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614 lines
21 KiB
Plaintext
========================
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Django 4.2 release notes
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========================
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*April 3, 2023*
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Welcome to Django 4.2!
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These release notes cover the :ref:`new features <whats-new-4.2>`, as well as
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some :ref:`backwards incompatible changes <backwards-incompatible-4.2>` you'll
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want to be aware of when upgrading from Django 4.1 or earlier. We've
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:ref:`begun the deprecation process for some features
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<deprecated-features-4.2>`.
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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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Django 4.2 is designated as a :term:`long-term support release
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<Long-term support release>`. It will receive security updates for at least
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three years after its release. Support for the previous LTS, Django 3.2, will
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end in April 2024.
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Python compatibility
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====================
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Django 4.2 supports Python 3.8, 3.9, 3.10, and 3.11. We **highly recommend**
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and only officially support the latest release of each series.
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.. _whats-new-4.2:
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What's new in Django 4.2
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========================
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Psycopg 3 support
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-----------------
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Django now supports `psycopg`_ version 3.1.8 or higher. To update your code,
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install the `psycopg library`_, you don't need to change the
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:setting:`ENGINE <DATABASE-ENGINE>` as ``django.db.backends.postgresql``
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supports both libraries.
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Support for ``psycopg2`` is likely to be deprecated and removed at some point
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in the future.
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Be aware that ``psycopg`` 3 introduces some breaking changes over ``psycopg2``.
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As a consequence, you may need to make some changes to account for
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`differences from psycopg2`_.
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.. _psycopg: https://www.psycopg.org/psycopg3/
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.. _psycopg library: https://pypi.org/project/psycopg/
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.. _differences from psycopg2: https://www.psycopg.org/psycopg3/docs/basic/from_pg2.html
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Comments on columns and tables
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------------------------------
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The new :attr:`Field.db_comment <django.db.models.Field.db_comment>` and
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:attr:`Meta.db_table_comment <django.db.models.Options.db_table_comment>`
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options allow creating comments on columns and tables, respectively. For
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example::
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from django.db import models
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class Question(models.Model):
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text = models.TextField(db_comment="Poll question")
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pub_date = models.DateTimeField(
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db_comment="Date and time when the question was published",
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)
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class Meta:
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db_table_comment = "Poll questions"
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class Answer(models.Model):
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question = models.ForeignKey(
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Question,
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on_delete=models.CASCADE,
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db_comment="Reference to a question",
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)
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answer = models.TextField(db_comment="Question answer")
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class Meta:
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db_table_comment = "Question answers"
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Also, the new :class:`~django.db.migrations.operations.AlterModelTableComment`
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operation allows changing table comments defined in the
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:attr:`Meta.db_table_comment <django.db.models.Options.db_table_comment>`.
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Mitigation for the BREACH attack
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--------------------------------
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:class:`~django.middleware.gzip.GZipMiddleware` now includes a mitigation for
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the BREACH attack. It will add up to 100 random bytes to gzip responses to make
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BREACH attacks harder. Read more about the mitigation technique in the `Heal
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The Breach (HTB) paper`_.
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.. _Heal The Breach (HTB) paper: https://ieeexplore.ieee.org/document/9754554
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In-memory file storage
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----------------------
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The new :class:`django.core.files.storage.InMemoryStorage` class provides a
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non-persistent storage useful for speeding up tests by avoiding disk access.
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Custom file storages
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--------------------
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The new :setting:`STORAGES` setting allows configuring multiple custom file
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storage backends. It also controls storage engines for managing
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:doc:`files </topics/files>` (the ``"default"`` key) and :doc:`static files
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</ref/contrib/staticfiles>` (the ``"staticfiles"`` key).
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The old ``DEFAULT_FILE_STORAGE`` and ``STATICFILES_STORAGE`` settings are
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deprecated as of this release.
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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 light or dark color theme of the admin can now be toggled in the UI, as
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well as being set to follow the system setting.
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* The admin's font stack now prefers system UI fonts and no longer requires
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downloading fonts. Additionally, CSS variables are available to more easily
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override the default font families.
