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771 lines
32 KiB
Python
771 lines
32 KiB
Python
from django.apps.registry import apps as global_apps
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from django.db import connection
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from django.db.migrations.exceptions import InvalidMigrationPlan
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from django.db.migrations.executor import MigrationExecutor
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from django.db.migrations.graph import MigrationGraph
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from django.db.migrations.recorder import MigrationRecorder
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from django.db.utils import DatabaseError
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from django.test import TestCase, modify_settings, override_settings
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from .test_base import MigrationTestBase
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@modify_settings(INSTALLED_APPS={'append': 'migrations2'})
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class ExecutorTests(MigrationTestBase):
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"""
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Tests the migration executor (full end-to-end running).
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Bear in mind that if these are failing you should fix the other
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test failures first, as they may be propagating into here.
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"""
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available_apps = ["migrations", "migrations2", "django.contrib.auth", "django.contrib.contenttypes"]
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
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def test_run(self):
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"""
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Tests running a simple set of migrations.
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"""
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executor = MigrationExecutor(connection)
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# Let's look at the plan first and make sure it's up to scratch
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plan = executor.migration_plan([("migrations", "0002_second")])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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(executor.loader.graph.nodes["migrations", "0002_second"], False),
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],
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)
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# Were the tables there before?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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# Alright, let's try running it
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executor.migrate([("migrations", "0002_second")])
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# Are the tables there now?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_book")
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Alright, let's undo what we did
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plan = executor.migration_plan([("migrations", None)])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0002_second"], True),
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(executor.loader.graph.nodes["migrations", "0001_initial"], True),
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],
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)
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executor.migrate([("migrations", None)])
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# Are the tables gone?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
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def test_run_with_squashed(self):
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"""
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Tests running a squashed migration from zero (should ignore what it replaces)
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"""
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executor = MigrationExecutor(connection)
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# Check our leaf node is the squashed one
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leaves = [key for key in executor.loader.graph.leaf_nodes() if key[0] == "migrations"]
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self.assertEqual(leaves, [("migrations", "0001_squashed_0002")])
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# Check the plan
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plan = executor.migration_plan([("migrations", "0001_squashed_0002")])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_squashed_0002"], False),
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],
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)
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# Were the tables there before?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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# Alright, let's try running it
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executor.migrate([("migrations", "0001_squashed_0002")])
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# Are the tables there now?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_book")
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Alright, let's undo what we did. Should also just use squashed.
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plan = executor.migration_plan([("migrations", None)])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_squashed_0002"], True),
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],
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)
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executor.migrate([("migrations", None)])
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# Are the tables gone?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_non_atomic"})
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def test_non_atomic_migration(self):
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"""
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Applying a non-atomic migration works as expected.
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"""
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executor = MigrationExecutor(connection)
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with self.assertRaisesMessage(RuntimeError, "Abort migration"):
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executor.migrate([("migrations", "0001_initial")])
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self.assertTableExists("migrations_publisher")
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migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).apps
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Publisher = migrations_apps.get_model("migrations", "Publisher")
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self.assertTrue(Publisher.objects.exists())
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self.assertTableNotExists("migrations_book")
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_atomic_operation"})
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def test_atomic_operation_in_non_atomic_migration(self):
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"""
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An atomic operation is properly rolled back inside a non-atomic
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migration.
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"""
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executor = MigrationExecutor(connection)
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with self.assertRaisesMessage(RuntimeError, "Abort migration"):
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executor.migrate([("migrations", "0001_initial")])
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migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).apps
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Editor = migrations_apps.get_model("migrations", "Editor")
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self.assertFalse(Editor.objects.exists())
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@override_settings(MIGRATION_MODULES={
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"migrations": "migrations.test_migrations",
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"migrations2": "migrations2.test_migrations_2",
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})
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def test_empty_plan(self):
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"""
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Re-planning a full migration of a fully-migrated set doesn't
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perform spurious unmigrations and remigrations.
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There was previously a bug where the executor just always performed the
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backwards plan for applied migrations - which even for the most recent
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migration in an app, might include other, dependent apps, and these
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were being unmigrated.
