django/tests/migrations/test_operations.py

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from django.test import TestCase
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from django.db import connection, models, migrations
from django.db.transaction import atomic
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from django.db.utils import IntegrityError
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from django.db.migrations.state import ProjectState
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class OperationTests(TestCase):
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"""
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 assertTableExists(self, table):
self.assertIn(table, connection.introspection.get_table_list(connection.cursor()))
def assertTableNotExists(self, table):
self.assertNotIn(table, connection.introspection.get_table_list(connection.cursor()))
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def assertColumnExists(self, table, column):
self.assertIn(column, [c.name for c in connection.introspection.get_table_description(connection.cursor(), table)])
def assertColumnNotExists(self, table, column):
self.assertNotIn(column, [c.name for c in connection.introspection.get_table_description(connection.cursor(), table)])
def assertColumnNull(self, table, column):
self.assertEqual([c.null_ok for c in connection.introspection.get_table_description(connection.cursor(), table) if c.name == column][0], True)
def assertColumnNotNull(self, table, column):
self.assertEqual([c.null_ok for c in connection.introspection.get_table_description(connection.cursor(), table) if c.name == column][0], False)
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def assertIndexExists(self, table, columns, value=True):
self.assertEqual(
value,
any(
c["index"]
for c in connection.introspection.get_constraints(connection.cursor(), table).values()
if c['columns'] == list(columns)
),
)
def assertIndexNotExists(self, table, columns):
return self.assertIndexExists(table, columns, False)
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def set_up_test_model(self, app_label):
"""
Creates a test model state and database table.
"""
# Make the "current" state
creation = migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.IntegerField(default=3)),
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("weight", models.FloatField()),
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],
)
project_state = ProjectState()
creation.state_forwards(app_label, project_state)
# Set up the database
with connection.schema_editor() as editor:
creation.database_forwards(app_label, editor, ProjectState(), project_state)
return project_state
def test_create_model(self):
"""
Tests the CreateModel operation.
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Most other tests use this operation as part of setup, so check failures here first.
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"""
operation = migrations.CreateModel(
"Pony",
[
("id", models.AutoField(primary_key=True)),
("pink", models.IntegerField(default=1)),
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],
)
# Test the state alteration
project_state = ProjectState()
new_state = project_state.clone()
operation.state_forwards("test_crmo", new_state)
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self.assertEqual(new_state.models["test_crmo", "pony"].name, "pony")
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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(len(definition[1]), 2)
self.assertEqual(len(definition[2]), 0)
self.assertEqual(definition[1][0], "Pony")
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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")
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")
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def test_add_field(self):
"""
Tests the AddField operation.
"""
project_state = self.set_up_test_model("test_adfl")
# Test the state alteration
operation = migrations.AddField("Pony", "height", models.FloatField(null=True))
new_state = project_state.clone()
operation.state_forwards("test_adfl", new_state)
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self.assertEqual(len(new_state.models["test_adfl", "pony"].fields), 4)
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# 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")
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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")
new_state = project_state.clone()
operation.state_forwards("test_rmfl", new_state)
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self.assertEqual(len(new_state.models["test_rmfl", "pony"].fields), 2)
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# 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")
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")
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")
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))
new_state = project_state.clone()
operation.state_forwards("test_alfl", new_state)
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self.assertEqual(project_state.models["test_alfl", "pony"].get_field_by_name("pink").null, False)
self.assertEqual(new_state.models["test_alfl", "pony"].get_field_by_name("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")
def test_rename_field(self):
"""
Tests the RenameField operation.
"""
project_state = self.set_up_test_model("test_rnfl")
# Test the state alteration
operation = migrations.RenameField("Pony", "pink", "blue")
new_state = project_state.clone()
operation.state_forwards("test_rnfl", new_state)
self.assertIn("blue", [n for n, f in new_state.models["test_rnfl", "pony"].fields])
self.assertNotIn("pink", [n for n, f in new_state.models["test_rnfl", "pony"].fields])
# 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")
# 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")
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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")])
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
cursor = connection.cursor()
cursor.execute("INSERT INTO test_alunto_pony (id, pink, weight) VALUES (1, 1, 1)")
cursor.execute("INSERT INTO test_alunto_pony (id, pink, weight) VALUES (2, 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 (id, pink, weight) VALUES (1, 1, 1)")
with self.assertRaises(IntegrityError):
with atomic():
cursor.execute("INSERT INTO test_alunto_pony (id, pink, weight) VALUES (2, 1, 1)")
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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 (id, pink, weight) VALUES (1, 1, 1)")
cursor.execute("INSERT INTO test_alunto_pony (id, pink, weight) VALUES (2, 1, 1)")
cursor.execute("DELETE FROM test_alunto_pony")
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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")])
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"])