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315 lines
6.7 KiB
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315 lines
6.7 KiB
Plaintext
============================================
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Django 4.1 release notes - UNDER DEVELOPMENT
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============================================
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*Expected August 2022*
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Welcome to Django 4.1!
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These release notes cover the :ref:`new features <whats-new-4.1>`, as well as
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some :ref:`backwards incompatible changes <backwards-incompatible-4.1>` you'll
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want to be aware of when upgrading from Django 4.0 or earlier. We've
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:ref:`begun the deprecation process for some features
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<deprecated-features-4.1>`.
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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 4.1 supports Python 3.8, 3.9, and 3.10. We **highly recommend** and only
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officially support the latest release of each series.
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.. _whats-new-4.1:
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What's new in Django 4.1
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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 admin :ref:`dark mode CSS variables <admin-theming>` are now applied in a
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separate stylesheet and template block.
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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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320,000 to 390,000.
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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 new :meth:`.GEOSGeometry.make_valid()` method allows converting invalid
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geometries to valid ones.
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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 :class:`BitXor() <django.contrib.postgres.aggregates.BitXor>`
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aggregate function returns an ``int`` of the bitwise ``XOR`` of all non-null
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input values.
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* :class:`~django.contrib.postgres.indexes.SpGistIndex` now supports covering
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indexes on PostgreSQL 14+.
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* :class:`~django.contrib.postgres.constraints.ExclusionConstraint` now
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supports covering exclusion constraints using SP-GiST indexes on PostgreSQL
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14+.
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* The new ``default_bounds`` attribute of :attr:`DateTimeRangeField
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<django.contrib.postgres.fields.DateTimeRangeField.default_bounds>` and
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:attr:`DecimalRangeField
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<django.contrib.postgres.fields.DecimalRangeField.default_bounds>` allows
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specifying bounds for list and tuple inputs.
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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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* The default sitemap index template ``<sitemapindex>`` now includes the
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``<lastmod>`` timestamp where available, through the new
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:meth:`~django.contrib.sitemaps.Sitemap.get_latest_lastmod` method. Custom
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sitemap index templates should be updated for the adjusted :ref:`context
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variables <sitemap-index-context-variables>`.
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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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* ...
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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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* ...
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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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* :option:`makemigrations --no-input` now logs default answers and reasons why
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migrations cannot be created.
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Migrations
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~~~~~~~~~~
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* ...
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Models
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~~~~~~
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* The ``order_by`` argument of the
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:class:`~django.db.models.expressions.Window` expression now accepts string
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references to fields and transforms.
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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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* :tfilter:`json_script` template filter now allows wrapping in a ``<script>``
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tag without the HTML ``id`` attribute.
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Tests
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~~~~~
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* A nested atomic block marked as durable in :class:`django.test.TestCase` now
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raises a ``RuntimeError``, the same as outside of tests.
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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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* ...
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Validators
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~~~~~~~~~~
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* ...
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.. _backwards-incompatible-4.1:
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Backwards incompatible changes in 4.1
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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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* ``BaseDatabaseFeatures.has_case_insensitive_like`` is changed from ``True``
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to ``False`` to reflect the behavior of most databases.
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* ``DatabaseIntrospection.get_key_columns()`` is removed. Use
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``DatabaseIntrospection.get_relations()`` instead.
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Dropped support for MariaDB 10.2
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--------------------------------
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Upstream support for MariaDB 10.2 ends in May 2022. Django 4.1 supports MariaDB
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10.3 and higher.
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Miscellaneous
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-------------
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* Related managers for :class:`~django.db.models.ForeignKey`,
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:class:`~django.db.models.ManyToManyField`, and
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:class:`~django.contrib.contenttypes.fields.GenericRelation` are now cached
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on the :class:`~django.db.models.Model` instance to which they belong.
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* The Django test runner now returns a non-zero error code for unexpected
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successes from tests marked with :py:func:`unittest.expectedFailure`.
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.. _deprecated-features-4.1:
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Features deprecated in 4.1
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==========================
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Miscellaneous
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-------------
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* The context for sitemap index templates of a flat list of URLs is deprecated.
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Custom sitemap index templates should be updated for the adjusted
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:ref:`context variables <sitemap-index-context-variables>`, expecting a list
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of objects with ``location`` and optional ``lastmod`` attributes.
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Features removed in 4.1
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=======================
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These features have reached the end of their deprecation cycle and are removed
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in Django 4.1.
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See :ref:`deprecated-features-3.2` for details on these changes, including how
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to remove usage of these features.
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* Support for assigning objects which don't support creating deep copies with
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``copy.deepcopy()`` to class attributes in ``TestCase.setUpTestData()`` is
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removed.
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* Support for using a boolean value in
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:attr:`.BaseCommand.requires_system_checks` is removed.
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* The ``whitelist`` argument and ``domain_whitelist`` attribute of
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``django.core.validators.EmailValidator`` are removed.
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* The ``default_app_config`` application configuration variable is removed.
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* ``TransactionTestCase.assertQuerysetEqual()`` no longer calls ``repr()`` on a
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queryset when compared to string values.
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* The ``django.core.cache.backends.memcached.MemcachedCache`` backend is
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removed.
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* Support for the pre-Django 3.2 format of messages used by
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``django.contrib.messages.storage.cookie.CookieStorage`` is removed.
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