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"""
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# Make the initial plan, check it
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executor = MigrationExecutor(connection)
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plan = executor.migration_plan([
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("migrations", "0002_second"),
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("migrations2", "0001_initial"),
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])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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(executor.loader.graph.nodes["migrations", "0002_second"], False),
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(executor.loader.graph.nodes["migrations2", "0001_initial"], False),
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],
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)
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# Fake-apply all migrations
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executor.migrate([
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("migrations", "0002_second"),
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("migrations2", "0001_initial")
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], fake=True)
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Now plan a second time and make sure it's empty
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plan = executor.migration_plan([
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("migrations", "0002_second"),
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("migrations2", "0001_initial"),
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])
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self.assertEqual(plan, [])
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# The resulting state should include applied migrations.
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state = executor.migrate([
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("migrations", "0002_second"),
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("migrations2", "0001_initial"),
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])
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self.assertIn(('migrations', 'book'), state.models)
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self.assertIn(('migrations', 'author'), state.models)
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self.assertIn(('migrations2', 'otherauthor'), state.models)
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# Erase all the fake records
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executor.recorder.record_unapplied("migrations2", "0001_initial")
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executor.recorder.record_unapplied("migrations", "0002_second")
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executor.recorder.record_unapplied("migrations", "0001_initial")
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@override_settings(MIGRATION_MODULES={
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"migrations": "migrations.test_migrations",
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"migrations2": "migrations2.test_migrations_2_no_deps",
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})
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def test_mixed_plan_not_supported(self):
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"""
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Although the MigrationExecutor interfaces allows for mixed migration
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plans (combined forwards and backwards migrations) this is not
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supported.
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"""
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# Prepare for mixed plan
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executor = MigrationExecutor(connection)
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plan = executor.migration_plan([("migrations", "0002_second")])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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(executor.loader.graph.nodes["migrations", "0002_second"], False),
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],
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)
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executor.migrate(None, plan)
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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self.assertIn(('migrations', '0001_initial'), executor.loader.applied_migrations)
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self.assertIn(('migrations', '0002_second'), executor.loader.applied_migrations)
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self.assertNotIn(('migrations2', '0001_initial'), executor.loader.applied_migrations)
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# Generate mixed plan
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plan = executor.migration_plan([
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("migrations", None),
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("migrations2", "0001_initial"),
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])
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msg = (
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'Migration plans with both forwards and backwards migrations are '
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'not supported. Please split your migration process into separate '
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'plans of only forwards OR backwards migrations.'
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)
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with self.assertRaisesMessage(InvalidMigrationPlan, msg) as cm:
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executor.migrate(None, plan)
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self.assertEqual(
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cm.exception.args[1],
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[
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(executor.loader.graph.nodes["migrations", "0002_second"], True),
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(executor.loader.graph.nodes["migrations", "0001_initial"], True),
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(executor.loader.graph.nodes["migrations2", "0001_initial"], False),
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],
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)
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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executor.migrate([
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("migrations", None),
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("migrations2", None),
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])
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# Are the tables gone?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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self.assertTableNotExists("migrations2_otherauthor")
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
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def test_soft_apply(self):
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"""
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Tests detection of initial migrations already having been applied.
