============================================
Django 5.1 release notes - UNDER DEVELOPMENT
============================================

*Expected August 2024*

Welcome to Django 5.1!

These release notes cover the :ref:`new features <whats-new-5.1>`, as well as
some :ref:`backwards incompatible changes <backwards-incompatible-5.1>` you'll
want to be aware of when upgrading from Django 5.0 or earlier. We've
:ref:`begun the deprecation process for some features
<deprecated-features-5.1>`.

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

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

Django 5.1 supports Python 3.10, 3.11, and 3.12. We **highly recommend** and
only officially support the latest release of each series.

.. _whats-new-5.1:

What's new in Django 5.1
========================

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

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

* ...

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

* ...

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

* The default iteration count for the PBKDF2 password hasher is increased from
  720,000 to 870,000.

:mod:`django.contrib.contenttypes`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

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

* ...

:mod:`django.contrib.messages`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

:mod:`django.contrib.postgres`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

:mod:`django.contrib.redirects`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

:mod:`django.contrib.sessions`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

:mod:`django.contrib.sitemaps`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

:mod:`django.contrib.sites`
~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

:mod:`django.contrib.staticfiles`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* ...

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

* ...

Asynchronous views
~~~~~~~~~~~~~~~~~~

* ...

Cache
~~~~~

* ...

CSRF
~~~~

* ...

Decorators
~~~~~~~~~~

* ...

Email
~~~~~

* ...

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

* ...

File Storage
~~~~~~~~~~~~

* ...

File Uploads
~~~~~~~~~~~~

* ...

Forms
~~~~~

* In order to improve accessibility and enable screen readers to associate
  fieldsets with their help text, the form fieldset now includes the
  ``aria-describedby`` HTML attribute.

Generic Views
~~~~~~~~~~~~~

* ...

Internationalization
~~~~~~~~~~~~~~~~~~~~

* ...

Logging
~~~~~~~

* ...

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

* ...

Migrations
~~~~~~~~~~

* ...

Models
~~~~~~

* :meth:`.QuerySet.explain` now supports the ``generic_plan`` option on
  PostgreSQL 16+.

* :class:`~django.db.models.expressions.RowRange` now accepts positive integers
  for the ``start`` argument and negative integers for the ``end`` argument.

* The new ``exclusion`` argument of
  :class:`~django.db.models.expressions.RowRange` and
  :class:`~django.db.models.expressions.ValueRange` allows excluding rows,
  groups, and ties from the window frames.

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

* ...

Security
~~~~~~~~

* ...

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

* ...

Signals
~~~~~~~

* ...

Templates
~~~~~~~~~

* Custom tags may now set extra data on the ``Parser`` object that will later
  be made available on the ``Template`` instance. Such data may be used, for
  example, by the template loader, or other template clients.

* The new :ttag:`{% query_string %} <query_string>` template tag allows
  changing a :class:`~django.http.QueryDict` instance for use in links, for
  example, to generate a link to the next page while keeping any filtering
  options in place.

Tests
~~~~~

* :meth:`~django.test.SimpleTestCase.assertContains`,
  :meth:`~django.test.SimpleTestCase.assertNotContains`, and
  :meth:`~django.test.SimpleTestCase.assertInHTML` assertions now add haystacks
  to assertion error messages.

* The Django test runner now supports a ``--screenshots`` option to save
  screenshots for Selenium tests.

URLs
~~~~

* ...

Utilities
~~~~~~~~~

* ...

Validators
~~~~~~~~~~

* ...

.. _backwards-incompatible-5.1:

Backwards incompatible changes in 5.1
=====================================

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

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

* ...

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

* Support for PostGIS 2.5 is removed.

Dropped support for MariaDB 10.4
--------------------------------

Upstream support for MariaDB 10.4 ends in June 2024. Django 5.1 supports
MariaDB 10.5 and higher.

Dropped support for PostgreSQL 12
---------------------------------

Upstream support for PostgreSQL 12 ends in November 2024. Django 5.1 supports
PostgreSQL 13 and higher.

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

* In order to improve accessibility, the admin's changelist filter is now
  rendered in a ``<nav>`` tag instead of a ``<div>``.

* :meth:`.SimpleTestCase.assertURLEqual` and
  :meth:`~django.test.SimpleTestCase.assertInHTML` now add ``": "`` to the
  ``msg_prefix``. This is consistent with the behavior of other assertions.

.. _deprecated-features-5.1:

Features deprecated in 5.1
==========================

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

* The ``ModelAdmin.log_deletion()`` and ``LogEntryManager.log_action()``
  methods are deprecated. Subclasses should implement
  ``ModelAdmin.log_deletions()`` and  ``LogEntryManager.log_actions()``
  instead.

Features removed in 5.1
=======================

These features have reached the end of their deprecation cycle and are removed
in Django 5.1.

See :ref:`deprecated-features-4.2` for details on these changes, including how
to remove usage of these features.

* The ``BaseUserManager.make_random_password()`` method is removed.

* The model's ``Meta.index_together`` option is removed.

* The ``length_is`` template filter is removed.

* The ``django.contrib.auth.hashers.SHA1PasswordHasher``,
  ``django.contrib.auth.hashers.UnsaltedSHA1PasswordHasher``, and
  ``django.contrib.auth.hashers.UnsaltedMD5PasswordHasher`` are removed.

* The model ``django.contrib.postgres.fields.CICharField``,
  ``django.contrib.postgres.fields.CIEmailField``, and
  ``django.contrib.postgres.fields.CITextField`` are removed, except for
  support in historical migrations.

* The ``django.contrib.postgres.fields.CIText`` mixin is removed.

* The ``map_width`` and ``map_height`` attributes of ``BaseGeometryWidget`` are
  removed.

* The ``SimpleTestCase.assertFormsetError()`` method is removed.

* The ``TransactionTestCase.assertQuerysetEqual()`` method is removed.

* Support for passing encoded JSON string literals to ``JSONField`` and
  associated lookups and expressions is removed.

* Support for passing positional arguments to ``Signer`` and
  ``TimestampSigner`` is removed.

* The ``DEFAULT_FILE_STORAGE`` and ``STATICFILES_STORAGE`` settings is removed.

* The ``django.core.files.storage.get_storage_class()`` function is removed.
