ForeignObject('Model', models.CASCADE, from_fields=('fk',), to_fields=('field',))), ])) operation = migrations.RenameField('Model', 'field', 'renamed') new_state = state.clone() operation.state_forwards('app', new_state) self.assertEqual(new_state.models['app', 'othermodel'].fields['fk'].remote_field.field_name, 'renamed') self.assertEqual(new_state.models['app', 'othermodel'].fields['fk'].from_fields, ['self']) self.assertEqual(new_state.models['app', 'othermodel'].fields['fk'].to_fields, ('renamed',)) self.assertEqual(new_state.models['app', 'othermodel'].fields['fo'].from_fields, ('fk',)) self.assertEqual(new_state.models['app', 'othermodel'].fields['fo'].to_fields, ('renamed',)) operation = migrations.RenameField('OtherModel', 'fk', 'renamed_fk') new_state = state.clone() operation.state_forwards('app', new_state) self.assertEqual(new_state.models['app', 'othermodel'].fields['renamed_fk'].remote_field.field_name, 'renamed') self.assertEqual(new_state.models['app', 'othermodel'].fields['renamed_fk'].from_fields, ('self',)) self.assertEqual(new_state.models['app', 'othermodel'].fields['renamed_fk'].to_fields, ('renamed',)) self.assertEqual(new_state.models['app', 'othermodel'].fields['fo'].from_fields, ('renamed_fk',)) self.assertEqual(new_state.models['app', 'othermodel'].fields['fo'].to_fields, ('renamed',)) def test_alter_unique_together(self): """ Tests the AlterUniqueTogether operation. """ project_state = self.set_up_test_model("test_alunto") # Test the state alteration operation = migrations.AlterUniqueTogether("Pony", [("pink", "weight")]) self.assertEqual(operation.describe(), "Alter unique_together for Pony (1 constraint(s))") self.assertEqual( operation.migration_name_fragment, 'alter_pony_unique_together', ) new_state = project_state.clone() operation.state_forwards("test_alunto", new_state) self.assertEqual(len(project_state.models["test_alunto", "pony"].options.get("unique_together", set())), 0) self.assertEqual(len(new_state.models["test_alunto", "pony"].options.get("unique_together", set())), 1) # Make sure we can insert duplicate rows with connection.cursor() as cursor: cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)") cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)") cursor.execute("DELETE FROM test_alunto_pony") # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_alunto", editor, project_state, new_state) cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)") with self.assertRaises(IntegrityError): with atomic(): cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)") cursor.execute("DELETE FROM test_alunto_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alunto", editor, new_state, project_state) cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)") cursor.execute("INSERT INTO test_alunto_pony (pink, weight) VALUES (1, 1)") cursor.execute("DELETE FROM test_alunto_pony") # Test flat unique_together operation = migrations.AlterUniqueTogether("Pony", ("pink", "weight")) operation.state_forwards("test_alunto", new_state) self.assertEqual(len(new_state.models["test_alunto", "pony"].options.get("unique_together", set())), 1) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterUniqueTogether") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'name': "Pony", 'unique_together': {("pink", "weight")}}) def test_alter_unique_together_remove(self): operation = migrations.AlterUniqueTogether("Pony", None) self.assertEqual(operation.describe(), "Alter unique_together for Pony (0 constraint(s))") def test_add_index(self): """ Test the AddIndex operation. """ project_state = self.set_up_test_model("test_adin") msg = ( "Indexes passed to AddIndex operations require a name argument. " " doesn't have one." ) with self.assertRaisesMessage(ValueError, msg): migrations.AddIndex("Pony", models.Index(fields=["pink"])) index = models.Index(fields=["pink"], name="test_adin_pony_pink_idx") operation = migrations.AddIndex("Pony", index) self.assertEqual(operation.describe(), "Create index test_adin_pony_pink_idx on field(s) pink of model Pony") self.assertEqual( operation.migration_name_fragment, 'pony_test_adin_pony_pink_idx', ) new_state = project_state.clone() operation.state_forwards("test_adin", new_state) # Test the database alteration self.assertEqual(len(new_state.models["test_adin", "pony"].options['indexes']), 1) self.assertIndexNotExists("test_adin_pony", ["pink"]) with connection.schema_editor() as editor: operation.database_forwards("test_adin", editor, project_state, new_state) self.assertIndexExists("test_adin_pony", ["pink"]) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_adin", editor, new_state, project_state) self.assertIndexNotExists("test_adin_pony", ["pink"]) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AddIndex") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': "Pony", 'index': index}) def test_remove_index(self): """ Test the RemoveIndex operation. """ project_state = self.set_up_test_model("test_rmin", multicol_index=True) self.assertTableExists("test_rmin_pony") self.assertIndexExists("test_rmin_pony", ["pink", "weight"]) operation = migrations.RemoveIndex("Pony", "pony_test_idx") self.assertEqual(operation.describe(), "Remove index pony_test_idx from Pony") self.assertEqual( operation.migration_name_fragment, 'remove_pony_pony_test_idx', ) new_state = project_state.clone() operation.state_forwards("test_rmin", new_state) # Test the state alteration self.assertEqual(len(new_state.models["test_rmin", "pony"].options['indexes']), 0) self.assertIndexExists("test_rmin_pony", ["pink", "weight"]) # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_rmin", editor, project_state, new_state) self.assertIndexNotExists("test_rmin_pony", ["pink", "weight"]) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_rmin", editor, new_state, project_state) self.assertIndexExists("test_rmin_pony", ["pink", "weight"]) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RemoveIndex") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': "Pony", 'name': "pony_test_idx"}) # Also test a field dropped with index - sqlite remake issue operations = [ migrations.RemoveIndex("Pony", "pony_test_idx"), migrations.RemoveField("Pony", "pink"), ] self.assertColumnExists("test_rmin_pony", "pink") self.assertIndexExists("test_rmin_pony", ["pink", "weight"]) # Test database alteration new_state = project_state.clone() self.apply_operations('test_rmin', new_state, operations=operations) self.assertColumnNotExists("test_rmin_pony", "pink") self.assertIndexNotExists("test_rmin_pony", ["pink", "weight"]) # And test reversal self.unapply_operations("test_rmin", project_state, operations=operations) self.assertIndexExists("test_rmin_pony", ["pink", "weight"]) def test_add_index_state_forwards(self): project_state = self.set_up_test_model('test_adinsf') index = models.Index(fields=['pink'], name='test_adinsf_pony_pink_idx') old_model = project_state.apps.get_model('test_adinsf', 'Pony') new_state = project_state.clone() operation = migrations.AddIndex('Pony', index) operation.state_forwards('test_adinsf', new_state) new_model = new_state.apps.get_model('test_adinsf', 'Pony') self.assertIsNot(old_model, new_model) def test_remove_index_state_forwards(self): project_state = self.set_up_test_model('test_rminsf') index = models.Index(fields=['pink'], name='test_rminsf_pony_pink_idx') migrations.AddIndex('Pony', index).state_forwards('test_rminsf', project_state) old_model = project_state.apps.get_model('test_rminsf', 'Pony') new_state = project_state.clone() operation = migrations.RemoveIndex('Pony', 'test_rminsf_pony_pink_idx') operation.state_forwards('test_rminsf', new_state) new_model = new_state.apps.get_model('test_rminsf', 'Pony') self.assertIsNot(old_model, new_model) @skipUnlessDBFeature('supports_expression_indexes') def test_add_func_index(self): app_label = 'test_addfuncin' index_name = f'{app_label}_pony_abs_idx' table_name = f'{app_label}_pony' project_state = self.set_up_test_model(app_label) index = models.Index(Abs('weight'), name=index_name) operation = migrations.AddIndex('Pony', index) self.assertEqual( operation.describe(), 'Create index test_addfuncin_pony_abs_idx on Abs(F(weight)) on model Pony', ) self.assertEqual( operation.migration_name_fragment, 'pony_test_addfuncin_pony_abs_idx', ) new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['indexes']), 1) self.assertIndexNameNotExists(table_name, index_name) # Add index. with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) self.assertIndexNameExists(table_name, index_name) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) self.assertIndexNameNotExists(table_name, index_name) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'AddIndex') self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': 'Pony', 'index': index}) @skipUnlessDBFeature('supports_expression_indexes') def test_remove_func_index(self): app_label = 'test_rmfuncin' index_name = f'{app_label}_pony_abs_idx' table_name = f'{app_label}_pony' project_state = self.set_up_test_model(app_label, indexes=[ models.Index(Abs('weight'), name=index_name), ]) self.assertTableExists(table_name) self.assertIndexNameExists(table_name, index_name) operation = migrations.RemoveIndex('Pony', index_name) self.assertEqual( operation.describe(), 'Remove