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"""
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state = {"faked": None}
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def fake_storer(phase, migration=None, fake=None):
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state["faked"] = fake
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executor = MigrationExecutor(connection, progress_callback=fake_storer)
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# Were the tables there before?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_tribble")
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# Run it normally
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self.assertEqual(
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executor.migration_plan([("migrations", "0001_initial")]),
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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],
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)
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executor.migrate([("migrations", "0001_initial")])
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# Are the tables there now?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_tribble")
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# We shouldn't have faked that one
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self.assertIs(state["faked"], False)
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Fake-reverse that
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executor.migrate([("migrations", None)], fake=True)
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# Are the tables still there?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_tribble")
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# Make sure that was faked
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self.assertIs(state["faked"], True)
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# Finally, migrate forwards; this should fake-apply our initial migration
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executor.loader.build_graph()
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self.assertEqual(
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executor.migration_plan([("migrations", "0001_initial")]),
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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],
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)
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# Applying the migration should raise a database level error
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# because we haven't given the --fake-initial option
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with self.assertRaises(DatabaseError):
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executor.migrate([("migrations", "0001_initial")])
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# Reset the faked state
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state = {"faked": None}
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# Allow faking of initial CreateModel operations
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executor.migrate([("migrations", "0001_initial")], fake_initial=True)
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self.assertIs(state["faked"], True)
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# And migrate back to clean up the database
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executor.loader.build_graph()
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executor.migrate([("migrations", None)])
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_tribble")
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@override_settings(
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MIGRATION_MODULES={
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"migrations": "migrations.test_migrations_custom_user",
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"django.contrib.auth": "django.contrib.auth.migrations",
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},
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AUTH_USER_MODEL="migrations.Author",
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)
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def test_custom_user(self):
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"""
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Regression test for #22325 - references to a custom user model defined in the
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same app are not resolved correctly.
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"""
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executor = MigrationExecutor(connection)
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_tribble")
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# Migrate forwards
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executor.migrate([("migrations", "0001_initial")])
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_tribble")
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# Make sure the soft-application detection works (#23093)
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# Change table_names to not return auth_user during this as
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# it wouldn't be there in a normal run, and ensure migrations.Author
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# exists in the global app registry temporarily.
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old_table_names = connection.introspection.table_names
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connection.introspection.table_names = lambda c: [x for x in old_table_names(c) if x != "auth_user"]
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migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).apps
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global_apps.get_app_config("migrations").models["author"] = migrations_apps.get_model("migrations", "author")
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try:
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migration = executor.loader.get_migration("auth", "0001_initial")
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self.assertIs(executor.detect_soft_applied(None, migration)[0], True)
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finally:
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connection.introspection.table_names = old_table_names
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del global_apps.get_app_config("migrations").models["author"]
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# And migrate back to clean up the database
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executor.loader.build_graph()
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executor.migrate([("migrations", None)])
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_tribble")
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@override_settings(
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MIGRATION_MODULES={
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"migrations": "migrations.test_add_many_to_many_field_initial",
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},
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)
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def test_detect_soft_applied_add_field_manytomanyfield(self):
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"""
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executor.detect_soft_applied() detects ManyToManyField tables from an
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AddField operation. This checks the case of AddField in a migration
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with other operations (0001) and the case of AddField in its own
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migration (0002).
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"""
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tables = [
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# from 0001
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"migrations_project",
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"migrations_task",
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"migrations_project_tasks",
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# from 0002
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"migrations_task_projects",
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]
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executor = MigrationExecutor(connection)
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# Create the tables for 0001 but make it look like the migration hasn't
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# been applied.
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executor.migrate([("migrations", "0001_initial")])
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executor.migrate([("migrations", None)], fake=True)
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for table in tables[:3]:
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self.assertTableExists(table)
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# Table detection sees 0001 is applied but not 0002.
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migration = executor.loader.get_migration("migrations", "0001_initial")
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self.assertIs(executor.detect_soft_applied(None, migration)[0], True)
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migration = executor.loader.get_migration("migrations", "0002_initial")
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self.assertIs(executor.detect_soft_applied(None, migration)[0], False)
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# Create the tables for both migrations but make it look like neither
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# has been applied.
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executor.loader.build_graph()
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executor.migrate([("migrations", "0001_initial")], fake=True)
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executor.migrate([("migrations", "0002_initial")])
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executor.loader.build_graph()
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executor.migrate([("migrations", None)], fake=True)
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# Table detection sees 0002 is applied.
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migration = executor.loader.get_migration("migrations", "0002_initial")
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self.assertIs(executor.detect_soft_applied(None, migration)[0], True)
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# Leave the tables for 0001 except the many-to-many table. That missing
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# table should cause detect_soft_applied() to return False.
