import unittest from django.db import connection, models, migrations, router from django.db.models.fields import NOT_PROVIDED from django.db.transaction import atomic from django.db.utils import IntegrityError from django.db.migrations.state import ProjectState from .test_base import MigrationTestBase class OperationTests(MigrationTestBase): """ 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 set_up_test_model(self, app_label, second_model=False, related_model=False): """ Creates a test model state and database table. """ # Delete the tables if they already exist cursor = connection.cursor() try: cursor.execute("DROP TABLE %s_pony" % app_label) except: pass try: cursor.execute("DROP TABLE %s_stable" % app_label) except: pass # Make the "current" state operations = [migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.IntegerField(default=3)), ("weight", models.FloatField()), ], )] if second_model: operations.append(migrations.CreateModel("Stable", [("id", models.AutoField(primary_key=True))])) if related_model: operations.append(migrations.CreateModel( "Rider", [ ("id", models.AutoField(primary_key=True)), ("pony", models.ForeignKey("Pony")), ], )) project_state = ProjectState() for operation in operations: operation.state_forwards(app_label, project_state) # Set up the database with connection.schema_editor() as editor: for operation in operations: operation.database_forwards(app_label, editor, ProjectState(), project_state) return project_state 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)), ], ) # 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(len(definition[1]), 2) self.assertEqual(len(definition[2]), 0) self.assertEqual(definition[1][0], "Pony") 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") def test_rename_model(self): """ Tests the RenameModel operation. """ project_state = self.set_up_test_model("test_rnmo") # Test the state alteration operation = migrations.RenameModel("Pony", "Horse") new_state = project_state.clone() operation.state_forwards("test_rnmo", new_state) self.assertNotIn(("test_rnmo", "pony"), new_state.models) self.assertIn(("test_rnmo", "horse"), new_state.models) # Test the database alteration self.assertTableExists("test_rnmo_pony") self.assertTableNotExists("test_rnmo_horse") with connection.schema_editor() as editor: operation.database_forwards("test_rnmo", editor, project_state, new_state) self.assertTableNotExists("test_rnmo_pony") self.assertTableExists("test_rnmo_horse") # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_rnmo", editor, new_state, project_state) self.assertTableExists("test_dlmo_pony") self.assertTableNotExists("test_rnmo_horse") 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, default=5), ) new_state = project_state.clone() operation.state_forwards("test_adfl", new_state) self.assertEqual(len(new_state.models["test_adfl", "pony"].fields), 4) field = [ f for n, f in new_state.models["test_adfl", "pony"].fields if n == "height" ][0] 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") 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 = [ f for n, f in new_state.models["test_adflpd", "pony"].fields if n == "height" ][0] self.assertEqual(field.default, NOT_PROVIDED) 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(): new_apps = new_state.render() Pony = new_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_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) 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") 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) 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_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"].get_field_by_name("id"), models.AutoField) self.assertIsInstance(new_state.models["test_alflpk", "pony"].get_field_by_name("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) @unittest.skipUnless(connection.features.supports_foreign_keys, "No FK support") 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) # 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"].get_field_by_name("id"), models.AutoField) self.assertIsInstance(new_state.models["test_alflpkfk", "pony"].get_field_by_name("id"), models.FloatField) # Test the database alteration id_type = [c.type_code for c in connection.introspection.get_table_description(connection.cursor(), "test_alflpkfk_pony") if c.name == "id"][0] fk_type = [c.type_code for c in connection.introspection.get_table_description(connection.cursor(), "test_alflpkfk_rider") if c.name == "pony_id"][0] self.assertEqual(id_type, fk_type) with connection.schema_editor() as editor: operation.database_forwards("test_alflpkfk", editor, project_state, new_state) id_type = [c.type_code for c in connection.introspection.get_table_description(connection.cursor(), "test_alflpkfk_pony") if c.name == "id"][0] fk_type = [c.type_code for c in connection.introspection.get_table_description(connection.cursor(), "test_alflpkfk_rider") if c.name == "pony_id"][0] self.assertEqual(id_type, fk_type) # And test reversal with connection.schema_editor() as editor: operation.database_backwards("test_alflpkfk", editor, new_state, project_state) id_type = [c.type_code for c in connection.introspection.get_table_description(connection.cursor(), "test_alflpkfk_pony") if c.name == "id"][0] fk_type = [c.type_code for c in connection.introspection.get_table_description(connection.cursor(), "test_alflpkfk_rider") if c.name == "pony_id"][0] self.assertEqual(id_type, fk_type) 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") 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)") 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") # 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) 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"]) def test_run_sql(self): """ Tests the RunSQL operation. """ project_state = self.set_up_test_model("test_runsql") # Create the operation operation = migrations.RunSQL( "CREATE TABLE i_love_ponies (id int, special_thing int)", "DROP TABLE i_love_ponies", state_operations=[migrations.CreateModel("SomethingElse", [("id", models.AutoField(primary_key=True))])], ) # 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 the database alteration with connection.schema_editor() as editor: operation.database_forwards("test_runsql", editor, project_state, new_state) self.assertTableExists("i_love_ponies") # 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_python(self): """ Tests the RunPython operation """ project_state = self.set_up_test_model("test_runpython") # Create the operation operation = migrations.RunPython( """ Pony = models.get_model("test_runpython", "Pony") Pony.objects.create(pink=2, weight=4.55) Pony.objects.create(weight=1) """, ) # 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.render().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.render().get_model("test_runpython", "Pony").objects.count(), 2) # And test reversal fails with self.assertRaises(NotImplementedError): operation.database_backwards("test_runpython", None, new_state, project_state) # Now test we can do it with a callable 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) operation = migrations.RunPython(inner_method) with connection.schema_editor() as editor: operation.database_forwards("test_runpython", editor, project_state, new_state) self.assertEqual(project_state.render().get_model("test_runpython", "Pony").objects.count(), 4) class MigrateNothingRouter(object): """ A router that sends all writes to the other database. """ def allow_migrate(self, db, model): return False class MultiDBOperationTests(MigrationTestBase): multi_db = True def setUp(self): # Make the 'other' database appear to be a slave of the 'default' self.old_routers = router.routers router.routers = [MigrateNothingRouter()] def tearDown(self): # Restore the 'other' database as an independent database router.routers = self.old_routers def test_create_model(self): """ Tests that CreateModel honours multi-db settings. """ operation = migrations.CreateModel( "Pony", [ ("id", models.AutoField(primary_key=True)), ("pink", models.IntegerField(default=1)), ], ) # Test the state alteration project_state = ProjectState() new_state = project_state.clone() operation.state_forwards("test_crmo", new_state) # 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.assertTableNotExists("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")