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Code Issues 25 Releases Wiki Activity

Refs #24686 -- Made AlterField operation a noop when renaming related model with db_table.

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This commit is contained in:
devilsautumn 2023-07-18 00:31:38 +05:30 committed by Mariusz Felisiak
parent 07b7a3ab75
commit f05cc5e3d2
2 changed files with 22 additions and 0 deletions
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10
django/db/backends/base/schema.py
View File

@ -1601,10 +1601,20 @@ class BaseDatabaseSchemaEditor:
# - changing an attribute that doesn't affect the schema
# - changing an attribute in the provided set of ignored attributes
# - adding only a db_column and the column name is not changed
# - db_table does not change for model referenced by foreign keys
for attr in ignore.union(old_field.non_db_attrs):
old_kwargs.pop(attr, None)
for attr in ignore.union(new_field.non_db_attrs):
new_kwargs.pop(attr, None)
if (
not new_field.many_to_many
and old_field.remote_field
and new_field.remote_field
and old_field.remote_field.model._meta.db_table
== new_field.remote_field.model._meta.db_table
):
old_kwargs.pop("to", None)
new_kwargs.pop("to", None)
return self.quote_name(old_field.column) != self.quote_name(
new_field.column
) or (old_path, old_args, old_kwargs) != (new_path, new_args, new_kwargs)

12
tests/migrations/test_operations.py
View File

@ -997,6 +997,18 @@ class OperationTests(OperationTestBase):
with connection.schema_editor() as editor, self.assertNumQueries(0):
operation.database_forwards(app_label, editor, project_state, new_state)
@skipUnlessDBFeature("supports_foreign_keys")
def test_rename_model_with_db_table_and_fk_noop(self):
app_label = "test_rmwdbtfk"
project_state = self.set_up_test_model(
app_label, db_table="my_pony", related_model=True
)
new_state = project_state.clone()
operation = migrations.RenameModel("Pony", "LittleHorse")
operation.state_forwards(app_label, new_state)
with connection.schema_editor() as editor, self.assertNumQueries(0):
operation.database_forwards(app_label, editor, project_state, new_state)
def test_rename_model_with_self_referential_m2m(self):
app_label = "test_rename_model_with_self_referential_m2m"