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with connection.schema_editor() as editor:
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for table in tables[2:]:
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editor.execute(editor.sql_delete_table % {"table": table})
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migration = executor.loader.get_migration("migrations", "0001_initial")
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self.assertIs(executor.detect_soft_applied(None, migration)[0], False)
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# Cleanup by removing the remaining tables.
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with connection.schema_editor() as editor:
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for table in tables[:2]:
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editor.execute(editor.sql_delete_table % {"table": table})
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for table in tables:
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self.assertTableNotExists(table)
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@override_settings(
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INSTALLED_APPS=[
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"migrations.migrations_test_apps.lookuperror_a",
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"migrations.migrations_test_apps.lookuperror_b",
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"migrations.migrations_test_apps.lookuperror_c"
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]
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)
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def test_unrelated_model_lookups_forwards(self):
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"""
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#24123 - All models of apps already applied which are
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unrelated to the first app being applied are part of the initial model
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state.
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"""
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try:
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executor = MigrationExecutor(connection)
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self.assertTableNotExists("lookuperror_a_a1")
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self.assertTableNotExists("lookuperror_b_b1")
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self.assertTableNotExists("lookuperror_c_c1")
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executor.migrate([("lookuperror_b", "0003_b3")])
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self.assertTableExists("lookuperror_b_b3")
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Migrate forwards -- This led to a lookup LookupErrors because
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# lookuperror_b.B2 is already applied
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executor.migrate([
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("lookuperror_a", "0004_a4"),
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("lookuperror_c", "0003_c3"),
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])
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self.assertTableExists("lookuperror_a_a4")
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self.assertTableExists("lookuperror_c_c3")
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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finally:
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# Cleanup
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executor.migrate([
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("lookuperror_a", None),
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("lookuperror_b", None),
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("lookuperror_c", None),
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])
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self.assertTableNotExists("lookuperror_a_a1")
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self.assertTableNotExists("lookuperror_b_b1")
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self.assertTableNotExists("lookuperror_c_c1")
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@override_settings(
|
|
INSTALLED_APPS=[
|
|
"migrations.migrations_test_apps.lookuperror_a",
|
|
"migrations.migrations_test_apps.lookuperror_b",
|
|
"migrations.migrations_test_apps.lookuperror_c"
|
|
]
|
|
)
|
|
def test_unrelated_model_lookups_backwards(self):
|
|
"""
|
|
#24123 - All models of apps being unapplied which are
|
|
unrelated to the first app being unapplied are part of the initial
|
|
model state.
|
|
"""
|
|
try:
|
|
executor = MigrationExecutor(connection)
|
|
self.assertTableNotExists("lookuperror_a_a1")
|
|
self.assertTableNotExists("lookuperror_b_b1")
|
|
self.assertTableNotExists("lookuperror_c_c1")
|
|
executor.migrate([
|
|
("lookuperror_a", "0004_a4"),
|
|
("lookuperror_b", "0003_b3"),
|
|
("lookuperror_c", "0003_c3"),
|
|
])
|
|
self.assertTableExists("lookuperror_b_b3")
|
|
self.assertTableExists("lookuperror_a_a4")
|
|
self.assertTableExists("lookuperror_c_c3")
|
|
# Rebuild the graph to reflect the new DB state
|
|
executor.loader.build_graph()
|
|
|
|
# Migrate backwards -- This led to a lookup LookupErrors because
|
|
# lookuperror_b.B2 is not in the initial state (unrelated to app c)
|
|
executor.migrate([("lookuperror_a", None)])
|
|
|
|
# Rebuild the graph to reflect the new DB state
|
|
executor.loader.build_graph()
|
|
finally:
|
|
# Cleanup
|
|
executor.migrate([
|
|
("lookuperror_b", None),
|
|
("lookuperror_c", None)
|
|
])
|
|
self.assertTableNotExists("lookuperror_a_a1")
|
|
self.assertTableNotExists("lookuperror_b_b1")
|
|
self.assertTableNotExists("lookuperror_c_c1")
|
|
|
|
@override_settings(
|
|
INSTALLED_APPS=[
|
|
'migrations.migrations_test_apps.mutate_state_a',
|
|
'migrations.migrations_test_apps.mutate_state_b',
|
|
]
|
|
)
|
|
def test_unrelated_applied_migrations_mutate_state(self):
|
|
"""
|
|
#26647 - Unrelated applied migrations should be part of the final
|
|
state in both directions.
