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============================================
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Django 4.2 release notes - UNDER DEVELOPMENT
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============================================
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*Expected April 2023*
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Welcome to Django 4.2!
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These release notes cover the :ref:`new features <whats-new-4.2>`, as well as
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some :ref:`backwards incompatible changes <backwards-incompatible-4.2>` you'll
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want to be aware of when upgrading from Django 4.1 or earlier. We've
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:ref:`begun the deprecation process for some features
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<deprecated-features-4.2>`.
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See the :doc:`/howto/upgrade-version` guide if you're updating an existing
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project.
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Python compatibility
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====================
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Django 4.2 supports Python 3.8, 3.9, 3.10, and 3.11. We **highly recommend**
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and only officially support the latest release of each series.
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.. _whats-new-4.2:
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What's new in Django 4.2
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========================
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Minor features
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--------------
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:mod:`django.contrib.admin`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* The light or dark color theme of the admin can now be toggled in the UI, as
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well as being set to follow the system setting.
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* The admin's font stack now prefers system UI fonts and no longer requires
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downloading fonts. Additionally, CSS variables are available to more easily
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override the default font families.
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* The :source:`admin/delete_confirmation.html
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<django/contrib/admin/templates/admin/delete_confirmation.html>` template now
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has some additional blocks and scripting hooks to ease customization.
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* The chosen options of
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:attr:`~django.contrib.admin.ModelAdmin.filter_horizontal` and
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:attr:`~django.contrib.admin.ModelAdmin.filter_vertical` widgets are now
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filterable.
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:mod:`django.contrib.admindocs`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.auth`
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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* The default iteration count for the PBKDF2 password hasher is increased from
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390,000 to 480,000.
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:mod:`django.contrib.contenttypes`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.gis`
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~~~~~~~~~~~~~~~~~~~~~~~~~
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* The :doc:`GeoJSON serializer </ref/contrib/gis/serializers>` now outputs the
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``id`` key for serialized features, which defaults to the primary key of
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objects.
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* The :class:`~django.contrib.gis.gdal.GDALRaster` class now supports
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:class:`pathlib.Path`.
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* The :class:`~django.contrib.gis.geoip2.GeoIP2` class now supports ``.mmdb``
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files downloaded from DB-IP.
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* The OpenLayers template widget no longer includes inline CSS (which also
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removes the former ``map_css`` block) to better comply with a strict Content
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Security Policy.
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:mod:`django.contrib.messages`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.postgres`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* The new :lookup:`trigram_strict_word_similar` lookup, and the
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:class:`TrigramStrictWordSimilarity()
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<django.contrib.postgres.search.TrigramStrictWordSimilarity>` and
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:class:`TrigramStrictWordDistance()
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<django.contrib.postgres.search.TrigramStrictWordDistance>` expressions allow
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using trigram strict word similarity.
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:mod:`django.contrib.redirects`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.sessions`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.sitemaps`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.sites`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.staticfiles`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.syndication`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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Cache
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~~~~~
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* ...
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CSRF
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~~~~
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* ...
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Decorators
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~~~~~~~~~~
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* ...
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Email
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~~~~~
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* ...
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Error Reporting
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~~~~~~~~~~~~~~~
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* ...
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File Storage
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~~~~~~~~~~~~
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* ...
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File Uploads
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~~~~~~~~~~~~
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* ...
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Forms
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~~~~~
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* :class:`~django.forms.ModelForm` now accepts the new ``Meta`` option
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``formfield_callback`` to customize form fields.
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* :func:`~django.forms.models.modelform_factory` now respects the
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``formfield_callback`` attribute of the ``form``’s ``Meta``.
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Generic Views
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~~~~~~~~~~~~~
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* ...
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Internationalization
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~~~~~~~~~~~~~~~~~~~~
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* Added support and translations for the Central Kurdish (Sorani) language.
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Logging
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~~~~~~~
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* ...
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Management Commands
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~~~~~~~~~~~~~~~~~~~
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* :djadmin:`makemessages` command now supports locales with private sub-tags
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such as ``nl_NL-x-informal``.
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* The new :option:`makemigrations --update` option merges model changes into
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the latest migration and optimizes the resulting operations.
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Migrations
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~~~~~~~~~~
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* Migrations now support serialization of ``enum.Flag`` objects.
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Models
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~~~~~~
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* ``QuerySet`` now extensively supports filtering against
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:ref:`window-functions` with the exception of disjunctive filter lookups
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against window functions when performing aggregation.
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* :meth:`~.QuerySet.prefetch_related` now supports
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:class:`~django.db.models.Prefetch` objects with sliced querysets.
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* :ref:`Registering lookups <lookup-registration-api>` on
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:class:`~django.db.models.Field` instances is now supported.
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* The new ``robust`` argument for :func:`~django.db.transaction.on_commit`
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allows performing actions that can fail after a database transaction is
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successfully committed.
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* The new :class:`KT() <django.db.models.fields.json.KT>` expression represents
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the text value of a key, index, or path transform of
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:class:`~django.db.models.JSONField`.
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Requests and Responses
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~~~~~~~~~~~~~~~~~~~~~~
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* ...
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Security
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~~~~~~~~
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* ...
