django/docs/releases/5.2.txt

============================================
Django 5.2 release notes - UNDER DEVELOPMENT
============================================

*Expected April 2025*

Welcome to Django 5.2!

These release notes cover the :ref:`new features <whats-new-5.2>`, as well as
some :ref:`backwards incompatible changes <backwards-incompatible-5.2>` you
should be aware of when upgrading from Django 5.1 or earlier. We've
:ref:`begun the deprecation process for some features
<deprecated-features-5.2>`.

See the :doc:`/howto/upgrade-version` guide if you're updating an existing
project.

Django 5.2 is designated as a :term:`long-term support release
<Long-term support release>`. It will receive security updates for at least
three years after its release. Support for the previous LTS, Django 4.2, will
end in April 2026.

Python compatibility
====================

Django 5.2 supports Python 3.10, 3.11, 3.12, and 3.13. We **highly recommend**
and only officially support the latest release of each series.

.. _whats-new-5.2:

What's new in Django 5.2
========================

Automatic models import in the ``shell``
----------------------------------------

The :djadmin:`shell` management command now automatically imports models from
all installed apps. You can view further details of the imported objects by
setting the ``--verbosity`` flag to 2 or more:

.. console::

    $ python -Wall manage.py shell --verbosity=2
    6 objects imported automatically, including:

      from django.contrib.admin.models import LogEntry
      from django.contrib.auth.models import Group, Permission, User
      from django.contrib.contenttypes.models import ContentType
      from django.contrib.sessions.models import Session

This :ref:`behavior can be customized <customizing-shell-auto-imports>` to add
or remove automatic imports.

Composite Primary Keys
----------------------

The new :class:`django.db.models.CompositePrimaryKey` allows tables to be
created with a primary key consisting of multiple fields.

To use a composite primary key, when defining a model set the ``pk`` attribute
to be a ``CompositePrimaryKey``::

    from django.db import models


    class Release(models.Model):
        pk = models.CompositePrimaryKey("version", "name")
        version = models.IntegerField()
        name = models.CharField(max_length=20)

See :doc:`/topics/composite-primary-key` for more details.

Simplified override of :class:`~django.forms.BoundField`
--------------------------------------------------------

Prior to version 5.2, overriding :meth:`.Field.get_bound_field()` was the only
option to use a custom :class:`~django.forms.BoundField`. Django now supports
specifying the following attributes to customize form rendering:

* :attr:`.BaseRenderer.bound_field_class` at the project level,
* :attr:`.Form.bound_field_class` at the form level, and
* :attr:`.Field.bound_field_class` at the field level.

For example, to customize the ``BoundField`` of a ``Form`` class::

    from django import forms


    class CustomBoundField(forms.BoundField):

        custom_class = "custom"

        def css_classes(self, extra_classes=None):
            result = super().css_classes(extra_classes)
            if self.custom_class not in result:
                result += f" {self.custom_class}"
            return result.strip()


    class CustomForm(forms.Form):
        bound_field_class = CustomBoundField

        name = forms.CharField(
            label="Your Name",
            max_length=100,
            required=False,
            widget=forms.TextInput(attrs={"class": "name-input-class"}),
        )
        email = forms.EmailField(label="Your Email")


When rendering a ``CustomForm`` instance, the following HTML is included:

.. code:: html

    <div class="custom">
      <label for="id_name">Your Name:</label>
      <input type="text" name="name" class="name-input-class" maxlength="100" id="id_name">
    </div>

    <div class="custom">
      <label for="id_email">Your Email:</label>
      <input type="email" name="email" maxlength="320" required="" id="id_email">
    </div>


See :ref:`custom-boundfield` for more details about this feature.

Minor features
--------------

:mod:`django.contrib.admin`
~~~~~~~~~~~~~~~~~~~~~~~~~~~

* The ``admin/base.html`` template now has a new block
  :ref:`extrabody <extrabody>` for adding custom code before the closing
  ``</body>`` tag.

* The value of a :class:`~django.db.models.URLField` now renders as a link.

:mod:`django.contrib.admindocs`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Links to components in docstrings now supports custom link text, using the
  format ``:role:`link text <link>```. See :ref:`documentation helpers
  <admindocs-helpers>` for more details.

* The :ref:`model pages <admindocs-model-reference>` are now restricted to
  users with the corresponding view or change permissions.

:mod:`django.contrib.auth`
~~~~~~~~~~~~~~~~~~~~~~~~~~

* The default iteration count for the PBKDF2 password hasher is increased from
  870,000 to 1,000,000.