|
|
"""
|
|
executor = MigrationExecutor(connection)
|
|
executor.migrate([
|
|
('mutate_state_b', '0002_add_field'),
|
|
])
|
|
# Migrate forward.
|
|
executor.loader.build_graph()
|
|
state = executor.migrate([
|
|
('mutate_state_a', '0001_initial'),
|
|
])
|
|
self.assertIn('added', dict(state.models['mutate_state_b', 'b'].fields))
|
|
executor.loader.build_graph()
|
|
# Migrate backward.
|
|
state = executor.migrate([
|
|
('mutate_state_a', None),
|
|
])
|
|
self.assertIn('added', dict(state.models['mutate_state_b', 'b'].fields))
|
|
executor.migrate([
|
|
('mutate_state_b', None),
|
|
])
|
|
|
|
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
|
|
def test_process_callback(self):
|
|
"""
|
|
#24129 - Tests callback process
|
|
"""
|
|
call_args_list = []
|
|
|
|
def callback(*args):
|
|
call_args_list.append(args)
|
|
|
|
executor = MigrationExecutor(connection, progress_callback=callback)
|
|
# Were the tables there before?
|
|
self.assertTableNotExists("migrations_author")
|
|
self.assertTableNotExists("migrations_tribble")
|
|
executor.migrate([
|
|
("migrations", "0001_initial"),
|
|
("migrations", "0002_second"),
|
|
])
|
|
# Rebuild the graph to reflect the new DB state
|
|
executor.loader.build_graph()
|
|
|
|
executor.migrate([
|
|
("migrations", None),
|
|
("migrations", None),
|
|
])
|
|
self.assertTableNotExists("migrations_author")
|
|
self.assertTableNotExists("migrations_tribble")
|
|
|
|
migrations = executor.loader.graph.nodes
|
|
expected = [
|
|
("render_start", ),
|
|
("render_success", ),
|
|
("apply_start", migrations['migrations', '0001_initial'], False),
|
|
("apply_success", migrations['migrations', '0001_initial'], False),
|
|
("apply_start", migrations['migrations', '0002_second'], False),
|
|
("apply_success", migrations['migrations', '0002_second'], False),
|
|
("render_start", ),
|
|
("render_success", ),
|
|
("unapply_start", migrations['migrations', '0002_second'], False),
|
|
("unapply_success", migrations['migrations', '0002_second'], False),
|
|
("unapply_start", migrations['migrations', '0001_initial'], False),
|
|
("unapply_success", migrations['migrations', '0001_initial'], False),
|
|
]
|
|
self.assertEqual(call_args_list, expected)
|
|
|
|
@override_settings(
|
|
INSTALLED_APPS=[
|
|
"migrations.migrations_test_apps.alter_fk.author_app",
|
|
"migrations.migrations_test_apps.alter_fk.book_app",
|
|
]
|
|
)
|
|
def test_alter_id_type_with_fk(self):
|
|
try:
|
|
executor = MigrationExecutor(connection)
|
|
self.assertTableNotExists("author_app_author")
|
|
self.assertTableNotExists("book_app_book")
|
|
# Apply initial migrations
|
|
executor.migrate([
|
|
("author_app", "0001_initial"),
|
|
("book_app", "0001_initial"),
|
|
])
|
|
self.assertTableExists("author_app_author")
|
|
self.assertTableExists("book_app_book")
|
|
# Rebuild the graph to reflect the new DB state
|
|
executor.loader.build_graph()
|
|
|
|
# Apply PK type alteration
|
|
executor.migrate([("author_app", "0002_alter_id")])
|
|
|
|
# Rebuild the graph to reflect the new DB state
|
|
executor.loader.build_graph()
|
|
finally:
|
|
# We can't simply unapply the migrations here because there is no
|
|
# implicit cast from VARCHAR to INT on the database level.
|
|
with connection.schema_editor() as editor:
|
|
editor.execute(editor.sql_delete_table % {"table": "book_app_book"})
|
|
editor.execute(editor.sql_delete_table % {"table": "author_app_author"})
|
|
self.assertTableNotExists("author_app_author")
|
|
self.assertTableNotExists("book_app_book")
|
|
executor.migrate([("author_app", None)], fake=True)
|
|
|
|
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
|
|
def test_apply_all_replaced_marks_replacement_as_applied(self):
|
|
"""
|
|
Applying all replaced migrations marks replacement as applied (#24628).
|
|
"""
|
|
recorder = MigrationRecorder(connection)
|
|
# Place the database in a state where the replaced migrations are
|
|
# partially applied: 0001 is applied, 0002 is not.
|
|
recorder.record_applied("migrations", "0001_initial")
|
|
executor = MigrationExecutor(connection)
|
|
# Use fake because we don't actually have the first migration
|
|
# applied, so the second will fail. And there's no need to actually
|
|
# create/modify tables here, we're just testing the
|
|
# MigrationRecord, which works the same with or without fake.
|
|
executor.migrate([("migrations", "0002_second")], fake=True)
|
|
|
|
# Because we've now applied 0001 and 0002 both, their squashed
|
|
# replacement should be marked as applied.
|
|
self.assertIn(
|
|
("migrations", "0001_squashed_0002"),
|
|
recorder.applied_migrations(),
|
|
)
|
|
|
|
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
|
|
def test_migrate_marks_replacement_applied_even_if_it_did_nothing(self):
|
|
"""
|
|
A new squash migration will be marked as applied even if all its
|
|
replaced migrations were previously already applied (#24628).
|
|
"""
|
|
recorder = MigrationRecorder(connection)
|
|
# Record all replaced migrations as applied
|
|
recorder.record_applied("migrations", "0001_initial")
|
|
recorder.record_applied("migrations", "0002_second")
|
|
executor = MigrationExecutor(connection)
|
|
executor.migrate([("migrations", "0001_squashed_0002")])
|
|
|
|
# Because 0001 and 0002 are both applied, even though this migrate run
|
|
# didn't apply anything new, their squashed replacement should be
|
|
# marked as applied.
|
|
self.assertIn(
|
|
("migrations", "0001_squashed_0002"),
|
|
recorder.applied_migrations(),
|
|
)
|
|
|
|
|
|
class FakeLoader:
|
|
def __init__(self, graph, applied):
|
|
self.graph = graph
|
|
self.applied_migrations = applied
|
|
|
|
|
|
class FakeMigration:
|
|
"""Really all we need is any object with a debug-useful repr."""
|
|
def __init__(self, name):
|
|
self.name = name
|
|
|
|
def __repr__(self):
|
|
return 'M<%s>' % self.name
|
|
|
|
|
|
class ExecutorUnitTests(TestCase):
|
|
"""(More) isolated unit tests for executor methods."""
|
|
def test_minimize_rollbacks(self):
|
|
"""
|
|
Minimize unnecessary rollbacks in connected apps.
|
|
|
|
When you say "./manage.py migrate appA 0001", rather than migrating to
|
|
just after appA-0001 in the linearized migration plan (which could roll
|
|
back migrations in other apps that depend on appA 0001, but don't need
|
|
to be rolled back since we're not rolling back appA 0001), we migrate
|
|
to just before appA-0002.