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Serialization
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~~~~~~~~~~~~~
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* ...
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Signals
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~~~~~~~
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* ...
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Templates
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~~~~~~~~~
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* ...
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Tests
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~~~~~
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* ...
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URLs
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~~~~
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* ...
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Utilities
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~~~~~~~~~
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* The new ``encoder`` parameter for :meth:`django.utils.html.json_script`
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function allows customizing a JSON encoder class.
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* The private internal vendored copy of ``urllib.parse.urlsplit()`` now strips
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``'\r'``, ``'\n'``, and ``'\t'`` (see :cve:`2022-0391` and :bpo:`43882`).
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This is to protect projects that may be incorrectly using the internal
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``url_has_allowed_host_and_scheme()`` function, instead of using one of the
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documented functions for handling URL redirects. The Django functions were
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not affected.
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Validators
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~~~~~~~~~~
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* ...
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.. _backwards-incompatible-4.2:
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Backwards incompatible changes in 4.2
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=====================================
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Database backend API
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--------------------
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This section describes changes that may be needed in third-party database
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backends.
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* ...
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Dropped support for MariaDB 10.3
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--------------------------------
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Upstream support for MariaDB 10.3 ends in May 2023. Django 4.2 supports MariaDB
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10.4 and higher.
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Dropped support for MySQL 5.7
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-----------------------------
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Upstream support for MySQL 5.7 ends in October 2023. Django 4.2 supports MySQL
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8 and higher.
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Dropped support for PostgreSQL 11
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---------------------------------
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Upstream support for PostgreSQL 11 ends in November 2023. Django 4.2 supports
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PostgreSQL 12 and higher.
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Miscellaneous
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-------------
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* The undocumented ``SimpleTemplateResponse.rendering_attrs`` and
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``TemplateResponse.rendering_attrs`` are renamed to ``non_picklable_attrs``.
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* The undocumented ``django.http.multipartparser.parse_header()`` function is
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removed. Use ``django.utils.http.parse_header_parameters()`` instead.
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* :ttag:`{% blocktranslate asvar … %}<blocktranslate>` result is now marked as
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safe for (HTML) output purposes.
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.. _deprecated-features-4.2:
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Features deprecated in 4.2
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==========================
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``index_together`` option is deprecated in favor of ``indexes``
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---------------------------------------------------------------
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The :attr:`Meta.index_together <django.db.models.Options.index_together>`
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option is deprecated in favor of the :attr:`~django.db.models.Options.indexes`
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option.
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Migrating existing ``index_together`` should be handled as a migration. For
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example::
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class Author(models.Model):
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rank = models.IntegerField()
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name = models.CharField(max_length=30)
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class Meta:
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index_together = [["rank", "name"]]
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Should become::
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class Author(models.Model):
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rank = models.IntegerField()
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name = models.CharField(max_length=30)
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class Meta:
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indexes = [models.Index(fields=["rank", "name"])]
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Running the :djadmin:`makemigrations` command will generate a migration
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containing a :class:`~django.db.migrations.operations.RenameIndex` operation
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which will rename the existing index.
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The ``AlterIndexTogether`` migration operation is now officially supported only
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for pre-Django 4.2 migration files. For backward compatibility reasons, it's
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still part of the public API, and there's no plan to deprecate or remove it,
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but it should not be used for new migrations. Use
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:class:`~django.db.migrations.operations.AddIndex` and
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:class:`~django.db.migrations.operations.RemoveIndex` operations instead.
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Miscellaneous
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-------------
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* The ``BaseUserManager.make_random_password()`` method is deprecated. See
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`recipes and best practices
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<https://docs.python.org/3/library/secrets.html#recipes-and-best-practices>`_
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for using Python's :py:mod:`secrets` module to generate passwords.
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* The ``length_is`` template filter is deprecated in favor of :tfilter:`length`
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and the ``==`` operator within an :ttag:`{% if %}<if>` tag. For example
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.. code-block:: html+django
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{% if value|length == 4 %}…{% endif %}
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{% if value|length == 4 %}True{% else %}False{% endif %}
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instead of:
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.. code-block:: html+django
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{% if value|length_is:4 %}…{% endif %}
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{{ value|length_is:4 }}
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* ``django.contrib.auth.hashers.SHA1PasswordHasher``,
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``django.contrib.auth.hashers.UnsaltedSHA1PasswordHasher``, and
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``django.contrib.auth.hashers.UnsaltedMD5PasswordHasher`` are deprecated.
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* ``django.contrib.postgres.fields.CICharField`` is deprecated in favor of
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``CharField(db_collation="…")`` with a case-insensitive non-deterministic
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collation.
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* ``django.contrib.postgres.fields.CIEmailField`` is deprecated in favor of
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``EmailField(db_collation="…")`` with a case-insensitive non-deterministic
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collation.
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* ``django.contrib.postgres.fields.CITextField`` is deprecated in favor of
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``TextField(db_collation="…")`` with a case-insensitive non-deterministic
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collation.
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* ``django.contrib.postgres.fields.CIText`` mixin is deprecated.
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* The ``map_height`` and ``map_width`` attributes of ``BaseGeometryWidget`` are
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deprecated, use CSS to size map widgets instead.
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