django.git/django/db/models/fields/init.py, branch main

Fixed #35870 -- Made blank choice label in forms more accessible.

2026-04-22T21:06:29Z

Added new constant django.db.models.fields.BLANK_CHOICE_LABEL for an accessible and translatable blank choice label in forms. Deprecated django.db.models.fields.BLANK_CHOICE_DASH constant. Added the immediately deprecated transitional setting USE_BLANK_CHOICE_DASH. Co-Authored-By: Marijke Luttekes

Fixed #36987 -- Observed prepared argument in UUIDField.get_db_prep_value().

2026-03-18T12:22:29Z

This avoids two isinstance() calls per UUID value.

Fixed #36927 -- Optimized Field.deconstruct().

2026-03-13T20:29:10Z

Fixed #36727 -- Deprecated Field.get_placeholder in favor of get_placeholder_sql.

2026-03-13T00:01:02Z

The lack of ability of the get_placeholder call chain to return SQL and parameters separated so they can be mogrified by the backend at execution time forced implementations to dangerously interpolate potentially user controlled values. The get_placeholder_sql name was chosen due to its proximity to the previous method, but other options such as Field.as_sql were considered but ultimately rejected due to its different input signature compared to Expression.as_sql that might have lead to confusion. There is a lot of overlap between what Field.get_db_prep_value and get_placeholder_sql do but folding the latter in the former would require changing its return signature to return expression which is a way more invasive change than what is proposed here. Given we always call get_db_prep_value it might still be an avenue worth exploring in the future to offer a publicly documented interface to allow field to take an active part in the compilation chain. Thanks Jacob for the review.

Fixed #36858 -- Optimized `Field._get_default()` for `db_default` case.

2026-01-12T19:05:04Z

Create and share a single instance of `DatabaseDefault` instead of making a new one each time the lambda is called. The quick benchmark on the ticket shows a ~12% speedup for a large `bulk_create()` operation.

Refs #24920 -- Made DecimalField system checks database dependent.

2025-12-28T18:21:49Z

Thanks Tim Graham for the suggestion.

Fixed #36722 -- Moved AutoFieldMixin validate_autopk_value() check to get_db_prep_save.

2025-12-05T14:35:15Z

The validation in validate_autopk_value is specific to saving. Having it in get_db_prep_value caused Value(0, AutoField()) to fail unexpectedly when used in a filter on MySQL. Thanks Jacob Walls for the review.

Fixed #26609 -- Extended fields.E004 system check for unordered iterables.

2025-11-19T07:22:44Z

Co-authored-by: Karl Wooster

Fixed #24920 -- Added support for DecimalField with no precision.

2025-11-17T12:43:47Z

Thanks Lily for the review.

Fixed #21961 -- Added support for database-level delete options for ForeignKey.

2025-10-18T13:03:50Z

Thanks Simon Charette for pair programming. Co-authored-by: Nick Stefan Co-authored-by: Akash Kumar Sen <71623442+Akash-Kumar-Sen@users.noreply.github.com> Co-authored-by: Simon Charette

django.git/django/db/models/fields/__init__.py, branch main