|
|
"""
|
|
a1_impl = FakeMigration('a1')
|
|
a1 = ('a', '1')
|
|
a2_impl = FakeMigration('a2')
|
|
a2 = ('a', '2')
|
|
b1_impl = FakeMigration('b1')
|
|
b1 = ('b', '1')
|
|
graph = MigrationGraph()
|
|
graph.add_node(a1, a1_impl)
|
|
graph.add_node(a2, a2_impl)
|
|
graph.add_node(b1, b1_impl)
|
|
graph.add_dependency(None, b1, a1)
|
|
graph.add_dependency(None, a2, a1)
|
|
|
|
executor = MigrationExecutor(None)
|
|
executor.loader = FakeLoader(graph, {a1, b1, a2})
|
|
|
|
plan = executor.migration_plan({a1})
|
|
|
|
self.assertEqual(plan, [(a2_impl, True)])
|
|
|
|
def test_minimize_rollbacks_branchy(self):
|
|
r"""
|
|
Minimize rollbacks when target has multiple in-app children.
|
|
|
|
a: 1 <---- 3 <--\
|
|
\ \- 2 <--- 4
|
|
\ \
|
|
b: \- 1 <--- 2
|
|
"""
|
|
a1_impl = FakeMigration('a1')
|
|
a1 = ('a', '1')
|
|
a2_impl = FakeMigration('a2')
|
|
a2 = ('a', '2')
|
|
a3_impl = FakeMigration('a3')
|
|
a3 = ('a', '3')
|
|
a4_impl = FakeMigration('a4')
|
|
a4 = ('a', '4')
|
|
b1_impl = FakeMigration('b1')
|
|
b1 = ('b', '1')
|
|
b2_impl = FakeMigration('b2')
|
|
b2 = ('b', '2')
|
|
graph = MigrationGraph()
|
|
graph.add_node(a1, a1_impl)
|
|
graph.add_node(a2, a2_impl)
|
|
graph.add_node(a3, a3_impl)
|
|
graph.add_node(a4, a4_impl)
|
|
graph.add_node(b1, b1_impl)
|
|
graph.add_node(b2, b2_impl)
|
|
graph.add_dependency(None, a2, a1)
|
|
graph.add_dependency(None, a3, a1)
|
|
graph.add_dependency(None, a4, a2)
|
|
graph.add_dependency(None, a4, a3)
|
|
graph.add_dependency(None, b2, b1)
|
|
graph.add_dependency(None, b1, a1)
|
|
graph.add_dependency(None, b2, a2)
|
|
|
|
executor = MigrationExecutor(None)
|
|
executor.loader = FakeLoader(graph, {a1, b1, a2, b2, a3, a4})
|
|
|
|
plan = executor.migration_plan({a1})
|
|
|
|
should_be_rolled_back = [b2_impl, a4_impl, a2_impl, a3_impl]
|
|
exp = [(m, True) for m in should_be_rolled_back]
|
|
self.assertEqual(plan, exp)
|
|
|
|
def test_backwards_nothing_to_do(self):
|
|
r"""
|
|
If the current state satisfies the given target, do nothing.
|
|
|
|
a: 1 <--- 2
|
|
b: \- 1
|
|
c: \- 1
|
|
|
|
If a1 is applied already and a2 is not, and we're asked to migrate to
|
|
a1, don't apply or unapply b1 or c1, regardless of their current state.
|
|
"""
|
|
a1_impl = FakeMigration('a1')
|
|
a1 = ('a', '1')
|
|
a2_impl = FakeMigration('a2')
|
|
a2 = ('a', '2')
|
|
b1_impl = FakeMigration('b1')
|
|
b1 = ('b', '1')
|
|
c1_impl = FakeMigration('c1')
|
|
c1 = ('c', '1')
|
|
graph = MigrationGraph()
|
|
graph.add_node(a1, a1_impl)
|
|
graph.add_node(a2, a2_impl)
|
|
graph.add_node(b1, b1_impl)
|
|
graph.add_node(c1, c1_impl)
|
|
graph.add_dependency(None, a2, a1)
|
|
graph.add_dependency(None, b1, a1)
|
|
graph.add_dependency(None, c1, a1)
|
|
|
|
executor = MigrationExecutor(None)
|
|
executor.loader = FakeLoader(graph, {a1, b1})
|
|
|
|
plan = executor.migration_plan({a1})
|
|
|
|
self.assertEqual(plan, [])
|