index test_rmfuncin_pony_abs_idx from Pony', ) self.assertEqual( operation.migration_name_fragment, 'remove_pony_test_rmfuncin_pony_abs_idx', ) new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['indexes']), 0) # Remove index. with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) self.assertIndexNameNotExists(table_name, index_name) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) self.assertIndexNameExists(table_name, index_name) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'RemoveIndex') self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': 'Pony', 'name': index_name}) def test_alter_field_with_index(self): """ Test AlterField operation with an index to ensure indexes created via Meta.indexes don't get dropped with sqlite3 remake. """ project_state = self.set_up_test_model("test_alflin", index=True) operation = migrations.AlterField("Pony", "pink", models.IntegerField(null=True)) new_state = project_state.clone() operation.state_forwards("test_alflin", new_state) # Test the database alteration self.assertColumnNotNull("test_alflin_pony", "pink") with connection.schema_editor() as editor: operation.database_forwards("test_alflin", editor, project_state, new_state) # Index hasn't been dropped self.assertIndexExists("test_alflin_pony", ["pink"]) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alflin", editor, new_state, project_state) # Ensure the index is still there self.assertIndexExists("test_alflin_pony", ["pink"]) def test_alter_index_together(self): """ Tests the AlterIndexTogether operation. """ project_state = self.set_up_test_model("test_alinto") # Test the state alteration operation = migrations.AlterIndexTogether("Pony", [("pink", "weight")]) self.assertEqual(operation.describe(), "Alter index_together for Pony (1 constraint(s))") self.assertEqual( operation.migration_name_fragment, 'alter_pony_index_together', ) new_state = project_state.clone() operation.state_forwards("test_alinto", new_state) self.assertEqual(len(project_state.models["test_alinto", "pony"].options.get("index_together", set())), 0) self.assertEqual(len(new_state.models["test_alinto", "pony"].options.get("index_together", set())), 1) # Make sure there's no matching index self.assertIndexNotExists("test_alinto_pony", ["pink", "weight"]) # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_alinto", editor, project_state, new_state) self.assertIndexExists("test_alinto_pony", ["pink", "weight"]) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alinto", editor, new_state, project_state) self.assertIndexNotExists("test_alinto_pony", ["pink", "weight"]) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterIndexTogether") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'name': "Pony", 'index_together': {("pink", "weight")}}) def test_alter_index_together_remove(self): operation = migrations.AlterIndexTogether("Pony", None) self.assertEqual(operation.describe(), "Alter index_together for Pony (0 constraint(s))") @skipUnlessDBFeature('allows_multiple_constraints_on_same_fields') def test_alter_index_together_remove_with_unique_together(self): app_label = 'test_alintoremove_wunto' table_name = '%s_pony' % app_label project_state = self.set_up_test_model(app_label, unique_together=True) self.assertUniqueConstraintExists(table_name, ['pink', 'weight']) # Add index together. new_state = project_state.clone() operation = migrations.AlterIndexTogether('Pony', [('pink', 'weight')]) operation.state_forwards(app_label, new_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) self.assertIndexExists(table_name, ['pink', 'weight']) # Remove index together. project_state = new_state new_state = project_state.clone() operation = migrations.AlterIndexTogether('Pony', set()) operation.state_forwards(app_label, new_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) self.assertIndexNotExists(table_name, ['pink', 'weight']) self.assertUniqueConstraintExists(table_name, ['pink', 'weight']) @skipUnlessDBFeature('supports_table_check_constraints') def test_add_constraint(self): project_state = self.set_up_test_model("test_addconstraint") gt_check = models.Q(pink__gt=2) gt_constraint = models.CheckConstraint(check=gt_check, name="test_add_constraint_pony_pink_gt_2") gt_operation = migrations.AddConstraint("Pony", gt_constraint) self.assertEqual( gt_operation.describe(), "Create constraint test_add_constraint_pony_pink_gt_2 on model Pony" ) self.assertEqual( gt_operation.migration_name_fragment, 'pony_test_add_constraint_pony_pink_gt_2', ) # Test the state alteration new_state = project_state.clone() gt_operation.state_forwards("test_addconstraint", new_state) self.assertEqual(len(new_state.models["test_addconstraint", "pony"].options["constraints"]), 1) Pony = new_state.apps.get_model("test_addconstraint", "Pony") self.assertEqual(len(Pony._meta.constraints), 1) # Test the database alteration with connection.schema_editor() as editor: gt_operation.database_forwards("test_addconstraint", editor, project_state, new_state) with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=1, weight=1.0) # Add another one. lt_check = models.Q(pink__lt=100) lt_constraint = models.CheckConstraint(check=lt_check, name="test_add_constraint_pony_pink_lt_100") lt_operation = migrations.AddConstraint("Pony", lt_constraint) lt_operation.state_forwards("test_addconstraint", new_state) self.assertEqual(len(new_state.models["test_addconstraint", "pony"].options["constraints"]), 2) Pony = new_state.apps.get_model("test_addconstraint", "Pony") self.assertEqual(len(Pony._meta.constraints), 2) with connection.schema_editor() as editor: lt_operation.database_forwards("test_addconstraint", editor, project_state, new_state) with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=100, weight=1.0) # Test reversal with connection.schema_editor() as editor: gt_operation.database_backwards("test_addconstraint", editor, new_state, project_state) Pony.objects.create(pink=1, weight=1.0) # Test deconstruction definition = gt_operation.deconstruct() self.assertEqual(definition[0], "AddConstraint") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': "Pony", 'constraint': gt_constraint}) @skipUnlessDBFeature('supports_table_check_constraints') def test_add_constraint_percent_escaping(self): app_label = 'add_constraint_string_quoting' operations = [ migrations.CreateModel( 'Author', fields=[ ('id', models.AutoField(primary_key=True)), ('name', models.CharField(max_length=100)), ('surname', models.CharField(max_length=100, default='')), ('rebate', models.CharField(max_length=100)), ], ), ] from_state = self.apply_operations(app_label, ProjectState(), operations) # "%" generated in startswith lookup should be escaped in a way that is # considered a leading wildcard. check = models.Q(name__startswith='Albert') constraint = models.CheckConstraint(check=check, name='name_constraint') operation = migrations.AddConstraint('Author', constraint) to_state = from_state.clone() operation.state_forwards(app_label, to_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, from_state, to_state) Author = to_state.apps.get_model(app_label, 'Author') with self.assertRaises(IntegrityError), transaction.atomic(): Author.objects.create(name='Artur') # Literal "%" should be escaped in a way that is not a considered a # wildcard. check = models.Q(rebate__endswith='%') constraint = models.CheckConstraint(check=check, name='rebate_constraint') operation = migrations.AddConstraint('Author', constraint) from_state = to_state to_state = from_state.clone() operation.state_forwards(app_label, to_state) Author = to_state.apps.get_model(app_label, 'Author') with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, from_state, to_state) Author = to_state.apps.get_model(app_label, 'Author') with self.assertRaises(IntegrityError), transaction.atomic(): Author.objects.create(name='Albert', rebate='10$') author = Author.objects.create(name='Albert', rebate='10%') self.assertEqual(Author.objects.get(), author) # Right-hand-side baked "%" literals should not be used for parameters # interpolation. check = ~models.Q(surname__startswith=models.F('name')) constraint = models.CheckConstraint(check=check, name='name_constraint_rhs') operation = migrations.AddConstraint('Author', constraint) from_state = to_state to_state = from_state.clone() operation.state_forwards(app_label, to_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, from_state, to_state) Author = to_state.apps.get_model(app_label, 'Author') with self.assertRaises(IntegrityError), transaction.atomic(): Author.objects.create(name='Albert', surname='Alberto') @skipUnlessDBFeature('supports_table_check_constraints') def test_add_or_constraint(self): app_label = 'test_addorconstraint' constraint_name = 'add_constraint_or' from_state = self.set_up_test_model(app_label) check = models.Q(pink__gt=2, weight__gt=2) | models.Q(weight__lt=0) constraint = models.CheckConstraint(check=check, name=constraint_name) operation = migrations.AddConstraint('Pony', constraint) to_state = from_state.clone() operation.state_forwards(app_label, to_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, from_state, to_state) Pony = to_state.apps.get_model(app_label, 'Pony') with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=2, weight=3.0) with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=3, weight=1.0) Pony.objects.bulk_create([ Pony(pink=3, weight=-1.0), Pony(pink=1, weight=-1.0), Pony(pink=3, weight=3.0), ]) @skipUnlessDBFeature('supports_table_check_constraints') def test_add_constraint_combinable(self): app_label = 'test_addconstraint_combinable' operations = [ migrations.CreateModel( 'Book', fields=[ ('id', models.AutoField(primary_key=True)), ('read', models.PositiveIntegerField()), ('unread', models.PositiveIntegerField()), ], ), ] from_state = self.apply_operations(app_label, ProjectState(), operations) constraint = models.CheckConstraint( check=models.Q(read=(100 - models.F('unread'))), name='test_addconstraint_combinable_sum_100', ) operation = migrations.AddConstraint('Book', constraint) to_state = from_state.clone() operation.state_forwards(app_label, to_state) with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, from_state, to_state) Book = to_state.apps.get_model(app_label, 'Book') with self.assertRaises(IntegrityError), transaction.atomic(): Book.objects.create(read=70, unread=10) Book.objects.create(read=70, unread=30) @skipUnlessDBFeature('supports_table_check_constraints') def test_remove_constraint(self): project_state = self.set_up_test_model("test_removeconstraint", constraints=[ models.CheckConstraint(check=models.Q(pink__gt=2), name="test_remove_constraint_pony_pink_gt_2"), models.CheckConstraint(check=models.Q(pink__lt=100), name="test_remove_constraint_pony_pink_lt_100"), ]) gt_operation = migrations.RemoveConstraint("Pony", "test_remove_constraint_pony_pink_gt_2") self.assertEqual( gt_operation.describe(), "Remove constraint test_remove_constraint_pony_pink_gt_2 from model Pony" ) self.assertEqual( gt_operation.migration_name_fragment, 'remove_pony_test_remove_constraint_pony_pink_gt_2', ) # Test state alteration new_state = project_state.clone() gt_operation.state_forwards("test_removeconstraint", new_state) self.assertEqual(len(new_state.models["test_removeconstraint", "pony"].options['constraints']), 1) Pony = new_state.apps.get_model("test_removeconstraint", "Pony") self.assertEqual(len(Pony._meta.constraints), 1) # Test database alteration with connection.schema_editor() as editor: gt_operation.database_forwards("test_removeconstraint", editor, project_state, new_state) Pony.objects.create(pink=1, weight=1.0).delete() with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=100, weight=1.0) # Remove the other one. lt_operation = migrations.RemoveConstraint("Pony", "test_remove_constraint_pony_pink_lt_100") lt_operation.state_forwards("test_removeconstraint", new_state) self.assertEqual(len(new_state.models["test_removeconstraint", "pony"].options['constraints']), 0) Pony = new_state.apps.get_model("test_removeconstraint", "Pony") self.assertEqual(len(Pony._meta.constraints), 0) with connection.schema_editor() as editor: lt_operation.database_forwards("test_removeconstraint", editor, project_state, new_state) Pony.objects.create(pink=100, weight=1.0).delete() # Test reversal with connection.schema_editor() as editor: gt_operation.database_backwards("test_removeconstraint", editor, new_state, project_state) with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=1, weight=1.0) # Test deconstruction definition = gt_operation.deconstruct() self.assertEqual(definition[0], "RemoveConstraint") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': "Pony", 'name': "test_remove_constraint_pony_pink_gt_2"}) def test_add_partial_unique_constraint(self): project_state = self.set_up_test_model('test_addpartialuniqueconstraint') partial_unique_constraint = models.UniqueConstraint( fields=['pink'], condition=models.Q(weight__gt=5), name='test_constraint_pony_pink_for_weight_gt_5_uniq', ) operation = migrations.AddConstraint('Pony', partial_unique_constraint) self.assertEqual( operation.describe(), 'Create constraint test_constraint_pony_pink_for_weight_gt_5_uniq ' 'on model Pony' ) # Test the state alteration new_state = project_state.clone() operation.state_forwards('test_addpartialuniqueconstraint', new_state) self.assertEqual(len(new_state.models['test_addpartialuniqueconstraint', 'pony'].options['constraints']), 1) Pony = new_state.apps.get_model('test_addpartialuniqueconstraint', 'Pony') self.assertEqual(len(Pony._meta.constraints), 1) # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards('test_addpartialuniqueconstraint', editor, project_state, new_state) # Test constraint works Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=6.0) if connection.features.supports_partial_indexes: with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=1, weight=7.0) else: Pony.objects.create(pink=1, weight=7.0) # Test reversal with connection.schema_editor() as editor: operation.database_backwards('test_addpartialuniqueconstraint', editor, new_state, project_state) # Test constraint doesn't work Pony.objects.create(pink=1, weight=7.0) # Test deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], 'AddConstraint') self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': 'Pony', 'constraint': partial_unique_constraint}) def test_remove_partial_unique_constraint(self): project_state = self.set_up_test_model('test_removepartialuniqueconstraint', constraints=[ models.UniqueConstraint( fields=['pink'], condition=models.Q(weight__gt=5), name='test_constraint_pony_pink_for_weight_gt_5_uniq', ), ]) gt_operation = migrations.RemoveConstraint('Pony', 'test_constraint_pony_pink_for_weight_gt_5_uniq') self.assertEqual( gt_operation.describe(), 'Remove constraint test_constraint_pony_pink_for_weight_gt_5_uniq from model Pony' ) # Test state alteration new_state = project_state.clone() gt_operation.state_forwards('test_removepartialuniqueconstraint', new_state) self.assertEqual(len(new_state.models['test_removepartialuniqueconstraint', 'pony'].options['constraints']), 0) Pony = new_state.apps.get_model('test_removepartialuniqueconstraint', 'Pony') self.assertEqual(len(Pony._meta.constraints), 0) # Test database alteration with connection.schema_editor() as editor: gt_operation.database_forwards('test_removepartialuniqueconstraint', editor, project_state, new_state) # Test constraint doesn't work Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=6.0) Pony.objects.create(pink=1, weight=7.0).delete() # Test reversal with connection.schema_editor() as editor: gt_operation.database_backwards('test_removepartialuniqueconstraint', editor, new_state, project_state) # Test constraint works if connection.features.supports_partial_indexes: with self.assertRaises(IntegrityError), transaction.atomic(): Pony.objects.create(pink=1, weight=7.0) else: Pony.objects.create(pink=1, weight=7.0) # Test deconstruction definition = gt_operation.deconstruct() self.assertEqual(definition[0], 'RemoveConstraint') self.assertEqual(definition[1], []) self.assertEqual(definition[2], { 'model_name': 'Pony', 'name': 'test_constraint_pony_pink_for_weight_gt_5_uniq', }) def test_add_deferred_unique_constraint(self): app_label = 'test_adddeferred_uc' project_state = self.set_up_test_model(app_label) deferred_unique_constraint = models.UniqueConstraint( fields=['pink'], name='deferred_pink_constraint_add', deferrable=models.Deferrable.DEFERRED, ) operation = migrations.AddConstraint('Pony', deferred_unique_constraint) self.assertEqual( operation.describe(), 'Create constraint deferred_pink_constraint_add on model Pony', ) # Add constraint. new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['constraints']), 1) Pony = new_state.apps.get_model(app_label, 'Pony') self.assertEqual(len(Pony._meta.constraints), 1) with connection.schema_editor() as editor, CaptureQueriesContext(connection) as ctx: operation.database_forwards(app_label, editor, project_state, new_state) Pony.objects.create(pink=1, weight=4.0) if connection.features.supports_deferrable_unique_constraints: # Unique constraint is deferred. with transaction.atomic(): obj = Pony.objects.create(pink=1, weight=4.0) obj.pink = 2 obj.save() # Constraint behavior can be changed with SET CONSTRAINTS. with self.assertRaises(IntegrityError): with transaction.atomic(), connection.cursor() as cursor: quoted_name = connection.ops.quote_name(deferred_unique_constraint.name) cursor.execute('SET CONSTRAINTS %s IMMEDIATE' % quoted_name) obj = Pony.objects.create(pink=1, weight=4.0) obj.pink = 3 obj.save() else: self.assertEqual(len(ctx), 0) Pony.objects.create(pink=1, weight=4.0) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) # Constraint doesn't work. Pony.objects.create(pink=1, weight=4.0) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'AddConstraint') self.assertEqual(definition[1], []) self.assertEqual( definition[2], {'model_name': 'Pony', 'constraint': deferred_unique_constraint}, ) def test_remove_deferred_unique_constraint(self): app_label = 'test_removedeferred_uc' deferred_unique_constraint = models.UniqueConstraint( fields=['pink'], name='deferred_pink_constraint_rm', deferrable=models.Deferrable.DEFERRED, ) project_state = self.set_up_test_model(app_label, constraints=[deferred_unique_constraint]) operation = migrations.RemoveConstraint('Pony', deferred_unique_constraint.name) self.assertEqual( operation.describe(), 'Remove constraint deferred_pink_constraint_rm from model Pony', ) # Remove constraint. new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['constraints']), 0) Pony = new_state.apps.get_model(app_label, 'Pony') self.assertEqual(len(Pony._meta.constraints), 0) with connection.schema_editor() as editor, CaptureQueriesContext(connection) as ctx: operation.database_forwards(app_label, editor, project_state, new_state) # Constraint doesn't work. Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=4.0).delete() if not connection.features.supports_deferrable_unique_constraints: self.assertEqual(len(ctx), 0) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) if connection.features.supports_deferrable_unique_constraints: # Unique constraint is deferred. with transaction.atomic(): obj = Pony.objects.create(pink=1, weight=4.0) obj.pink = 2 obj.save() # Constraint behavior can be changed with SET CONSTRAINTS. with self.assertRaises(IntegrityError): with transaction.atomic(), connection.cursor() as cursor: quoted_name = connection.ops.quote_name(deferred_unique_constraint.name) cursor.execute('SET CONSTRAINTS %s IMMEDIATE' % quoted_name) obj = Pony.objects.create(pink=1, weight=4.0) obj.pink = 3 obj.save() else: Pony.objects.create(pink=1, weight=4.0) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'RemoveConstraint') self.assertEqual(definition[1], []) self.assertEqual(definition[2], { 'model_name': 'Pony', 'name': 'deferred_pink_constraint_rm', }) def test_add_covering_unique_constraint(self): app_label = 'test_addcovering_uc' project_state = self.set_up_test_model(app_label) covering_unique_constraint = models.UniqueConstraint( fields=['pink'], name='covering_pink_constraint_add', include=['weight'], ) operation = migrations.AddConstraint('Pony', covering_unique_constraint) self.assertEqual( operation.describe(), 'Create constraint covering_pink_constraint_add on model Pony', ) # Add constraint. new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['constraints']), 1) Pony = new_state.apps.get_model(app_label, 'Pony') self.assertEqual(len(Pony._meta.constraints), 1) with connection.schema_editor() as editor, CaptureQueriesContext(connection) as ctx: operation.database_forwards(app_label, editor, project_state, new_state) Pony.objects.create(pink=1, weight=4.0) if connection.features.supports_covering_indexes: with self.assertRaises(IntegrityError): Pony.objects.create(pink=1, weight=4.0) else: self.assertEqual(len(ctx), 0) Pony.objects.create(pink=1, weight=4.0) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) # Constraint doesn't work. Pony.objects.create(pink=1, weight=4.0) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'AddConstraint') self.assertEqual(definition[1], []) self.assertEqual( definition[2], {'model_name': 'Pony', 'constraint': covering_unique_constraint}, ) def test_remove_covering_unique_constraint(self): app_label = 'test_removecovering_uc' covering_unique_constraint = models.UniqueConstraint( fields=['pink'], name='covering_pink_constraint_rm', include=['weight'], ) project_state = self.set_up_test_model(app_label, constraints=[covering_unique_constraint]) operation = migrations.RemoveConstraint('Pony', covering_unique_constraint.name) self.assertEqual( operation.describe(), 'Remove constraint covering_pink_constraint_rm from model Pony', ) # Remove constraint. new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['constraints']), 0) Pony = new_state.apps.get_model(app_label, 'Pony') self.assertEqual(len(Pony._meta.constraints), 0) with connection.schema_editor() as editor, CaptureQueriesContext(connection) as ctx: operation.database_forwards(app_label, editor, project_state, new_state) # Constraint doesn't work. Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=4.0).delete() if not connection.features.supports_covering_indexes: self.assertEqual(len(ctx), 0) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) if connection.features.supports_covering_indexes: with self.assertRaises(IntegrityError): Pony.objects.create(pink=1, weight=4.0) else: Pony.objects.create(pink=1, weight=4.0) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'RemoveConstraint') self.assertEqual(definition[1], []) self.assertEqual(definition[2], { 'model_name': 'Pony', 'name': 'covering_pink_constraint_rm', }) def test_add_func_unique_constraint(self): app_label = 'test_adfuncuc' constraint_name = f'{app_label}_pony_abs_uq' table_name = f'{app_label}_pony' project_state = self.set_up_test_model(app_label) constraint = models.UniqueConstraint(Abs('weight'), name=constraint_name) operation = migrations.AddConstraint('Pony', constraint) self.assertEqual( operation.describe(), 'Create constraint test_adfuncuc_pony_abs_uq on model Pony', ) self.assertEqual( operation.migration_name_fragment, 'pony_test_adfuncuc_pony_abs_uq', ) new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['constraints']), 1) self.assertIndexNameNotExists(table_name, constraint_name) # Add constraint. with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) Pony = new_state.apps.get_model(app_label, 'Pony') Pony.objects.create(weight=4.0) if connection.features.supports_expression_indexes: self.assertIndexNameExists(table_name, constraint_name) with self.assertRaises(IntegrityError): Pony.objects.create(weight=-4.0) else: self.assertIndexNameNotExists(table_name, constraint_name) Pony.objects.create(weight=-4.0) # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) self.assertIndexNameNotExists(table_name, constraint_name) # Constraint doesn't work. Pony.objects.create(weight=-4.0) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'AddConstraint') self.assertEqual(definition[1], []) self.assertEqual( definition[2], {'model_name': 'Pony', 'constraint': constraint}, ) def test_remove_func_unique_constraint(self): app_label = 'test_rmfuncuc' constraint_name = f'{app_label}_pony_abs_uq' table_name = f'{app_label}_pony' project_state = self.set_up_test_model(app_label, constraints=[ models.UniqueConstraint(Abs('weight'), name=constraint_name), ]) self.assertTableExists(table_name) if connection.features.supports_expression_indexes: self.assertIndexNameExists(table_name, constraint_name) operation = migrations.RemoveConstraint('Pony', constraint_name) self.assertEqual( operation.describe(), 'Remove constraint test_rmfuncuc_pony_abs_uq from model Pony', ) self.assertEqual( operation.migration_name_fragment, 'remove_pony_test_rmfuncuc_pony_abs_uq', ) new_state = project_state.clone() operation.state_forwards(app_label, new_state) self.assertEqual(len(new_state.models[app_label, 'pony'].options['constraints']), 0) Pony = new_state.apps.get_model(app_label, 'Pony') self.assertEqual(len(Pony._meta.constraints), 0) # Remove constraint. with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) self.assertIndexNameNotExists(table_name, constraint_name) # Constraint doesn't work. Pony.objects.create(pink=1, weight=4.0) Pony.objects.create(pink=1, weight=-4.0).delete() # Reversal. with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) if connection.features.supports_expression_indexes: self.assertIndexNameExists(table_name, constraint_name) with self.assertRaises(IntegrityError): Pony.objects.create(weight=-4.0) else: self.assertIndexNameNotExists(table_name, constraint_name) Pony.objects.create(weight=-4.0) # Deconstruction. definition = operation.deconstruct() self.assertEqual(definition[0], 'RemoveConstraint') self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'model_name': 'Pony', 'name': constraint_name}) def test_alter_model_options(self): """ Tests the AlterModelOptions operation. """ project_state = self.set_up_test_model("test_almoop") # Test the state alteration (no DB alteration to test) operation = migrations.AlterModelOptions("Pony", {"permissions": [("can_groom", "Can groom")]}) self.assertEqual(operation.describe(), "Change Meta options on Pony") self.assertEqual(operation.migration_name_fragment, 'alter_pony_options') new_state = project_state.clone() operation.state_forwards("test_almoop", new_state) self.assertEqual(len(project_state.models["test_almoop", "pony"].options.get("permissions", [])), 0) self.assertEqual(len(new_state.models["test_almoop", "pony"].options.get("permissions", [])), 1) self.assertEqual(new_state.models["test_almoop", "pony"].options["permissions"][0][0], "can_groom") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterModelOptions") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'name': "Pony", 'options': {"permissions": [("can_groom", "Can groom")]}}) def test_alter_model_options_emptying(self): """ The AlterModelOptions operation removes keys from the dict (#23121) """ project_state = self.set_up_test_model("test_almoop", options=True) # Test the state alteration (no DB alteration to test) operation = migrations.AlterModelOptions("Pony", {}) self.assertEqual(operation.describe(), "Change Meta options on Pony") new_state = project_state.clone() operation.state_forwards("test_almoop", new_state) self.assertEqual(len(project_state.models["test_almoop", "pony"].options.get("permissions", [])), 1) self.assertEqual(len(new_state.models["test_almoop", "pony"].options.get("permissions", [])), 0) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterModelOptions") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'name': "Pony", 'options': {}}) def