from django.test import TestCase from django.db import connection, models, migrations from django.db.migrations.state import ProjectState class OperationTests(TestCase): """ 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())) 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) 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.BooleanField(default=True)), ], ) 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. Most other tests use this 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_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) self.assertEqual(len(new_state.models["test_adfl", "pony"].fields), 3) # 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_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), 1) # 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_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")