django/docs/releases/4.2.1.txt

==========================
Django 4.2.1 release notes
==========================

*May 3, 2023*

Django 4.2.1 fixes a security issue with severity "low" and several bugs in
4.2.

Bugfixes
========

* Fixed a regression in Django 4.2 that caused a crash of ``QuerySet.defer()``
  when deferring fields by attribute names (:ticket:`34458`).

* Fixed a regression in Django 4.2 that caused a crash of
  :class:`~django.contrib.postgres.search.SearchVector` function with ``%``
  characters (:ticket:`34459`).

* Fixed a regression in Django 4.2 that caused aggregation over query that
  uses explicit grouping to group against the wrong columns (:ticket:`34464`).

* Reallowed, following a regression in Django 4.2, setting the
  ``"cursor_factory"`` option in :setting:`OPTIONS` on PostgreSQL
  (:ticket:`34466`).

* Enforced UTF-8 client encoding on PostgreSQL, following a regression in
  Django 4.2 (:ticket:`34470`).

* Fixed a regression in Django 4.2 where ``i18n_patterns()`` didn't respect the
  ``prefix_default_language`` argument when a fallback language of the default
  language was used (:ticket:`34455`).

* Fixed a regression in Django 4.2 where creating copies and deep copies of
  ``HttpRequest``, ``HttpResponse``, and their subclasses didn't always work
  correctly (:ticket:`34482`, :ticket:`34484`).

* Fixed a regression in Django 4.2 where ``timesince`` and ``timeuntil``
  template filters returned incorrect results for a datetime with a non-UTC
  timezone when a time difference is less than 1 day (:ticket:`34483`).

* Fixed a regression in Django 4.2 that caused a crash of
  :class:`~django.contrib.postgres.search.SearchHeadline` function with
  ``psycopg`` 3 (:ticket:`34486`).

* Fixed a regression in Django 4.2 that caused incorrect ``ClearableFileInput``
  margins in the admin (:ticket:`34506`).

* Fixed a regression in Django 4.2 where breadcrumbs didn't appear on admin
  site app index views (:ticket:`34512`).