* The following new asynchronous methods are now provided, using an ``a``
  prefix:

  * :meth:`.UserManager.acreate_user`
  * :meth:`.UserManager.acreate_superuser`
  * :meth:`.BaseUserManager.aget_by_natural_key`
  * :meth:`.User.aget_user_permissions`
  * :meth:`.User.aget_all_permissions`
  * :meth:`.User.aget_group_permissions`
  * :meth:`.User.ahas_perm`
  * :meth:`.User.ahas_perms`
  * :meth:`.User.ahas_module_perms`
  * :meth:`.ModelBackend.aauthenticate`
  * :meth:`.ModelBackend.aget_user_permissions`
  * :meth:`.ModelBackend.aget_group_permissions`
  * :meth:`.ModelBackend.aget_all_permissions`
  * :meth:`.ModelBackend.ahas_perm`
  * :meth:`.ModelBackend.ahas_module_perms`
  * :meth:`.RemoteUserBackend.aauthenticate`
  * :meth:`.RemoteUserBackend.aconfigure_user`

* Auth backends can now provide async implementations which are used when
  calling async auth functions (e.g.
  :func:`~.django.contrib.auth.aauthenticate`) to reduce context-switching
  which improves performance. See :ref:`adding an async interface
  <writing-authentication-backends-async-interface>` for more details.

* The :ref:`password validator classes <included-password-validators>`
  now have a new method ``get_error_message()``, which can be overridden in
  subclasses to customize the error messages.

:mod:`django.contrib.gis`
~~~~~~~~~~~~~~~~~~~~~~~~~

* GDAL now supports curved geometries ``CurvePolygon``, ``CompoundCurve``,
  ``CircularString``, ``MultiSurface``, and ``MultiCurve`` via the new
  :attr:`.OGRGeometry.has_curve` property, and the
  :meth:`.OGRGeometry.get_linear_geometry` and
  :meth:`.OGRGeometry.get_curve_geometry` methods.

* :lookup:`coveredby` and :lookup:`covers` lookup are now supported on MySQL.

:mod:`django.contrib.syndication`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* All :class:`~django.utils.feedgenerator.SyndicationFeed` classes now support
  a ``stylesheets`` attribute. If specified, an ``<? xml-stylesheet ?>``
  processing instruction will be added to the top of the document for each
  stylesheet in the given list. See :ref:`feed-stylesheets` for more details.

Database backends
~~~~~~~~~~~~~~~~~

* MySQL connections now default to using the ``utf8mb4`` character set,
  instead of ``utf8``, which is an alias for the deprecated character set
  ``utf8mb3``.

* Oracle backends now support :ref:`connection pools <oracle-pool>`, by setting
  ``"pool"`` in the :setting:`OPTIONS` part of your database configuration.

Decorators
~~~~~~~~~~

* :func:`~django.utils.decorators.method_decorator` now supports wrapping
  asynchronous view methods.

Email
~~~~~

* Tuple items of :class:`EmailMessage.attachments
  <django.core.mail.EmailMessage>` and
  :class:`EmailMultiAlternatives.attachments
  <django.core.mail.EmailMultiAlternatives>` are now named tuples, as opposed
  to regular tuples.

* :attr:`EmailMultiAlternatives.alternatives
  <django.core.mail.EmailMultiAlternatives.alternatives>` is now a list of
  named tuples, as opposed to regular tuples.

* The new :meth:`~django.core.mail.EmailMultiAlternatives.body_contains` method
  returns a boolean indicating whether a provided text is contained in the
  email ``body`` and in all attached MIME type ``text/*`` alternatives.

Error Reporting
~~~~~~~~~~~~~~~

* The attribute :attr:`.SafeExceptionReporterFilter.hidden_settings` now
  treats values as sensitive if their name includes ``AUTH``.

Forms
~~~~~

* The new :class:`~django.forms.ColorInput` form widget is for entering a color
  in ``rrggbb`` hexadecimal format and renders as ``<input type="color" ...>``.
  Some browsers support a visual color picker interface for this input type.

* The new :class:`~django.forms.SearchInput` form widget is for entering search
  queries and renders as ``<input type="search" ...>``.

