========================
*August 7, 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
should 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, 3.12, and 3.13 (as of 5.1.3). We
**highly recommend** and only officially support the latest release of each
series.
.. _whats-new-5.1:
What's new in Django 5.1
========================
``{% querystring %}`` template tag
-----------------------------------
Django 5.1 introduces the :ttag:`{% querystring %} <querystring>` template
tag, simplifying the modification of query parameters in URLs, making it easier
to generate links that maintain existing query parameters while adding or
changing specific ones.
For instance, navigating pagination and query strings in templates can be
cumbersome. Consider this template fragment that dynamically generates a URL
for navigating to the next page within a paginated view:
.. code-block:: html+django
{ Linebreaks added for readability, this should be one, long line. }
<a href="?{% for key, values in request.GET.iterlists %}
{% if key != "page" %}
{% for value in values %}
{{ key }}={{ value }}&
{% endfor %}
{% endif %}
{% endfor %}page={{ page.next_page_number }}">Next page</a>
When switching to using this new template tag, the above magically becomes:
.. code-block:: html+django
<a href="{% querystring page=page.next_page_number %}">Next page</a>
PostgreSQL Connection Pools
---------------------------
Django 5.1 also introduces :ref:`connection pool <postgresql-pool>` support for
PostgreSQL. As the time to establish a new connection can be relatively long,
keeping connections open can reduce latency.
To use a connection pool with `psycopg`_, you can set the ``"pool"`` option
inside :setting:`OPTIONS` to be a dict to be passed to
:class:`~psycopg:psycopg_pool.ConnectionPool`, or to ``True`` to use the
``ConnectionPool`` defaults::
DATABASES = {
"default": {
"ENGINE": "django.db.backends.postgresql",
...
"OPTIONS": {
"pool": {
"min_size": 2,
"max_size": 4,
"timeout": 10,
}
},
},
}
.. _psycopg: https://www.psycopg.org/
Middleware to require authentication by default
-----------------------------------------------
The new :class:`~django.contrib.auth.middleware.LoginRequiredMiddleware`
redirects all unauthenticated requests to a login page. Views can allow
unauthenticated requests by using the new
:func:`~django.contrib.auth.decorators.login_not_required` decorator.
``LoginRequiredMiddleware`` respects the ``login_url`` and
``redirect_field_name`` values set via the
:func:`~.django.contrib.auth.decorators.login_required` decorator, but does not
support setting ``login_url`` or ``redirect_field_name`` via the
:class:`~django.contrib.auth.mixins.LoginRequiredMixin`.
To enable this, add ``"django.contrib.auth.middleware.LoginRequiredMiddleware"``
to your :setting:`MIDDLEWARE` setting.
Minor features
--------------
:mod:`django.contrib.admin`
~~~~~~~~~~~~~~~~~~~~~~~~~~~
* :attr:`.ModelAdmin.list_display` now supports using ``__`` lookups to list
fields from related models.
:mod:`django.contrib.auth`
~~~~~~~~~~~~~~~~~~~~~~~~~~
* The default iteration count for the PBKDF2 password hasher is increased from
720,000 to 870,000.
* The default ``parallelism`` of the ``ScryptPasswordHasher`` is
increased from 1 to 5, to follow OWASP recommendations.
* The new :class:`~django.contrib.auth.forms.AdminUserCreationForm` and
the existing :class:`~django.contrib.auth.forms.AdminPasswordChangeForm` now
support disabling password-based authentication by setting an unusable
password on form save. This is now available in the admin when visiting the
user creation and password change pages.
* :func:`~.django.contrib.auth.decorators.login_required`,
:func:`~.django.contrib.auth.decorators.permission_required`, and
:func:`~.django.contrib.auth.decorators.user_passes_test` decorators now
support wrapping asynchronous view functions.
* ``ReadOnlyPasswordHashWidget`` now includes a button to reset the user's
password, which replaces the link previously embedded in the
``ReadOnlyPasswordHashField``'s help text, improving the overall
accessibility of the
:class:`~django.contrib.auth.forms.UserChangeForm`.
:mod:`django.contrib.gis`
~~~~~~~~~~~~~~~~~~~~~~~~~
* :class:`~django.contrib.gis.db.models.functions.BoundingCircle` is now
supported on SpatiaLite 5.1+.
* :class:`~django.contrib.gis.db.models.Collect` is now supported on MySQL
8.0.24+.
* :class:`~django.contrib.gis.geoip2.GeoIP2` now allows querying using
:class:`ipaddress.IPv4Address` or :class:`ipaddress.IPv6Address` objects.
* :meth:`.GeoIP2.country` now exposes the ``continent_code``,
``continent_name``, and ``is_in_european_union`` values.
