============================================ Django 3.2 release notes - UNDER DEVELOPMENT ============================================ *Expected April 2021* Welcome to Django 3.2! These release notes cover the :ref:`new features <whats-new-3.2>`, as well as some :ref:`backwards incompatible changes <backwards-incompatible-3.2>` you'll want to be aware of when upgrading from Django 3.1 or earlier. We've :ref:`begun the deprecation process for some features <deprecated-features-3.2>`. See the :doc:`/howto/upgrade-version` guide if you're updating an existing project. Django 3.2 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 2.2, will end in April 2022. Python compatibility ==================== Django 3.2 supports Python 3.6, 3.7, and 3.8. We **highly recommend** and only officially support the latest release of each series. .. _whats-new-3.2: What's new in Django 3.2 ======================== Minor features -------------- :mod:`django.contrib.admin` ~~~~~~~~~~~~~~~~~~~~~~~~~~~ * :attr:`.ModelAdmin.search_fields` now allows searching against quoted phrases with spaces. :mod:`django.contrib.admindocs` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.auth` ~~~~~~~~~~~~~~~~~~~~~~~~~~ * The default iteration count for the PBKDF2 password hasher is increased from 216,000 to 260,000. * The default variant for the Argon2 password hasher is changed to Argon2id. ``memory_cost`` and ``parallelism`` are increased to 102,400 and 8 respectively to match the ``argon2-cffi`` defaults. Increasing the ``memory_cost`` pushes the required memory from 512 KB to 100 MB. This is still rather conservative but can lead to problems in memory constrained environments. If this is the case, the existing hasher can be subclassed to override the defaults. :mod:`django.contrib.contenttypes` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.gis` ~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.messages` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * The :class:`~django.contrib.postgres.operations.CreateExtension` operation now checks that the extension already exists in the database and skips the migration if so. :mod:`django.contrib.postgres` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * The new :attr:`.ExclusionConstraint.include` attribute allows creating covering exclusion constraints on PostgreSQL 12+. * The new :attr:`.ExclusionConstraint.opclasses` attribute allows setting PostgreSQL operator classes. * The new :attr:`.JSONBAgg.ordering` attribute determines the ordering of the aggregated elements. :mod:`django.contrib.redirects` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.sessions` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.sitemaps` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.sites` ~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.staticfiles` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.syndication` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... Cache ~~~~~ * ... CSRF ~~~~ * ... Email ~~~~~ * ... Error Reporting ~~~~~~~~~~~~~~~ * ... File Storage ~~~~~~~~~~~~ * ... File Uploads ~~~~~~~~~~~~ * ... Forms ~~~~~ * The new ``absolute_max`` argument for :func:`.formset_factory`, :func:`.inlineformset_factory`, and :func:`.modelformset_factory` allows customizing the maximum number of forms that can be instantiated when supplying ``POST`` data. See :ref:`formsets-absolute-max` for more details. * The new ``can_delete_extra`` argument for :func:`.formset_factory`, :func:`.inlineformset_factory`, and :func:`.modelformset_factory` allows removal of the option to delete extra forms. See :attr:`~.BaseFormSet.can_delete_extra` for more information. Generic Views ~~~~~~~~~~~~~ * ... Internationalization ~~~~~~~~~~~~~~~~~~~~ * ... Logging ~~~~~~~ * ... Management Commands ~~~~~~~~~~~~~~~~~~~ * :djadmin:`loaddata` now supports fixtures stored in XZ archives (``.xz``) and LZMA archives (``.lzma``). * :djadmin:`makemigrations` can now be called without an active database connection. In that case, check for a consistent migration history is skipped. * :attr:`.BaseCommand.requires_system_checks` now supports specifying a list of tags. System checks registered in the chosen tags will be checked for errors prior to executing the command. In previous versions, either all or none of the system checks were performed. Migrations ~~~~~~~~~~ * The new ``Operation.migration_name_fragment`` property allows providing a filename fragment that will be used to name a migration containing only that operation. Models ~~~~~~ * The new ``no_key`` parameter for :meth:`.QuerySet.select_for_update()`, supported on PostgreSQL, allows acquiring