* The new :class:`~django.forms.TelInput` form widget is for entering telephone
  numbers and renders as ``<input type="tel" ...>``.

* The new ``field_id`` argument for :class:`~django.forms.ErrorList` allows an
  HTML ``id`` attribute to be added in the error template. See
  :attr:`.ErrorList.field_id` for details.

* An :attr:`~django.forms.BoundField.aria_describedby` property is added to
  ``BoundField`` to ease use of this HTML attribute in templates.

* To improve accessibility for screen reader users ``aria-describedby`` is used
  to associate form fields with their error messages. See
  :ref:`how form errors are displayed <form-error-display>` for details.

* The new asset object :class:`~django.forms.Script` is available for adding
  custom HTML-attributes to JavaScript in form media. See
  :ref:`paths as objects <form-media-asset-objects>` for more details.

Management Commands
~~~~~~~~~~~~~~~~~~~

* A new warning is displayed when running :djadmin:`runserver`, indicating that
  it is unsuitable for production. This warning can be suppressed by setting
  the :envvar:`HIDE_PRODUCTION_WARNING` environment variable to ``"true"``.

* The :djadmin:`makemigrations` and :djadmin:`migrate` commands  have a new
  ``Command.autodetector`` attribute for subclasses to override in order to use
  a custom autodetector class.

* The new :meth:`.BaseCommand.get_check_kwargs` method can be overridden in
  custom commands to control the running of system checks, e.g. to opt into
  database-dependent checks.

Migrations
~~~~~~~~~~

* The new operation :class:`.AlterConstraint` is a no-op operation that alters
  constraints without dropping and recreating constraints in the database.

Models
~~~~~~

* The ``SELECT`` clause generated when using :meth:`.QuerySet.values` and
  :meth:`.QuerySet.values_list` now matches the specified order of the
  referenced expressions. Previously, the order was based on a set of
  counterintuitive rules which made query combination through methods such as
  :meth:`.QuerySet.union` unpredictable.

* Added support for validation of model constraints which use a
  :class:`~django.db.models.GeneratedField`.

* The new :attr:`.Expression.set_returning` attribute specifies that the
  expression contains a set-returning function, enforcing subquery evaluation.
  This is necessary for many Postgres set-returning functions.

* :attr:`CharField.max_length <django.db.models.CharField.max_length>` is no
  longer required to be set on SQLite, which supports unlimited ``VARCHAR``
  columns.

* :meth:`.QuerySet.explain` now supports the ``memory`` and ``serialize``
  options on PostgreSQL 17+.

* The new :class:`~django.db.models.functions.JSONArray` database function
  accepts a list of field names or expressions and returns a JSON array
  containing those values.

* The new :attr:`.Expression.allows_composite_expressions` attribute specifies
  that the expression allows composite expressions, for example, to support
  :ref:`composite primary keys <cpk-and-database-functions>`.

Requests and Responses
~~~~~~~~~~~~~~~~~~~~~~

* The new :attr:`.HttpResponse.text` property provides the string
  representation of :attr:`.HttpResponse.content`.

* The new :meth:`.HttpRequest.get_preferred_type` method can be used to query
  the preferred media type the client accepts.

* The new ``preserve_request`` argument for
  :class:`~django.http.HttpResponseRedirect` and
  :class:`~django.http.HttpResponsePermanentRedirect`
  determines whether the HTTP status codes 302/307 or 301/308 are used,
  respectively.

* The new ``preserve_request`` argument for
  :func:`~django.shortcuts.redirect` allows to instruct the user agent to reuse
  the HTTP method and body during redirection using specific status codes.

Serialization
~~~~~~~~~~~~~

* Each serialization format now defines a ``Deserializer`` class, rather than a
  function, to improve extensibility when defining a
  :ref:`custom serialization format <custom-serialization-formats>`.

Templates
~~~~~~~~~

* The new :meth:`~django.template.Library.simple_block_tag` decorator enables
  the creation of simple block tags, which can accept and use a section of the
  template.

Tests
~~~~~

* Stack frames from Django's custom assertions are now hidden. This makes test
  failures easier to read and enables :option:`test --pdb` to directly enter
  into the failing test method.

* Data loaded from :attr:`~django.test.TransactionTestCase.fixtures` and from
  migrations enabled with :ref:`serialized_rollback=True
  <test-case-serialized-rollback>` are now available during
  ``TransactionTestCase.setUpClass()``.

URLs
~~~~

* :func:`~django.urls.reverse` now accepts ``query`` and ``fragment`` keyword
  arguments, allowing the addition of a query string and/or fragment identifier
  in the generated URL, respectively.