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* The :source:`admin/delete_confirmation.html
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<django/contrib/admin/templates/admin/delete_confirmation.html>` template now
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has some additional blocks and scripting hooks to ease customization.
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* The chosen options of
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:attr:`~django.contrib.admin.ModelAdmin.filter_horizontal` and
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:attr:`~django.contrib.admin.ModelAdmin.filter_vertical` widgets are now
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filterable.
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* The ``admin/base.html`` template now has a new block ``nav-breadcrumbs``
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which contains the navigation landmark and the ``breadcrumbs`` block.
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* :attr:`.ModelAdmin.list_editable` now uses atomic transactions when making
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edits.
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* jQuery is upgraded from version 3.6.0 to 3.6.4.
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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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390,000 to 600,000.
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* :class:`~django.contrib.auth.forms.UserCreationForm` now saves many-to-many
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form fields for a custom user model.
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* The new :class:`~django.contrib.auth.forms.BaseUserCreationForm` is now the
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recommended base class for customizing the user creation form.
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:mod:`django.contrib.gis`
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~~~~~~~~~~~~~~~~~~~~~~~~~
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* The :doc:`GeoJSON serializer </ref/contrib/gis/serializers>` now outputs the
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``id`` key for serialized features, which defaults to the primary key of
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objects.
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* The :class:`~django.contrib.gis.gdal.GDALRaster` class now supports
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:class:`pathlib.Path`.
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* The :class:`~django.contrib.gis.geoip2.GeoIP2` class now supports ``.mmdb``
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files downloaded from DB-IP.
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* The OpenLayers template widget no longer includes inline CSS (which also
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removes the former ``map_css`` block) to better comply with a strict Content
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Security Policy.
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* :class:`~django.contrib.gis.forms.widgets.OpenLayersWidget` is now based on
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OpenLayers 7.2.2 (previously 4.6.5).
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* The new :lookup:`isempty` lookup and
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:class:`IsEmpty() <django.contrib.gis.db.models.functions.IsEmpty>`
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expression allow filtering empty geometries on PostGIS.
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* The new :class:`FromWKB() <django.contrib.gis.db.models.functions.FromWKB>`
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and :class:`FromWKT() <django.contrib.gis.db.models.functions.FromWKT>`
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functions allow creating geometries from Well-known binary (WKB) and
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Well-known text (WKT) representations.
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:mod:`django.contrib.postgres`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* The new :lookup:`trigram_strict_word_similar` lookup, and the
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:class:`TrigramStrictWordSimilarity()
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<django.contrib.postgres.search.TrigramStrictWordSimilarity>` and
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:class:`TrigramStrictWordDistance()
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<django.contrib.postgres.search.TrigramStrictWordDistance>` expressions allow
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using trigram strict word similarity.
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* The :lookup:`arrayfield.overlap` lookup now supports ``QuerySet.values()``
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and ``values_list()`` as a right-hand side.
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:mod:`django.contrib.sitemaps`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* The new :meth:`.Sitemap.get_languages_for_item` method allows customizing the
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list of languages for which the item is displayed.
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:mod:`django.contrib.staticfiles`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* :class:`~django.contrib.staticfiles.storage.ManifestStaticFilesStorage` now
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has experimental support for replacing paths to JavaScript modules in
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``import`` and ``export`` statements with their hashed counterparts. If you
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want to try it, subclass ``ManifestStaticFilesStorage`` and set the
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``support_js_module_import_aggregation`` attribute to ``True``.
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* The new :attr:`.ManifestStaticFilesStorage.manifest_hash` attribute provides
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a hash over all files in the manifest and changes whenever one of the files
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changes.
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Database backends
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~~~~~~~~~~~~~~~~~
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* The new ``"assume_role"`` option is now supported in :setting:`OPTIONS` on
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PostgreSQL to allow specifying the :ref:`session role <database-role>`.
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* The new ``"server_side_binding"`` option is now supported in
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:setting:`OPTIONS` on PostgreSQL with ``psycopg`` 3.1.8+ to allow using
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:ref:`server-side binding cursors <database-server-side-parameters-binding>`.
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Error Reporting
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~~~~~~~~~~~~~~~
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* The debug page now shows :pep:`exception notes <678>` and
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:pep:`fine-grained error locations <657>` on Python 3.11+.