* :meth:`.GeoIP2.city` now exposes the ``accuracy_radius`` and ``region_name``
values. In addition, the ``dma_code`` and ``region`` values are now exposed
as ``metro_code`` and ``region_code``, but the previous keys are also
retained for backward compatibility.
* :class:`~django.contrib.gis.measure.Area` now supports the ``ha`` unit.
* The new :attr:`.OGRGeometry.is_3d` attribute allows checking if a geometry
has a ``Z`` coordinate dimension.
* The new :meth:`.OGRGeometry.set_3d` method allows addition and removal of the
``Z`` coordinate dimension.
* :class:`~django.contrib.gis.gdal.OGRGeometry`,
:class:`~django.contrib.gis.gdal.Point`,
:class:`~django.contrib.gis.gdal.LineString`,
:class:`~django.contrib.gis.gdal.Polygon`, and
:class:`~django.contrib.gis.gdal.GeometryCollection` and its subclasses now
support measured geometries via the new :attr:`.OGRGeometry.is_measured` and
``m`` properties, and the :meth:`.OGRGeometry.set_measured` method.
* :attr:`.OGRGeometry.centroid` is now available on all supported geometry
types.
* :class:`FromWKB() <django.contrib.gis.db.models.functions.FromWKB>` and
:class:`FromWKT() <django.contrib.gis.db.models.functions.FromWKT>` functions
now support the optional ``srid`` argument (except for Oracle where it is
ignored).
:mod:`django.contrib.postgres`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* :class:`~django.contrib.postgres.indexes.BTreeIndex` now supports the
``deduplicate_items`` parameter.
:mod:`django.contrib.sessions`
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* :class:`django.contrib.sessions.backends.cached_db.SessionStore` now handles
exceptions when storing session information in the cache, logging proper
error messages with their traceback via the newly added
:ref:`sessions logger <django-contrib-sessions-logger>`.
* :class:`django.contrib.sessions.backends.base.SessionBase` and all built-in
session engines now provide async API. The new asynchronous methods all have
``a`` prefixed names, e.g. ``aget()``, ``akeys()``, or ``acycle_key()``.
Database backends
~~~~~~~~~~~~~~~~~
* ``"init_command"`` option is now supported in :setting:`OPTIONS` on SQLite
to allow specifying :ref:`pragma options <sqlite-init-command>` to set upon
connection.
* ``"transaction_mode"`` option is now supported in :setting:`OPTIONS` on
SQLite to allow specifying the :ref:`sqlite-transaction-behavior`.
* ``"pool"`` option is now supported in :setting:`OPTIONS` on PostgreSQL to
allow using :ref:`connection pools <postgresql-pool>`.
Error Reporting
~~~~~~~~~~~~~~~
* In order to improve accessibility, the technical 404 and 500 error pages now
use HTML landmark elements for the header, footer, and main content areas.
File Storage
~~~~~~~~~~~~
* The :attr:`~django.core.files.storage.FileSystemStorage.allow_overwrite`
parameter of :class:`~django.core.files.storage.FileSystemStorage` now allows
saving new files over existing ones.
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.
Management Commands
~~~~~~~~~~~~~~~~~~~
* The :djadmin:`makemigrations` command now displays meaningful symbols for
each operation to highlight :class:`operation categories
<django.db.migrations.operations.base.OperationCategory>`.
Migrations
~~~~~~~~~~
* The new ``Operation.category`` attribute allows specifying an
:class:`operation category
<django.db.migrations.operations.base.OperationCategory>` used by the
:djadmin:`makemigrations` to display a meaningful symbol for the operation.
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.
* :meth:`.QuerySet.order_by` now supports ordering by annotation transforms
such as ``JSONObject`` keys and ``ArrayAgg`` indices.
* :class:`F() <django.db.models.F>` and :class:`OuterRef()
<django.db.models.OuterRef>` expressions that output
:class:`~django.db.models.CharField`, :class:`~django.db.models.EmailField`,
:class:`~django.db.models.SlugField`, :class:`~django.db.models.URLField`,
:class:`~django.db.models.TextField`, or
:class:`~django.contrib.postgres.fields.ArrayField` can now be :ref:`sliced
<slicing-using-f>`.
* The new ``from_queryset`` argument of :meth:`.Model.refresh_from_db` and
:meth:`.Model.arefresh_from_db` allows customizing the queryset used to
reload a model's value. This can be used to lock the row before reloading or
to select related objects.
* The new :attr:`.Expression.constraint_validation_compatible` attribute allows
specifying that the expression should be ignored during a constraint
validation.
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.
* :ref:`Template engines <field-checking>` now implement a ``check()`` method
that is already registered with the check framework.
