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Diffstat (limited to 'tests/schema/tests.py')
| -rw-r--r-- | tests/schema/tests.py | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tests/schema/tests.py b/tests/schema/tests.py index 88d4ebbc8b..c42758d827 100644 --- a/tests/schema/tests.py +++ b/tests/schema/tests.py @@ -2796,6 +2796,40 @@ class SchemaTests(TransactionTestCase): def test_m2m_repoint_inherited(self): self._test_m2m_repoint(InheritedManyToManyField) + def test_m2m_rename(self): + class LocalBook(Model): + authors = ManyToManyField("schema.Author") + + class Meta: + app_label = "schema" + apps = new_apps + + self.local_models = [LocalBook] + with connection.schema_editor() as editor: + editor.create_model(Author) + editor.create_model(LocalBook) + old_field = LocalBook._meta.get_field("authors") + new_field = ManyToManyField("schema.Author") + new_field.contribute_to_class(LocalBook, "writers") + with connection.schema_editor() as editor: + editor.alter_field(LocalBook, old_field, new_field, strict=True) + # Ensure old M2M is gone. + with self.assertRaises(DatabaseError): + self.column_classes( + LocalBook._meta.get_field("authors").remote_field.through + ) + if connection.features.supports_foreign_keys: + self.assertForeignKeyExists( + new_field.remote_field.through, + "author_id", + "schema_author", + ) + new_through_table = new_field.remote_field.through._meta.db_table + self.assertIn("writers", new_through_table) + self.assertNotIn("authors", new_through_table) + # Remove the old field from meta for tearDown(). + LocalBook._meta.local_many_to_many.remove(old_field) + @isolate_apps("schema") def test_m2m_rename_field_in_target_model(self): class LocalTagM2MTest(Model): |