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396 lines
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396 lines
10 KiB
Plaintext
============================================
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Django 3.1 release notes - UNDER DEVELOPMENT
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============================================
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*Expected August 2020*
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Welcome to Django 3.1!
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These release notes cover the :ref:`new features <whats-new-3.1>`, as well as
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some :ref:`backwards incompatible changes <backwards-incompatible-3.1>` you'll
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want to be aware of when upgrading from Django 3.0 or earlier. We've
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:ref:`dropped some features<removed-features-3.1>` that have reached the end of
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their deprecation cycle, and we've :ref:`begun the deprecation process for
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some features <deprecated-features-3.1>`.
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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 3.1 supports Python 3.6, 3.7, and 3.8. We **highly recommend** and only
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officially support the latest release of each series.
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.. _whats-new-3.1:
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What's new in Django 3.1
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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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* ...
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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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180,000 to 216,000.
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* Added the :setting:`PASSWORD_RESET_TIMEOUT` setting to define the minimum
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number of seconds a password reset link is valid for. This is encouraged
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instead of deprecated ``PASSWORD_RESET_TIMEOUT_DAYS``, which will be removed
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in Django 4.0.
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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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* :lookup:`relate` lookup is now supported on MariaDB.
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* Added the :attr:`.LinearRing.is_counterclockwise` property.
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* :class:`~django.contrib.gis.db.models.functions.AsGeoJSON` is now supported
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on Oracle.
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* Added the :class:`~django.contrib.gis.db.models.functions.AsWKB` and
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:class:`~django.contrib.gis.db.models.functions.AsWKT` functions.
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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:`~django.contrib.postgres.indexes.BloomIndex` class allows
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creating ``bloom`` indexes in the database. The new
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:class:`~django.contrib.postgres.operations.BloomExtension` migration
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operation installs the ``bloom`` extension to add support for this index.
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* :meth:`~django.db.models.Model.get_FOO_display` now supports
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:class:`~django.contrib.postgres.fields.ArrayField` and
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:class:`~django.contrib.postgres.fields.RangeField`.
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* The new :lookup:`rangefield.lower_inc`, :lookup:`rangefield.lower_inf`,
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:lookup:`rangefield.upper_inc`, and :lookup:`rangefield.upper_inf` allows
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querying :class:`~django.contrib.postgres.fields.RangeField` by a bound type.
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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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* The :setting:`STATICFILES_DIRS` setting now supports :class:`pathlib.Path`.
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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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* The :func:`~django.views.decorators.cache.cache_control` decorator and
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:func:`~django.utils.cache.patch_cache_control` method now support multiple
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field names in the ``no-cache`` directive for the ``Cache-Control`` header,
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according to :rfc:`7234#section-5.2.2.2`.
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* :meth:`~django.core.caches.cache.delete` now returns ``True`` if the key was
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successfully deleted, ``False`` otherwise.
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CSRF
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~~~~
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* ...
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Email
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~~~~~
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* The :setting:`EMAIL_FILE_PATH` setting, used by the :ref:`file email backend
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<topic-email-file-backend>`, now supports :class:`pathlib.Path`.
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File Storage
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~~~~~~~~~~~~
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* ``FileSystemStorage.save()`` method now supports :class:`pathlib.Path`.
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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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* ...
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Migrations
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~~~~~~~~~~
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* Migrations are now loaded also from directories without ``__init__.py``
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files.
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Models
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~~~~~~
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* The new :class:`~django.db.models.functions.ExtractIsoWeekDay` function
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extracts ISO-8601 week days from :class:`~django.db.models.DateField` and
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:class:`~django.db.models.DateTimeField`, and the new :lookup:`iso_week_day`
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lookup allows querying by an ISO-8601 day of week.
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* :meth:`.QuerySet.explain` now supports:
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* ``TREE`` format on MySQL 8.0.16+,
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* ``analyze`` option on MySQL 8.0.18+ and MariaDB.
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* Added :class:`~django.db.models.PositiveBigIntegerField` which acts much like
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a :class:`~django.db.models.PositiveIntegerField` except that it only allows
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values under a certain (database-dependent) limit. Values from ``0`` to
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``9223372036854775807`` are safe in all databases supported by Django.
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* The new :class:`~django.db.models.RESTRICT` option for
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:attr:`~django.db.models.ForeignKey.on_delete` argument of ``ForeignKey`` and
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``OneToOneField`` emulates the behavior of the SQL constraint ``ON DELETE
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RESTRICT``.
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* :attr:`.CheckConstraint.check` now supports boolean expressions.
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Pagination
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~~~~~~~~~~
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* :class:`~django.core.paginator.Paginator` can now be iterated over to yield
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its pages.
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Requests and Responses
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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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* :class:`~django.test.SimpleTestCase` now implements the ``debug()`` method to
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allow running a test without collecting the result and catching exceptions.
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This can be used to support running tests under a debugger.