test_alter_order_with_respect_to(self): """ Tests the AlterOrderWithRespectTo operation. """ project_state = self.set_up_test_model("test_alorwrtto", related_model=True) # Test the state alteration operation = migrations.AlterOrderWithRespectTo("Rider", "pony") self.assertEqual(operation.describe(), "Set order_with_respect_to on Rider to pony") self.assertEqual( operation.migration_name_fragment, 'alter_rider_order_with_respect_to', ) new_state = project_state.clone() operation.state_forwards("test_alorwrtto", new_state) self.assertIsNone( project_state.models["test_alorwrtto", "rider"].options.get("order_with_respect_to", None) ) self.assertEqual( new_state.models["test_alorwrtto", "rider"].options.get("order_with_respect_to", None), "pony" ) # Make sure there's no matching index self.assertColumnNotExists("test_alorwrtto_rider", "_order") # Create some rows before alteration rendered_state = project_state.apps pony = rendered_state.get_model("test_alorwrtto", "Pony").objects.create(weight=50) rider1 = rendered_state.get_model("test_alorwrtto", "Rider").objects.create(pony=pony) rider1.friend = rider1 rider1.save() rider2 = rendered_state.get_model("test_alorwrtto", "Rider").objects.create(pony=pony) rider2.friend = rider2 rider2.save() # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_alorwrtto", editor, project_state, new_state) self.assertColumnExists("test_alorwrtto_rider", "_order") # Check for correct value in rows updated_riders = new_state.apps.get_model("test_alorwrtto", "Rider").objects.all() self.assertEqual(updated_riders[0]._order, 0) self.assertEqual(updated_riders[1]._order, 0) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alorwrtto", editor, new_state, project_state) self.assertColumnNotExists("test_alorwrtto_rider", "_order") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "AlterOrderWithRespectTo") self.assertEqual(definition[1], []) self.assertEqual(definition[2], {'name': "Rider", 'order_with_respect_to': "pony"}) def test_alter_model_managers(self): """ The managers on a model are set. """ project_state = self.set_up_test_model("test_almoma") # Test the state alteration operation = migrations.AlterModelManagers( "Pony", managers=[ ("food_qs", FoodQuerySet.as_manager()), ("food_mgr", FoodManager("a", "b")), ("food_mgr_kwargs", FoodManager("x", "y", 3, 4)), ] ) self.assertEqual(operation.describe(), "Change managers on Pony") self.assertEqual(operation.migration_name_fragment, 'alter_pony_managers') managers = project_state.models["test_almoma", "pony"].managers self.assertEqual(managers, []) new_state = project_state.clone() operation.state_forwards("test_almoma", new_state) self.assertIn(("test_almoma", "pony"), new_state.models) managers = new_state.models["test_almoma", "pony"].managers self.assertEqual(managers[0][0], "food_qs") self.assertIsInstance(managers[0][1], models.Manager) self.assertEqual(managers[1][0], "food_mgr") self.assertIsInstance(managers[1][1], FoodManager) self.assertEqual(managers[1][1].args, ("a", "b", 1, 2)) self.assertEqual(managers[2][0], "food_mgr_kwargs") self.assertIsInstance(managers[2][1], FoodManager) self.assertEqual(managers[2][1].args, ("x", "y", 3, 4)) rendered_state = new_state.apps model = rendered_state.get_model('test_almoma', 'pony') self.assertIsInstance(model.food_qs, models.Manager) self.assertIsInstance(model.food_mgr, FoodManager) self.assertIsInstance(model.food_mgr_kwargs, FoodManager) def test_alter_model_managers_emptying(self): """ The managers on a model are set. """ project_state = self.set_up_test_model("test_almomae", manager_model=True) # Test the state alteration operation = migrations.AlterModelManagers("Food", managers=[]) self.assertEqual(operation.describe(), "Change managers on Food") self.assertIn(("test_almomae", "food"), project_state.models) managers = project_state.models["test_almomae", "food"].managers self.assertEqual(managers[0][0], "food_qs") self.assertIsInstance(managers[0][1], models.Manager) self.assertEqual(managers[1][0], "food_mgr") self.assertIsInstance(managers[1][1], FoodManager) self.assertEqual(managers[1][1].args, ("a", "b", 1, 2)) self.assertEqual(managers[2][0], "food_mgr_kwargs") self.assertIsInstance(managers[2][1], FoodManager) self.assertEqual(managers[2][1].args, ("x", "y", 3, 4)) new_state = project_state.clone() operation.state_forwards("test_almomae", new_state) managers = new_state.models["test_almomae", "food"].managers self.assertEqual(managers, []) def test_alter_fk(self): """ Creating and then altering an FK works correctly and deals with the pending SQL (#23091) """ project_state = self.set_up_test_model("test_alfk") # Test adding and then altering the FK in one go create_operation = migrations.CreateModel( name="Rider", fields=[ ("id", models.AutoField(primary_key=True)), ("pony", models.ForeignKey("Pony", models.CASCADE)), ], ) create_state = project_state.clone() create_operation.state_forwards("test_alfk", create_state) alter_operation = migrations.AlterField( model_name='Rider', name='pony', field=models.ForeignKey("Pony", models.CASCADE, editable=False), ) alter_state = create_state.clone() alter_operation.state_forwards("test_alfk", alter_state) with connection.schema_editor() as editor: create_operation.database_forwards("test_alfk", editor, project_state, create_state) alter_operation.database_forwards("test_alfk", editor, create_state, alter_state) def test_alter_fk_non_fk(self): """ Altering an FK to a non-FK works (#23244) """ # Test the state alteration operation = migrations.AlterField( model_name="Rider", name="pony", field=models.FloatField(), ) project_state, new_state = self.make_test_state("test_afknfk", operation, related_model=True) # Test the database alteration self.assertColumnExists("test_afknfk_rider", "pony_id") self.assertColumnNotExists("test_afknfk_rider", "pony") with connection.schema_editor() as editor: operation.database_forwards("test_afknfk", editor, project_state, new_state) self.assertColumnExists("test_afknfk_rider", "pony") self.assertColumnNotExists("test_afknfk_rider", "pony_id") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_afknfk", editor, new_state, project_state) self.assertColumnExists("test_afknfk_rider", "pony_id") self.assertColumnNotExists("test_afknfk_rider", "pony") def test_run_sql(self): """ Tests the RunSQL operation. """ project_state = self.set_up_test_model("test_runsql") # Create the operation operation = migrations.RunSQL( # Use a multi-line string with a comment to test splitting on SQLite and MySQL respectively "CREATE TABLE i_love_ponies (id int, special_thing varchar(15));\n" "INSERT INTO i_love_ponies (id, special_thing) VALUES (1, 'i love ponies'); -- this is magic!\n" "INSERT INTO i_love_ponies (id, special_thing) VALUES (2, 'i love django');\n" "UPDATE i_love_ponies SET special_thing = 'Ponies' WHERE special_thing LIKE '%%ponies';" "UPDATE i_love_ponies SET special_thing = 'Django' WHERE special_thing LIKE '%django';", # Run delete queries to test for parameter substitution failure # reported in #23426 "DELETE FROM i_love_ponies WHERE special_thing LIKE '%Django%';" "DELETE FROM i_love_ponies WHERE special_thing LIKE '%%Ponies%%';" "DROP TABLE i_love_ponies", state_operations=[migrations.CreateModel("SomethingElse", [("id", models.AutoField(primary_key=True))])], ) self.assertEqual(operation.describe(), "Raw SQL operation") # Test the state alteration new_state = project_state.clone() operation.state_forwards("test_runsql", new_state) self.assertEqual(len(new_state.models["test_runsql", "somethingelse"].fields), 1) # Make sure there's no table self.assertTableNotExists("i_love_ponies") # Test SQL collection with connection.schema_editor(collect_sql=True) as editor: operation.database_forwards("test_runsql", editor, project_state, new_state) self.assertIn("LIKE '%%ponies';", "\n".join(editor.collected_sql)) operation.database_backwards("test_runsql", editor, project_state, new_state) self.assertIn("LIKE '%%Ponies%%';", "\n".join(editor.collected_sql)) # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_runsql", editor, project_state, new_state) self.assertTableExists("i_love_ponies") # Make sure all the SQL was processed with connection.cursor() as cursor: cursor.execute("SELECT COUNT(*) FROM i_love_ponies") self.assertEqual(cursor.fetchall()[0][0], 2) cursor.execute("SELECT COUNT(*) FROM i_love_ponies WHERE special_thing = 'Django'") self.assertEqual(cursor.fetchall()[0][0], 1) cursor.execute("SELECT COUNT(*) FROM i_love_ponies WHERE special_thing = 'Ponies'") self.assertEqual(cursor.fetchall()[0][0], 1) # And test reversal self.assertTrue(operation.reversible) with connection.schema_editor() as editor: operation.database_backwards("test_runsql", editor, new_state, project_state) self.assertTableNotExists("i_love_ponies") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RunSQL") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["reverse_sql", "sql", "state_operations"]) # And elidable reduction self.assertIs(False, operation.reduce(operation, [])) elidable_operation = migrations.RunSQL('SELECT 1 FROM void;', elidable=True) self.assertEqual(elidable_operation.reduce(operation, []), [operation]) def test_run_sql_params(self): """ #23426 - RunSQL should accept parameters. """ project_state = self.set_up_test_model("test_runsql") # Create