Utilities
~~~~~~~~~

* :class:`~django.utils.safestring.SafeString` now returns
  :py:data:`NotImplemented` in ``__add__`` for non-string right-hand side
  values. This aligns with the :py:class:`str` addition behavior and allows
  ``__radd__`` to be used if available.

* :func:`~django.utils.html.format_html_join` now supports taking an iterable
  of mappings, passing their contents as keyword arguments to
  :func:`~django.utils.html.format_html`.

.. _backwards-incompatible-5.2:

Backwards incompatible changes in 5.2
=====================================

Database backend API
--------------------

This section describes changes that may be needed in third-party database
backends.

* The new :meth:`Model._is_pk_set() <django.db.models.Model._is_pk_set>` method
  allows checking if a Model instance's primary key is defined.

* ``BaseDatabaseOperations.adapt_decimalfield_value()`` is now a no-op, simply
  returning the given value.

:mod:`django.contrib.gis`
-------------------------

* Support for PostGIS 3.0 is removed.

* Support for GDAL 3.0 is removed.

Dropped support for PostgreSQL 13
---------------------------------

Upstream support for PostgreSQL 13 ends in November 2025. Django 5.2 supports
PostgreSQL 14 and higher.

Changed MySQL connection character set default
----------------------------------------------

MySQL connections now default to using the ``utf8mb4`` character set, instead
of ``utf8``, which is an alias for the deprecated character set ``utf8mb3``.
``utf8mb3`` can be specified in the ``OPTIONS`` part of the ``DATABASES``
setting, if needed for legacy databases.

Miscellaneous
-------------

* Adding :attr:`.EmailMultiAlternatives.alternatives` is now only supported via
  the :meth:`~.EmailMultiAlternatives.attach_alternative` method.

* The minimum supported version of ``gettext`` is increased from 0.15 to 0.19.

* ``HttpRequest.accepted_types`` is now sorted by the client's preference,
  based on the request's ``Accept`` header.

* The attributes :attr:`.UniqueConstraint.violation_error_code` and
  :attr:`.UniqueConstraint.violation_error_message` are now always used when
  provided. Previously, they were ignored if :attr:`.UniqueConstraint.fields`
  was set without a :attr:`.UniqueConstraint.condition`.

* The :func:`~django.template.context_processors.debug` context processor is no
  longer included in the default project template.

* The following methods now have ``alters_data=True`` set to prevent side
  effects when :ref:`rendering a template context <alters-data-description>`:

  * :meth:`.UserManager.create_user`
  * :meth:`.UserManager.acreate_user`
  * :meth:`.UserManager.create_superuser`
  * :meth:`.UserManager.acreate_superuser`
  * :meth:`.QuerySet.create`
  * :meth:`.QuerySet.acreate`
  * :meth:`.QuerySet.bulk_create`
  * :meth:`.QuerySet.abulk_create`
  * :meth:`.QuerySet.get_or_create`
  * :meth:`.QuerySet.aget_or_create`
  * :meth:`.QuerySet.update_or_create`
  * :meth:`.QuerySet.aupdate_or_create`

* The minimum supported version of ``oracledb`` is increased from 1.3.2 to
  2.3.0.

* Built-in aggregate functions accepting only one argument (``Avg``, ``Count``,
  ``Max``, ``Min``, ``StdDev``, ``Sum``, and ``Variance``) now raise
  :exc:`TypeError` when called with an incorrect number of arguments.

.. _deprecated-features-5.2:

Features deprecated in 5.2
==========================

Miscellaneous
-------------

* The ``all`` argument for the ``django.contrib.staticfiles.finders.find()``
  function is deprecated in favor of the ``find_all`` argument.

* The fallback to ``request.user`` when ``user`` is ``None`` in
  ``django.contrib.auth.login()`` and ``django.contrib.auth.alogin()`` will be
  removed.

* The ``ordering`` keyword argument of the PostgreSQL specific aggregation
  functions ``django.contrib.postgres.aggregates.ArrayAgg``,
  ``django.contrib.postgres.aggregates.JSONBAgg``, and
  ``django.contrib.postgres.aggregates.StringAgg`` is deprecated in favor
  of the ``order_by`` argument.