weaker locks that don't block the creation of rows that reference locked rows through a foreign key. * :class:`When() <django.db.models.expressions.When>` expression now allows using the ``condition`` argument with ``lookups``. * The new :attr:`.Index.include` and :attr:`.UniqueConstraint.include` attributes allow creating covering indexes and covering unique constraints on PostgreSQL 11+. * The new :attr:`.UniqueConstraint.opclasses` attribute allows setting PostgreSQL operator classes. Requests and Responses ~~~~~~~~~~~~~~~~~~~~~~ * ... Security ~~~~~~~~ * ... Serialization ~~~~~~~~~~~~~ * The new :ref:`JSONL <serialization-formats-jsonl>` serializer allows using the JSON Lines format with :djadmin:`dumpdata` and :djadmin:`loaddata`. This can be useful for populating large databases because data is loaded line by line into memory, rather than being loaded all at once. Signals ~~~~~~~ * ... Templates ~~~~~~~~~ * ... Tests ~~~~~ * Objects assigned to class attributes in :meth:`.TestCase.setUpTestData` are now isolated for each test method. Such objects are now required to support creating deep copies with :py:func:`copy.deepcopy`. Assigning objects which don't support ``deepcopy()`` is deprecated and will be removed in Django 4.1. * :class:`~django.test.Client` now preserves the request query string when following 307 and 308 redirects. URLs ~~~~ * ... Utilities ~~~~~~~~~ * ... Validators ~~~~~~~~~~ * ... .. _backwards-incompatible-3.2: Backwards incompatible changes in 3.2 ===================================== Database backend API -------------------- This section describes changes that may be needed in third-party database backends. * The new ``DatabaseFeatures.introspected_field_types`` property replaces these features: * ``can_introspect_autofield`` * ``can_introspect_big_integer_field`` * ``can_introspect_binary_field`` * ``can_introspect_decimal_field`` * ``can_introspect_duration_field`` * ``can_introspect_ip_address_field`` * ``can_introspect_positive_integer_field`` * ``can_introspect_small_integer_field`` * ``can_introspect_time_field`` * ``introspected_big_auto_field_type`` * ``introspected_small_auto_field_type`` * ``introspected_boolean_field_type`` * To enable support for covering indexes (:attr:`.Index.include`) and covering unique constraints (:attr:`.UniqueConstraint.include`), set ``DatabaseFeatures.supports_covering_indexes`` to ``True``. :mod:`django.contrib.gis` ------------------------- * Support for PostGIS 2.2 is removed. Dropped support for PostgreSQL 9.5 ---------------------------------- Upstream support for PostgreSQL 9.5 ends in February 2021. Django 3.2 supports PostgreSQL 9.6 and higher. Dropped support for MySQL 5.6 ----------------------------- The end of upstream support for MySQL 5.6 is April 2021. Django 3.2 supports MySQL 5.7 and higher. Miscellaneous ------------- * The undocumented ``SpatiaLiteOperations.proj4_version()`` method is renamed to ``proj_version()``. * Minified JavaScript files are no longer included with the admin. If you require these files to be minified, consider using a third party app or external build tool. The minified vendored JavaScript files packaged with the admin (e.g. :ref:`jquery.min.js <contrib-admin-jquery>`) are still included. * :attr:`.ModelAdmin.prepopulated_fields` no longer strips English stop words, such as ``'a'`` or ``'an'``. * :func:`~django.utils.text.slugify` now removes leading and trailing dashes and underscores. * The :tfilter:`intcomma` and :tfilter:`intword` template filters no longer depend on the :setting:`USE_L10N` setting. * Support for ``argon2-cffi`` < 19.1.0 is removed. * The cache keys no longer includes the language when internationalization is disabled (``USE_I18N = False``) and localization is enabled (``USE_L10N = True``). After upgrading to Django 3.2 in such configurations, the first request to any previously cached value will be a cache miss. .. _deprecated-features-3.2: Features deprecated in 3.2 ========================== Miscellaneous ------------- * Assigning objects which don't support creating deep copies with :py:func:`copy.deepcopy` to class attributes in :meth:`.TestCase.setUpTestData` is deprecated. * Using a boolean value in :attr:`.BaseCommand.requires_system_checks` is deprecated. Use ``'__all__'`` instead of ``True``, and ``[]`` (an empty list) instead of ``False``. * The ``whitelist`` argument and ``domain_whitelist`` attribute of :class:`~django.core.validators.EmailValidator` are deprecated. Use ``allowlist`` instead of ``whitelist``, and ``domain_allowlist`` instead of ``domain_whitelist``. You may need to rename ``whitelist`` in existing migrations.