the operation operation = migrations.RunSQL( ["CREATE TABLE i_love_ponies (id int, special_thing varchar(15));"], ["DROP TABLE i_love_ponies"], ) param_operation = migrations.RunSQL( # forwards ( "INSERT INTO i_love_ponies (id, special_thing) VALUES (1, 'Django');", ["INSERT INTO i_love_ponies (id, special_thing) VALUES (2, %s);", ['Ponies']], ("INSERT INTO i_love_ponies (id, special_thing) VALUES (%s, %s);", (3, 'Python',)), ), # backwards [ "DELETE FROM i_love_ponies WHERE special_thing = 'Django';", ["DELETE FROM i_love_ponies WHERE special_thing = 'Ponies';", None], ("DELETE FROM i_love_ponies WHERE id = %s OR special_thing = %s;", [3, 'Python']), ] ) # Make sure there's no table self.assertTableNotExists("i_love_ponies") new_state = project_state.clone() # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_runsql", editor, project_state, new_state) # Test parameter passing with connection.schema_editor() as editor: param_operation.database_forwards("test_runsql", editor, project_state, new_state) # Make sure all the SQL was processed with connection.cursor() as cursor: cursor.execute("SELECT COUNT(*) FROM i_love_ponies") self.assertEqual(cursor.fetchall()[0][0], 3) with connection.schema_editor() as editor: param_operation.database_backwards("test_runsql", editor, new_state, project_state) with connection.cursor() as cursor: cursor.execute("SELECT COUNT(*) FROM i_love_ponies") self.assertEqual(cursor.fetchall()[0][0], 0) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_runsql", editor, new_state, project_state) self.assertTableNotExists("i_love_ponies") def test_run_sql_params_invalid(self): """ #23426 - RunSQL should fail when a list of statements with an incorrect number of tuples is given. """ project_state = self.set_up_test_model("test_runsql") new_state = project_state.clone() operation = migrations.RunSQL( # forwards [ ["INSERT INTO foo (bar) VALUES ('buz');"] ], # backwards ( ("DELETE FROM foo WHERE bar = 'buz';", 'invalid', 'parameter count'), ), ) with connection.schema_editor() as editor: with self.assertRaisesMessage(ValueError, "Expected a 2-tuple but got 1"): operation.database_forwards("test_runsql", editor, project_state, new_state) with connection.schema_editor() as editor: with self.assertRaisesMessage(ValueError, "Expected a 2-tuple but got 3"): operation.database_backwards("test_runsql", editor, new_state, project_state) def test_run_sql_noop(self): """ #24098 - Tests no-op RunSQL operations. """ operation = migrations.RunSQL(migrations.RunSQL.noop, migrations.RunSQL.noop) with connection.schema_editor() as editor: operation.database_forwards("test_runsql", editor, None, None) operation.database_backwards("test_runsql", editor, None, None) def test_run_sql_add_missing_semicolon_on_collect_sql(self): project_state = self.set_up_test_model('test_runsql') new_state = project_state.clone() tests = [ 'INSERT INTO test_runsql_pony (pink, weight) VALUES (1, 1);\n', 'INSERT INTO test_runsql_pony (pink, weight) VALUES (1, 1)\n', ] for sql in tests: with self.subTest(sql=sql): operation = migrations.RunSQL(sql, migrations.RunPython.noop) with connection.schema_editor(collect_sql=True) as editor: operation.database_forwards('test_runsql', editor, project_state, new_state) collected_sql = '\n'.join(editor.collected_sql) self.assertEqual(collected_sql.count(';'), 1) def test_run_python(self): """ Tests the RunPython operation """ project_state = self.set_up_test_model("test_runpython", mti_model=True) # Create the operation def inner_method(models, schema_editor): Pony = models.get_model("test_runpython", "Pony") Pony.objects.create(pink=1, weight=3.55) Pony.objects.create(weight=5) def inner_method_reverse(models, schema_editor): Pony = models.get_model("test_runpython", "Pony") Pony.objects.filter(pink=1, weight=3.55).delete() Pony.objects.filter(weight=5).delete() operation = migrations.RunPython(inner_method, reverse_code=inner_method_reverse) self.assertEqual(operation.describe(), "Raw Python operation") # Test the state alteration does nothing new_state = project_state.clone() operation.state_forwards("test_runpython", new_state) self.assertEqual(new_state, project_state) # Test the database alteration self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 0) with connection.schema_editor() as editor: operation.database_forwards("test_runpython", editor, project_state, new_state) self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 2) # Now test reversal self.assertTrue(operation.reversible) with connection.schema_editor() as editor: operation.database_backwards("test_runpython", editor, project_state, new_state) self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 0) # Now test we can't use a string with self.assertRaisesMessage(ValueError, 'RunPython must be supplied with a callable'): migrations.RunPython("print 'ahahaha'") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RunPython") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["code", "reverse_code"]) # Also test reversal fails, with an operation identical to above but without reverse_code set no_reverse_operation = migrations.RunPython(inner_method) self.assertFalse(no_reverse_operation.reversible) with connection.schema_editor() as editor: no_reverse_operation.database_forwards("test_runpython", editor, project_state, new_state) with self.assertRaises(NotImplementedError): no_reverse_operation.database_backwards("test_runpython", editor, new_state, project_state) self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 2) def create_ponies(models, schema_editor): Pony = models.get_model("test_runpython", "Pony") pony1 = Pony.objects.create(pink=1, weight=3.55) self.assertIsNot(pony1.pk, None) pony2 = Pony.objects.create(weight=5) self.assertIsNot(pony2.pk, None) self.assertNotEqual(pony1.pk, pony2.pk) operation = migrations.RunPython(create_ponies) with connection.schema_editor() as editor: operation.database_forwards("test_runpython", editor, project_state, new_state) self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 4) # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "RunPython") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["code"]) def create_shetlandponies(models, schema_editor): ShetlandPony = models.get_model("test_runpython", "ShetlandPony") pony1 = ShetlandPony.objects.create(weight=4.0) self.assertIsNot(pony1.pk, None) pony2 = ShetlandPony.objects.create(weight=5.0) self.assertIsNot(pony2.pk, None) self.assertNotEqual(pony1.pk, pony2.pk) operation = migrations.RunPython(create_shetlandponies) with connection.schema_editor() as editor: operation.database_forwards("test_runpython", editor, project_state, new_state) self.assertEqual(project_state.apps.get_model("test_runpython", "Pony").objects.count(), 6) self.assertEqual(project_state.apps.get_model("test_runpython", "ShetlandPony").objects.count(), 2) # And elidable reduction self.assertIs(False, operation.reduce(operation, [])) elidable_operation = migrations.RunPython(inner_method, elidable=True) self.assertEqual(elidable_operation.reduce(operation, []), [operation]) def test_run_python_atomic(self): """ Tests the RunPython operation correctly handles the "atomic" keyword """ project_state = self.set_up_test_model("test_runpythonatomic", mti_model=True) def inner_method(models, schema_editor): Pony = models.get_model("test_runpythonatomic", "Pony") Pony.objects.create(pink=1, weight=3.55) raise ValueError("Adrian hates ponies.") # Verify atomicity when applying. atomic_migration = Migration("test", "test_runpythonatomic") atomic_migration.operations = [migrations.RunPython(inner_method, reverse_code=inner_method)] non_atomic_migration = Migration("test", "test_runpythonatomic") non_atomic_migration.operations = [migrations.RunPython(inner_method, reverse_code=inner_method, atomic=False)] # If we're a fully-transactional database, both versions should rollback if connection.features.can_rollback_ddl: self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: atomic_migration.apply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: non_atomic_migration.apply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) # Otherwise, the non-atomic operation should leave a row there else: self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: atomic_migration.apply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: non_atomic_migration.apply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 1) # Reset object count to zero and verify atomicity when unapplying. project_state.apps.get_model("test_runpythonatomic", "Pony").objects.all().delete() # On a fully-transactional database, both versions rollback. if connection.features.can_rollback_ddl: self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: atomic_migration.unapply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: non_atomic_migration.unapply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) # Otherwise, the non-atomic operation leaves a row there. else: self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: atomic_migration.unapply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 0) with self.assertRaises(ValueError): with connection.schema_editor() as editor: non_atomic_migration.unapply(project_state, editor) self.assertEqual(project_state.apps.get_model("test_runpythonatomic", "Pony").objects.count(), 1) # Verify deconstruction. definition = non_atomic_migration.operations[0].deconstruct() self.assertEqual(definition[0], "RunPython") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["atomic", "code", "reverse_code"]) def test_run_python_related_assignment(self): """ #24282 - Model changes to a FK reverse side update the model on the FK side as well. """ def inner_method(models, schema_editor): Author = models.get_model("test_authors", "Author") Book = models.get_model("test_books", "Book") author = Author.objects.create(name="Hemingway") Book.objects.create(title="Old Man and The Sea", author=author) create_author = migrations.CreateModel( "Author", [ ("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=100)), ], options={}, ) create_book = migrations.CreateModel( "Book", [ ("id", models.AutoField(primary_key=True)), ("title", models.CharField(max_length=100)), ("author", models.ForeignKey("test_authors.Author", models.CASCADE)) ], options={}, ) add_hometown = migrations.AddField( "Author", "hometown", models.CharField(max_length=100), ) create_old_man = migrations.RunPython(inner_method, inner_method) project_state = ProjectState() new_state = project_state.clone() with connection.schema_editor() as editor: create_author.state_forwards("test_authors", new_state) create_author.database_forwards("test_authors", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: create_book.state_forwards("test_books", new_state) create_book.database_forwards("test_books", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: add_hometown.state_forwards("test_authors", new_state) add_hometown.database_forwards("test_authors", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: create_old_man.state_forwards("test_books", new_state) create_old_man.database_forwards("test_books", editor, project_state, new_state) def test_model_with_bigautofield(self): """ A model with BigAutoField can be created. """ def create_data(models, schema_editor): Author = models.get_model("test_author", "Author") Book = models.get_model("test_book", "Book") author1 = Author.objects.create(name="Hemingway") Book.objects.create(title="Old Man and The Sea", author=author1) Book.objects.create(id=2 ** 33, title="A farewell to arms", author=author1) author2 = Author.objects.create(id=2 ** 33, name="Remarque") Book.objects.create(title="All quiet on the western front", author=author2) Book.objects.create(title="Arc de Triomphe", author=author2) create_author = migrations.CreateModel( "Author", [ ("id", models.BigAutoField(primary_key=True)), ("name", models.CharField(max_length=100)), ], options={}, ) create_book = migrations.CreateModel( "Book", [ ("id", models.BigAutoField(primary_key=True)), ("title", models.CharField(max_length=100)), ("author", models.ForeignKey(to="test_author.Author", on_delete=models.CASCADE)) ], options={}, ) fill_data = migrations.RunPython(create_data) project_state = ProjectState() new_state = project_state.clone() with connection.schema_editor() as editor: create_author.state_forwards("test_author", new_state) create_author.database_forwards("test_author", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: create_book.state_forwards("test_book", new_state) create_book.database_forwards("test_book", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: fill_data.state_forwards("fill_data", new_state) fill_data.database_forwards("fill_data", editor, project_state, new_state) def _test_autofield_foreignfield_growth(self, source_field, target_field, target_value): """ A field may be migrated in the following ways: - AutoField to BigAutoField - SmallAutoField to AutoField - SmallAutoField to BigAutoField """ def create_initial_data(models, schema_editor): Article = models.get_model("test_article", "Article") Blog = models.get_model("test_blog", "Blog") blog = Blog.objects.create(name="web development done right") Article.objects.create(name="Frameworks", blog=blog) Article.objects.create(name="Programming Languages", blog=blog) def create_big_data(models, schema_editor): Article = models.get_model("test_article", "Article") Blog = models.get_model("test_blog", "Blog") blog2 = Blog.objects.create(name="Frameworks", id=target_value) Article.objects.create(name="Django", blog=blog2) Article.objects.create(id=target_value, name="Django2", blog=blog2) create_blog = migrations.CreateModel( "Blog", [ ("id", source_field(primary_key=True)), ("name", models.CharField(max_length=100)), ], options={}, ) create_article = migrations.CreateModel( "Article", [ ("id", source_field(primary_key=True)), ("blog", models.ForeignKey(to="test_blog.Blog", on_delete=models.CASCADE)), ("name", models.CharField(max_length=100)), ("data", models.TextField(default="")), ], options={}, ) fill_initial_data = migrations.RunPython(create_initial_data, create_initial_data) fill_big_data = migrations.RunPython(create_big_data, create_big_data) grow_article_id = migrations.AlterField('Article', 'id', target_field(primary_key=True)) grow_blog_id = migrations.AlterField('Blog', 'id', target_field(primary_key=True)) project_state = ProjectState() new_state = project_state.clone() with connection.schema_editor() as editor: create_blog.state_forwards("test_blog", new_state) create_blog.database_forwards("test_blog", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: create_article.state_forwards("test_article", new_state) create_article.database_forwards("test_article", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: fill_initial_data.state_forwards("fill_initial_data", new_state) fill_initial_data.database_forwards("fill_initial_data", editor, project_state, new_state) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: grow_article_id.state_forwards("test_article", new_state) grow_article_id.database_forwards("test_article", editor, project_state, new_state) state = new_state.clone() article = state.apps.get_model("test_article.Article") self.assertIsInstance(article._meta.pk, target_field) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: grow_blog_id.state_forwards("test_blog", new_state) grow_blog_id.database_forwards("test_blog", editor, project_state, new_state) state = new_state.clone() blog = state.apps.get_model("test_blog.Blog") self.assertIsInstance(blog._meta.pk, target_field) project_state = new_state new_state = new_state.clone() with connection.schema_editor() as editor: fill_big_data.state_forwards("fill_big_data", new_state) fill_big_data.database_forwards("fill_big_data", editor, project_state, new_state) def test_autofield__bigautofield_foreignfield_growth(self): """A field may be migrated from AutoField to BigAutoField.""" self._test_autofield_foreignfield_growth( models.AutoField, models.BigAutoField, 2 ** 33, ) def test_smallfield_autofield_foreignfield_growth(self): """A field may be migrated from SmallAutoField to AutoField.""" self._test_autofield_foreignfield_growth( models.SmallAutoField, models.AutoField, 2 ** 22, ) def test_smallfield_bigautofield_foreignfield_growth(self): """A field may be migrated from SmallAutoField to BigAutoField.""" self._test_autofield_foreignfield_growth( models.SmallAutoField, models.BigAutoField, 2 ** 33, ) def test_run_python_noop(self): """ #24098 - Tests no-op RunPython operations. """ project_state = ProjectState() new_state = project_state.clone() operation = migrations.RunPython(migrations.RunPython.noop, migrations.RunPython.noop) with connection.schema_editor() as editor: operation.database_forwards("test_runpython", editor, project_state, new_state) operation.database_backwards("test_runpython", editor, new_state, project_state) def test_separate_database_and_state(self): """ Tests the SeparateDatabaseAndState operation. """ project_state = self.set_up_test_model("test_separatedatabaseandstate") # Create the operation database_operation = migrations.RunSQL( "CREATE TABLE i_love_ponies (id int, special_thing int);", "DROP TABLE i_love_ponies;" ) state_operation = migrations.CreateModel("SomethingElse", [("id", models.AutoField(primary_key=True))]) operation = migrations.SeparateDatabaseAndState( state_operations=[state_operation], database_operations=[database_operation] ) self.assertEqual(operation.describe(), "Custom state/database change combination") # Test the state alteration new_state = project_state.clone() operation.state_forwards("test_separatedatabaseandstate", new_state) self.assertEqual(len(new_state.models["test_separatedatabaseandstate", "somethingelse"].fields), 1) # Make sure there's no table self.assertTableNotExists("i_love_ponies") # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_separatedatabaseandstate", editor, project_state, new_state) self.assertTableExists("i_love_ponies") # And test reversal self.assertTrue(operation.reversible) with connection.schema_editor() as editor: operation.database_backwards("test_separatedatabaseandstate", editor, new_state, project_state) self.assertTableNotExists("i_love_ponies") # And deconstruction definition = operation.deconstruct() self.assertEqual(definition[0], "SeparateDatabaseAndState") self.assertEqual(definition[1], []) self.assertEqual(sorted(definition[2]), ["database_operations", "state_operations"]) def test_separate_database_and_state2(self): """ A complex SeparateDatabaseAndState operation: Multiple operations both for state and database. Verify the state dependencies within each list and that state ops don't affect the database. """ app_label = "test_separatedatabaseandstate2" project_state = self.set_up_test_model(app_label) # Create the operation database_operations = [ migrations.CreateModel( "ILovePonies", [("id", models.AutoField(primary_key=True))], options={"db_table": "iloveponies"}, ), migrations.CreateModel( "ILoveMorePonies", # We use IntegerField and not AutoField because # the model is going to be deleted immediately # and with an AutoField this fails on Oracle [("id", models.IntegerField(primary_key=True))], options={"db_table": "ilovemoreponies"}, ), migrations.DeleteModel("ILoveMorePonies"), migrations.CreateModel( "ILoveEvenMorePonies", [("id", models.AutoField(primary_key=True))], options={"db_table": "iloveevenmoreponies"}, ), ] state_operations = [ migrations.CreateModel( "SomethingElse", [("id", models.AutoField(primary_key=True))], options={"db_table": "somethingelse"}, ), migrations.DeleteModel("SomethingElse"), migrations.CreateModel( "SomethingCompletelyDifferent", [("id", models.AutoField(primary_key=True))], options={"db_table": "somethingcompletelydifferent"}, ), ] operation = migrations.SeparateDatabaseAndState( state_operations=state_operations, database_operations=database_operations, ) # Test the state alteration new_state = project_state.clone() operation.state_forwards(app_label, new_state) def assertModelsAndTables(after_db): # Tables and models exist, or don't, as they should: self.assertNotIn((app_label, "somethingelse"), new_state.models) self.assertEqual(len(new_state.models[app_label, "somethingcompletelydifferent"].fields), 1) self.assertNotIn((app_label, "iloveponiesonies"), new_state.models) self.assertNotIn((app_label, "ilovemoreponies"), new_state.models) self.assertNotIn((app_label, "iloveevenmoreponies"), new_state.models) self.assertTableNotExists("somethingelse") self.assertTableNotExists("somethingcompletelydifferent") self.assertTableNotExists("ilovemoreponies") if after_db: self.assertTableExists("iloveponies") self.assertTableExists("iloveevenmoreponies") else: self.assertTableNotExists("iloveponies") self.assertTableNotExists("iloveevenmoreponies") assertModelsAndTables(after_db=False) # Test the database alteration with connection.schema_editor() as editor: operation.database_forwards(app_label, editor, project_state, new_state) assertModelsAndTables(after_db=True) # And test reversal self.assertTrue(operation.reversible) with connection.schema_editor() as editor: operation.database_backwards(app_label, editor, new_state, project_state) assertModelsAndTables(after_db=False) class SwappableOperationTests(OperationTestBase): """ Key operations ignore swappable models (we don't want to replicate all of them here, as the functionality is in a common base class anyway) """ available_apps = ['migrations'] @override_settings(TEST_SWAP_MODEL="migrations.SomeFakeModel") def test_create_ignore_swapped(self): """ The CreateTable operation ignores swapped models. """ operation = migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.IntegerField(default=1)), ], options={ "swappable": "TEST_SWAP_MODEL", }, ) # Test the state alteration (it should still be there!) project_state = ProjectState() new_state = project_state.clone() operation.state_forwards("test_crigsw", new_state) self.assertEqual(new_state.models["test_crigsw", "pony"].name, "Pony") self.assertEqual(len(new_state.models["test_crigsw", "pony"].fields), 2) # Test the database alteration self.assertTableNotExists("test_crigsw_pony") with connection.schema_editor() as editor: operation.database_forwards("test_crigsw", editor, project_state, new_state) self.assertTableNotExists("test_crigsw_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_crigsw", editor, new_state, project_state) self.assertTableNotExists("test_crigsw_pony") @override_settings(TEST_SWAP_MODEL="migrations.SomeFakeModel") def test_delete_ignore_swapped(self): """ Tests the DeleteModel operation ignores swapped models. """ operation = migrations.DeleteModel("Pony") project_state, new_state = self.make_test_state("test_dligsw", operation) # Test the database alteration self.assertTableNotExists("test_dligsw_pony") with connection.schema_editor() as editor: operation.database_forwards("test_dligsw", editor, project_state, new_state) self.assertTableNotExists("test_dligsw_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_dligsw", editor, new_state, project_state) self.assertTableNotExists("test_dligsw_pony") @override_settings(TEST_SWAP_MODEL="migrations.SomeFakeModel") def test_add_field_ignore_swapped(self): """ Tests the AddField operation. """ # Test the state alteration operation = migrations.AddField( "Pony", "height", models.FloatField(null=True, default=5), ) project_state, new_state = self.make_test_state("test_adfligsw", operation) # Test the database alteration self.assertTableNotExists("test_adfligsw_pony") with connection.schema_editor() as editor: operation.database_forwards("test_adfligsw", editor, project_state, new_state) self.assertTableNotExists("test_adfligsw_pony") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_adfligsw", editor, new_state, project_state) self.assertTableNotExists("test_adfligsw_pony") @override_settings(TEST_SWAP_MODEL='migrations.SomeFakeModel') def test_indexes_ignore_swapped(self): """ Add/RemoveIndex operations ignore swapped models. """ operation = migrations.AddIndex('Pony', models.Index(fields=['pink'], name='my_name_idx')) project_state, new_state = self.make_test_state('test_adinigsw', operation) with connection.schema_editor() as editor: # No database queries should be run for swapped models operation.database_forwards('test_adinigsw', editor, project_state, new_state) operation.database_backwards('test_adinigsw', editor, new_state, project_state) operation = migrations.RemoveIndex('Pony', models.Index(fields=['pink'], name='my_name_idx')) project_state, new_state = self.make_test_state("test_rminigsw", operation) with connection.schema_editor() as editor: operation.database_forwards('test_rminigsw', editor, project_state, new_state) operation.database_backwards('test_rminigsw', editor, new_state, project_state) class TestCreateModel(SimpleTestCase): def test_references_model_mixin(self): migrations.CreateModel( 'name', fields=[], bases=(Mixin, models.Model), ).references_model('other_model', 'migrations') class FieldOperationTests(SimpleTestCase): def test_references_model(self): operation = FieldOperation('MoDel', 'field', models.ForeignKey('Other', models.CASCADE)) # Model name match. self.assertIs(operation.references_model('mOdEl', 'migrations'), True) # Referenced field. self.assertIs(operation.references_model('oTher', 'migrations'), True) # Doesn't reference. self.assertIs(operation.references_model('Whatever', 'migrations'), False) def test_references_field_by_name(self): operation = FieldOperation('MoDel', 'field', models.BooleanField(default=False)) self.assertIs(operation.references_field('model', 'field', 'migrations'), True) def test_references_field_by_remote_field_model(self): operation = FieldOperation('Model', 'field', models.ForeignKey('Other', models.CASCADE)) self.assertIs(operation.references_field('Other', 'whatever', 'migrations'), True) self.assertIs(operation.references_field('Missing', 'whatever', 'migrations'), False) def test_references_field_by_from_fields(self): operation = FieldOperation( 'Model', 'field', models.fields.related.ForeignObject('Other', models.CASCADE, ['from'], ['to']) ) self.assertIs(operation.references_field('Model', 'from', 'migrations'), True) self.assertIs(operation.references_field('Model', 'to', 'migrations'), False) self.assertIs(operation.references_field('Other', 'from', 'migrations'), False) self.assertIs(operation.references_field('Model', 'to', 'migrations'), False) def test_references_field_by_to_fields(self): operation = FieldOperation('Model', 'field', models.ForeignKey('Other', models.CASCADE, to_field='field')) self.assertIs(operation.references_field('Other', 'field', 'migrations'), True) self.assertIs(operation.references_field('Other', 'whatever', 'migrations'), False) self.assertIs(operation.references_field('Missing', 'whatever', 'migrations'), False) def test_references_field_by_through(self): operation = FieldOperation('Model', 'field', models.ManyToManyField('Other', through='Through')) self.assertIs(operation.references_field('Other', 'whatever', 'migrations'), True) self.assertIs(operation.references_field('Through', 'whatever', 'migrations'), True) self.assertIs(operation.references_field('Missing', 'whatever', 'migrations'), False) def test_reference_field_by_through_fields(self): operation = FieldOperation( 'Model', 'field', models.ManyToManyField('Other', through='Through', through_fields=('first', 'second')) ) self.assertIs(operation.references_field('Other', 'whatever', 'migrations'), True) self.assertIs(operation.references_field('Through', 'whatever', 'migrations'), False) self.assertIs(operation.references_field('Through', 'first', 'migrations'), True) self.assertIs(operation.references_field('Through', 'second', 'migrations'), True)