from django.db import connection from django.db.migrations.executor import MigrationExecutor from django.db.migrations.graph import MigrationGraph from django.test import modify_settings, override_settings, TestCase from django.apps.registry import apps as global_apps from .test_base import MigrationTestBase @modify_settings(INSTALLED_APPS={'append': 'migrations2'}) class ExecutorTests(MigrationTestBase): """ Tests the migration executor (full end-to-end running). Bear in mind that if these are failing you should fix the other test failures first, as they may be propagating into here. """ available_apps = ["migrations", "migrations2", "django.contrib.auth", "django.contrib.contenttypes"] @override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"}) def test_run(self): """ Tests running a simple set of migrations. """ executor = MigrationExecutor(connection) # Let's look at the plan first and make sure it's up to scratch plan = executor.migration_plan([("migrations", "0002_second")]) self.assertEqual( plan, [ (executor.loader.graph.nodes["migrations", "0001_initial"], False), (executor.loader.graph.nodes["migrations", "0002_second"], False), ], ) # Were the tables there before? self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_book") # Alright, let's try running it executor.migrate([("migrations", "0002_second")]) # Are the tables there now? self.assertTableExists("migrations_author") self.assertTableExists("migrations_book") # Rebuild the graph to reflect the new DB state executor.loader.build_graph() # Alright, let's undo what we did plan = executor.migration_plan([("migrations", None)]) self.assertEqual( plan, [ (executor.loader.graph.nodes["migrations", "0002_second"], True), (executor.loader.graph.nodes["migrations", "0001_initial"], True), ], ) executor.migrate([("migrations", None)]) # Are the tables gone? self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_book") @override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"}) def test_run_with_squashed(self): """ Tests running a squashed migration from zero (should ignore what it replaces) """ executor = MigrationExecutor(connection) # Check our leaf node is the squashed one leaves = [key for key in executor.loader.graph.leaf_nodes() if key[0] == "migrations"] self.assertEqual(leaves, [("migrations", "0001_squashed_0002")]) # Check the plan plan = executor.migration_plan([("migrations", "0001_squashed_0002")]) self.assertEqual( plan, [ (executor.loader.graph.nodes["migrations", "0001_squashed_0002"], False), ], ) # Were the tables there before? self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_book") # Alright, let's try running it executor.migrate([("migrations", "0001_squashed_0002")]) # Are the tables there now? self.assertTableExists("migrations_author") self.assertTableExists("migrations_book") # Rebuild the graph to reflect the new DB state executor.loader.build_graph() # Alright, let's undo what we did. Should also just use squashed. plan = executor.migration_plan([("migrations", None)]) self.assertEqual( plan, [ (executor.loader.graph.nodes["migrations", "0001_squashed_0002"], True), ], ) executor.migrate([("migrations", None)]) # Are the tables gone? self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_book") @override_settings(MIGRATION_MODULES={ "migrations": "migrations.test_migrations", "migrations2": "migrations2.test_migrations_2", }) def test_empty_plan(self): """ Tests that re-planning a full migration of a fully-migrated set doesn't perform spurious unmigrations and remigrations. There was previously a bug where the executor just always performed the backwards plan for applied migrations - which even for the most recent migration in an app, might include other, dependent apps, and these were being unmigrated. """ # Make the initial plan, check it executor = MigrationExecutor(connection) plan = executor.migration_plan([ ("migrations", "0002_second"), ("migrations2", "0001_initial"), ]) self.assertEqual( plan, [ (executor.loader.graph.nodes["migrations", "0001_initial"], False), (executor.loader.graph.nodes["migrations", "0002_second"], False), (executor.loader.graph.nodes["migrations2", "0001_initial"], False), ], ) # Fake-apply all migrations executor.migrate([ ("migrations", "0002_second"), ("migrations2", "0001_initial") ], fake=True) # Rebuild the graph to reflect the new DB state executor.loader.build_graph() # Now plan a second time and make sure it's empty plan = executor.migration_plan([ ("migrations", "0002_second"), ("migrations2", "0001_initial"), ]) self.assertEqual(plan, []) # Erase all the fake records executor.recorder.record_unapplied("migrations2", "0001_initial") executor.recorder.record_unapplied("migrations", "0002_second") executor.recorder.record_unapplied("migrations", "0001_initial") @override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"}) def test_soft_apply(self): """ Tests detection of initial migrations already having been applied. """ state = {"faked": None} def fake_storer(phase, migration, fake): state["faked"] = fake executor = MigrationExecutor(connection, progress_callback=fake_storer) # Were the tables there before? self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_tribble") # Run it normally self.assertEqual( executor.migration_plan([("migrations", "0001_initial")]), [ (executor.loader.graph.nodes["migrations", "0001_initial"], False), ], ) executor.migrate([("migrations", "0001_initial")]) # Are the tables there now? self.assertTableExists("migrations_author") self.assertTableExists("migrations_tribble") # We shouldn't have faked that one self.assertEqual(state["faked"], False) # Rebuild the graph to reflect the new DB state executor.loader.build_graph() # Fake-reverse that executor.migrate([("migrations", None)], fake=True) # Are the tables still there? self.assertTableExists("migrations_author") self.assertTableExists("migrations_tribble") # Make sure that was faked self.assertEqual(state["faked"], True) # Finally, migrate forwards; this should fake-apply our initial migration executor.loader.build_graph() self.assertEqual( executor.migration_plan([("migrations", "0001_initial")]), [ (executor.loader.graph.nodes["migrations", "0001_initial"], False), ], ) executor.migrate([("migrations", "0001_initial")]) self.assertEqual(state["faked"], True) # And migrate back to clean up the database executor.loader.build_graph() executor.migrate([("migrations", None)]) self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_tribble") @override_settings( MIGRATION_MODULES={ "migrations": "migrations.test_migrations_custom_user", "django.contrib.auth": "django.contrib.auth.migrations", }, AUTH_USER_MODEL="migrations.Author", ) def test_custom_user(self): """ Regression test for #22325 - references to a custom user model defined in the same app are not resolved correctly. """ executor = MigrationExecutor(connection) self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_tribble") # Migrate forwards executor.migrate([("migrations", "0001_initial")]) self.assertTableExists("migrations_author") self.assertTableExists("migrations_tribble") # Make sure the soft-application detection works (#23093) # Change table_names to not return auth_user during this as # it wouldn't be there in a normal run, and ensure migrations.Author # exists in the global app registry temporarily. old_table_names = connection.introspection.table_names connection.introspection.table_names = lambda c: [x for x in old_table_names(c) if x != "auth_user"] migrations_apps = executor.loader.project_state(("migrations", "0001_initial")).render() global_apps.get_app_config("migrations").models["author"] = migrations_apps.get_model("migrations", "author") try: migration = executor.loader.get_migration("auth", "0001_initial") self.assertEqual(executor.detect_soft_applied(migration), True) finally: connection.introspection.table_names = old_table_names del global_apps.get_app_config("migrations").models["author"] # And migrate back to clean up the database executor.loader.build_graph() executor.migrate([("migrations", None)]) self.assertTableNotExists("migrations_author") self.assertTableNotExists("migrations_tribble") class FakeLoader(object): def __init__(self, graph, applied): self.graph = graph self.applied_migrations = applied class FakeMigration(object): """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): """ 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): """ 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, [])