django.git/django/db/models/query.py, branch main

Refs #28586 -- Added DEFAULT_FETCH_MODE module constant.

2026-04-19T19:28:13Z

This is a more attractive target for alteration than all of QuerySet.__init__().

Fixed #37016 -- Avoided propagating invalid arguments from When() to Q().

2026-04-03T13:37:32Z

Refs #28455 -- Avoided QuerySet cloning in simple prefetch_related() usages.

2026-03-11T17:05:44Z

manager.get_queryset() always returns freshly instantiated per-instance QuerySet which doesn't need subsequent cloning. Based on work originally done by Anssi Kääriäinen and Tim Graham.

Refs #28455 -- Implemented private API methods for preventing QuerySet cloning.

2026-03-11T17:05:44Z

Multiple calls are idempotent assuming they're balanced. Also, multiple calls to disable cloning followed by a single call to re-enable cloning will subsequently cause clones to occur - it is not a stack, just a toggle. @contextlib.contextmanager is intentionally not used for performance reasons: - decorator takes 1.1µs to execute, or 2µs if used correctly in a `with ...:` statement - custom class takes 300ns to execute, or 900ns if used correctly in a `with ...:` statement Based on work originally done by Anssi Kääriäinen and Tim Graham.

Fixed #36857 -- Added QuerySet.totally_ordered property.

2026-02-13T21:58:36Z

Thanks Simon Charette for the idea.

Fixed #36644 -- Enabled empty order_by() to avoid pk ordering by first()/last().

2026-02-06T20:45:45Z

Refs #36644 -- Applied default ordering after union().

2026-02-06T20:45:45Z

Fixed #35442 -- Prevented N+1 queries in RelatedManager with only().

2026-01-13T18:18:14Z

Co-authored-by: Simon Charette

Fixed #36702 -- Made bulk_create() return pk values set by an expression.

2025-11-06T16:58:01Z

Refs CVE-2025-64459 -- Avoided propagating invalid arguments to Q on dictionary expansion.

2025-11-05T12:20:57Z