chango.git/tests/backends/models.py, branch devmain

Fixed #36088 -- Avoided unnecessary DEFAULT usage on bulk_create().

2025-02-01T17:43:10Z

When all values of a field with a db_default are DatabaseDefault, which is the case most of the time, there is no point in specifying explicit DEFAULT for all INSERT VALUES as that's what the database will do anyway if not specified. In the case of PostgreSQL doing so can even be harmful as it prevents the usage of the UNNEST strategy and in the case of Oracle, which doesn't support the usage of the DEFAULT keyword, it unnecessarily requires providing literal db defaults. Thanks Lily Foote for the review.

Fixed #35238 -- Fixed database serialization crash when base managers use prefetch_related().

2024-02-20T21:14:17Z

Regression in 139135627650ed6aaaf4c755b82c3bd43f2b8f51 following deprecation in eedbf930287cb72e9afab1f7208c24b1146b0c4ec.

Refs #33476 -- Reformatted code with Black.

2022-02-07T19:37:05Z

Fixed #32158 -- Fixed loaddata crash on SQLite when table/column names are SQL keywords.

2020-12-28T07:57:30Z

Fixed #31762 -- Made reloading the database for tests use the base manager.

2020-11-11T07:33:30Z

Co-authored-by: Eugene Kulak

Refs #31051 -- Fixed reloading the database with circular related objects and natural keys for tests.

2020-04-02T09:35:33Z

Made deserialize_db_from_string() do not sort dependencies. deserialize_db_from_string() doesn't use natural keys, so there is no need to sort dependencies in serialize_db_to_string(). Moreover, sorting models cause issues for circular dependencies.

Refs #26552 -- Added test for reloading the database with self-referential objects.

2020-04-02T07:17:41Z

Fixed #26552 -- Deferred constraint checks when reloading the database with data for tests.

2020-02-14T12:18:06Z

deserialize_db_from_string() loads the full serialized database contents, which might contain forward references and cycles. That caused IntegrityError because constraints were checked immediately. Now, it loads data in a transaction with constraint checks deferred until the end of the transaction.

Refs #29444 -- Allowed returning multiple fields from INSERT statements on PostgreSQL.

2019-09-09T08:51:14Z

Thanks Florian Apolloner, Tim Graham, Simon Charette, Nick Pope, and Mariusz Felisiak for reviews.

Refs #29444 -- Added support for fetching a returned non-integer insert values on Oracle.

2019-07-08T06:53:08Z

This is currently not actively used, since the ORM will ask the SQL compiler to only return auto fields.