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* The new :setting:`MIGRATE <TEST_MIGRATE>` test database setting allows
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disabling of migrations during a test database creation.
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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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* :func:`~django.utils.encoding.filepath_to_uri` now supports
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:class:`pathlib.Path`.
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* :func:`~django.utils.dateparse.parse_duration` now supports comma separators
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for decimal fractions in the ISO 8601 format.
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* :func:`~django.utils.dateparse.parse_datetime`,
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:func:`~django.utils.dateparse.parse_duration`, and
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:func:`~django.utils.dateparse.parse_time` now support comma separators for
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milliseconds.
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Validators
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~~~~~~~~~~
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* ...
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Miscellaneous
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~~~~~~~~~~~~~
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* The SQLite backend now supports :class:`pathlib.Path` for the ``NAME``
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setting.
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* The ``settings.py`` generated by the :djadmin:`startproject` command now uses
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:class:`pathlib.Path` instead of :mod:`os.path` for building filesystem
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paths.
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.. _backwards-incompatible-3.1:
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Backwards incompatible changes in 3.1
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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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* ``DatabaseOperations.fetch_returned_insert_columns()`` now requires an
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additional ``returning_params`` argument.
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Dropped support for MariaDB 10.1
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--------------------------------
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Upstream support for MariaDB 10.1 ends in October 2020. Django 3.1 supports
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MariaDB 10.2 and higher.
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Miscellaneous
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-------------
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* The cache keys used by :ttag:`cache` and generated by
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:func:`~django.core.cache.utils.make_template_fragment_key` are different
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from the keys generated by older versions of Django. After upgrading to
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Django 3.1, the first request to any previously cached template fragment will
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be a cache miss.
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* The compatibility imports of ``django.core.exceptions.EmptyResultSet`` in
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``django.db.models.query``, ``django.db.models.sql``, and
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``django.db.models.sql.datastructures`` are removed.
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* The compatibility import of ``django.core.exceptions.FieldDoesNotExist`` in
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``django.db.models.fields`` is removed.
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* The compatibility imports of ``django.forms.utils.pretty_name()`` and
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``django.forms.boundfield.BoundField`` in ``django.forms.forms`` are removed.
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* The compatibility imports of ``Context``, ``ContextPopException``, and
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``RequestContext`` in ``django.template.base`` are removed.
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* The compatibility import of
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``django.contrib.admin.helpers.ACTION_CHECKBOX_NAME`` in
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``django.contrib.admin`` is removed.
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* The :setting:`STATIC_URL` and :setting:`MEDIA_URL` settings set to relative
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paths are now prefixed by the server-provided value of ``SCRIPT_NAME`` (or
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``/`` if not set). This change should not affect settings set to valid URLs
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or absolute paths.
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* :class:`~django.middleware.http.ConditionalGetMiddleware` no longer adds the
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``ETag`` header to responses with an empty
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:attr:`~django.http.HttpResponse.content`.
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* ``django.utils.decorators.classproperty()`` decorator is moved to
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``django.utils.functional.classproperty()``.
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* :tfilter:`floatformat` template filter now outputs (positive) ``0`` for
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negative numbers which round to zero.
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* :attr:`Meta.ordering <django.db.models.Options.ordering>` and
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:attr:`Meta.unique_together <django.db.models.Options.unique_together>`
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options on models in ``django.contrib`` modules that were formerly tuples are
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now lists.
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.. _deprecated-features-3.1:
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Features deprecated in 3.1
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==========================
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Miscellaneous
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-------------
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* ``PASSWORD_RESET_TIMEOUT_DAYS`` setting is deprecated in favor of
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:setting:`PASSWORD_RESET_TIMEOUT`.
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* The undocumented usage of the :lookup:`isnull` lookup with non-boolean values
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as the right-hand side is deprecated, use ``True`` or ``False`` instead.
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* The barely documented ``django.db.models.query_utils.InvalidQuery`` exception
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class is deprecated in favor of
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:class:`~django.core.exceptions.FieldDoesNotExist` and
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:class:`~django.core.exceptions.FieldError`.
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.. _removed-features-3.1:
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Features removed in 3.1
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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 3.1.
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See :ref:`deprecated-features-2.2` for details on these changes, including how
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to remove usage of these features.
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* ``django.utils.timezone.FixedOffset`` is removed.
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* ``django.core.paginator.QuerySetPaginator`` is removed.
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* A model's ``Meta.ordering`` doesn't affect ``GROUP BY`` queries.
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* ``django.contrib.postgres.fields.FloatRangeField`` and
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``django.contrib.postgres.forms.FloatRangeField`` are removed.
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* The ``FILE_CHARSET`` setting is removed.
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* ``django.contrib.staticfiles.storage.CachedStaticFilesStorage`` is removed.
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* The ``RemoteUserBackend.configure_user()`` method requires ``request`` as the
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first positional argument.
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* Support for ``SimpleTestCase.allow_database_queries`` and
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``TransactionTestCase.multi_db`` is removed.
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