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 :class:`~django.test.RequestFactory`,
:class:`~django.test.AsyncRequestFactory`, :class:`~django.test.Client`, and
:class:`~django.test.AsyncClient` classes now support the ``query_params``
parameter, which accepts a dictionary of query string keys and values. This
allows setting query strings on any HTTP methods more easily.
.. code-block:: python
self.client.post("/items/1", query_params={"action": "delete"})
await self.async_client.post("/items/1", query_params={"action": "delete"})
* The new :meth:`.SimpleTestCase.assertNotInHTML` assertion allows testing that
an HTML fragment is not contained in the given HTML haystack.
* In order to enforce test isolation, database connections inside threads are
no longer allowed in :class:`~django.test.SimpleTestCase`.
Validators
~~~~~~~~~~
* The new :class:`~django.core.validators.DomainNameValidator` validates domain
names, including internationalized domain names. The new
:func:`~django.core.validators.validate_domain_name` function returns an
instance of :class:`~django.core.validators.DomainNameValidator`.
.. _backwards-incompatible-5.1:
Backwards incompatible changes in 5.1
=====================================
:mod:`django.contrib.gis`
-------------------------
* Support for PostGIS 2.5 is removed.
* Support for PROJ < 6 is removed.
* Support for GDAL 2.4 is removed.
* :class:`~django.contrib.gis.geoip2.GeoIP2` no longer opens both city and
country databases when a directory path is provided, preferring the city
database, if it is available. The country database is a subset of the city
database and both are not typically needed. If you require use of the country
database when in the same directory as the city database, explicitly pass the
country database path to the constructor.
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>``.
* In order to improve accessibility, the admin's footer is now rendered in
a ``<footer>`` tag instead of a ``<div>``, and also moved below the
``<div id="main">`` element.
* In order to improve accessibility, the expandable widget used for
:attr:`ModelAdmin.fieldsets <django.contrib.admin.ModelAdmin.fieldsets>` and
:attr:`InlineModelAdmin.fieldsets <django.contrib.admin.InlineModelAdmin>`,
when the fieldset has a name and use the ``collapse`` class, now includes
``<details>`` and ``<summary>`` elements.
* The JavaScript file ``collapse.js`` is removed since it is no longer needed
in the Django admin site.
* :meth:`.SimpleTestCase.assertURLEqual` and
:meth:`~django.test.SimpleTestCase.assertInHTML` now add ``": "`` to the
``msg_prefix``. This is consistent with the behavior of other assertions.
* ``django.utils.text.Truncator`` used by :tfilter:`truncatechars_html` and
:tfilter:`truncatewords_html` template filters now uses
:py:class:`html.parser.HTMLParser` subclasses. This results in a more robust
and faster operation, but there may be small differences in the output.
* The undocumented ``django.urls.converters.get_converter()`` function is
removed.
* The minimum supported version of SQLite is increased from 3.27.0 to 3.31.0.
* :class:`~django.db.models.FileField` now raises a
:class:`~django.core.exceptions.FieldError` when saving a file without a
``name``.
* ``ImageField.update_dimension_fields(force=True)`` is no longer called after
saving the image to storage. If your storage backend resizes images, the
``width_field`` and ``height_field`` will not match the width and height of
the image.
* The minimum supported version of ``asgiref`` is increased from 3.7.0 to
3.8.1.
.. _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.
* The undocumented ``django.utils.itercompat.is_iterable()`` function and the
``django.utils.itercompat`` module are deprecated. Use
``isinstance(..., collections.abc.Iterable)`` instead.
* The ``django.contrib.gis.geoip2.GeoIP2.coords()`` method is deprecated. Use
``django.contrib.gis.geoip2.GeoIP2.lon_lat()`` instead.
* The ``django.contrib.gis.geoip2.GeoIP2.open()`` method is deprecated. Use the
:class:`~django.contrib.gis.geoip2.GeoIP2` constructor instead.
* Passing positional arguments to :meth:`.Model.save` and :meth:`.Model.asave`
is deprecated in favor of keyword-only arguments.
* Setting ``django.contrib.gis.gdal.OGRGeometry.coord_dim`` is deprecated. Use
:meth:`~django.contrib.gis.gdal.OGRGeometry.set_3d` instead.
* Overriding existing converters with ``django.urls.register_converter()`` is
deprecated.
* The ``check`` keyword argument of ``CheckConstraint`` is deprecated in favor
of ``condition``.
* The undocumented ``OS_OPEN_FLAGS`` property of
:class:`~django.core.files.storage.FileSystemStorage` is deprecated. To allow
overwriting files in storage, set the new
:attr:`~django.core.files.storage.FileSystemStorage.allow_overwrite` option
to ``True`` instead.
* The ``get_cache_name()`` method of ``FieldCacheMixin`` is deprecated in favor
of the ``cache_name`` cached property.
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.
===========================