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* Session cookies are now treated as credentials and therefore hidden and
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replaced with stars (``**********``) in error reports.
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Forms
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~~~~~
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* :class:`~django.forms.ModelForm` now accepts the new ``Meta`` option
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``formfield_callback`` to customize form fields.
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* :func:`~django.forms.models.modelform_factory` now respects the
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``formfield_callback`` attribute of the ``form``’s ``Meta``.
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Internationalization
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~~~~~~~~~~~~~~~~~~~~
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* Added support and translations for the Central Kurdish (Sorani) language.
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* The :class:`~django.middleware.locale.LocaleMiddleware` now respects a
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language from the request when :func:`~django.conf.urls.i18n.i18n_patterns`
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is used with the ``prefix_default_language`` argument set to ``False``.
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Logging
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~~~~~~~
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* The :ref:`django-db-logger` logger now logs transaction management queries
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(``BEGIN``, ``COMMIT``, and ``ROLLBACK``) at the ``DEBUG`` level.
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Management Commands
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~~~~~~~~~~~~~~~~~~~
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* :djadmin:`makemessages` command now supports locales with private sub-tags
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such as ``nl_NL-x-informal``.
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* The new :option:`makemigrations --update` option merges model changes into
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the latest migration and optimizes the resulting operations.
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Migrations
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~~~~~~~~~~
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* Migrations now support serialization of ``enum.Flag`` objects.
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Models
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~~~~~~
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* ``QuerySet`` now extensively supports filtering against
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:ref:`window-functions` with the exception of disjunctive filter lookups
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against window functions when performing aggregation.
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* :meth:`~.QuerySet.prefetch_related` now supports
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:class:`~django.db.models.Prefetch` objects with sliced querysets.
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* :ref:`Registering lookups <lookup-registration-api>` on
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:class:`~django.db.models.Field` instances is now supported.
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* The new ``robust`` argument for :func:`~django.db.transaction.on_commit`
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allows performing actions that can fail after a database transaction is
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successfully committed.
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* The new :class:`KT() <django.db.models.fields.json.KT>` expression represents
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the text value of a key, index, or path transform of
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:class:`~django.db.models.JSONField`.
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* :class:`~django.db.models.functions.Now` now supports microsecond precision
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on MySQL and millisecond precision on SQLite.
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* :class:`F() <django.db.models.F>` expressions that output ``BooleanField``
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can now be negated using ``~F()`` (inversion operator).
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* ``Model`` now provides asynchronous versions of some methods that use the
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database, using an ``a`` prefix: :meth:`~.Model.adelete`,
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:meth:`~.Model.arefresh_from_db`, and :meth:`~.Model.asave`.
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* Related managers now provide asynchronous versions of methods that change a
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set of related objects, using an ``a`` prefix: :meth:`~.RelatedManager.aadd`,
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:meth:`~.RelatedManager.aclear`, :meth:`~.RelatedManager.aremove`, and
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:meth:`~.RelatedManager.aset`.
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* :attr:`CharField.max_length <django.db.models.CharField.max_length>` is no
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longer required to be set on PostgreSQL, which supports unlimited ``VARCHAR``
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columns.
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Requests and Responses
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~~~~~~~~~~~~~~~~~~~~~~
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* :class:`~django.http.StreamingHttpResponse` now supports async iterators
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when Django is served via ASGI.
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Tests
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~~~~~
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* The :option:`test --debug-sql` option now formats SQL queries with
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``sqlparse``.
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* The :class:`~django.test.RequestFactory`,
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:class:`~django.test.AsyncRequestFactory`, :class:`~django.test.Client`, and
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:class:`~django.test.AsyncClient` classes now support the ``headers``
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parameter, which accepts a dictionary of header names and values. This allows
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a more natural syntax for declaring headers.
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.. code-block:: python
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# Before:
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self.client.get("/home/", HTTP_ACCEPT_LANGUAGE="fr")
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await self.async_client.get("/home/", ACCEPT_LANGUAGE="fr")
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# After:
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self.client.get("/home/", headers={"accept-language": "fr"})
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await self.async_client.get("/home/", headers={"accept-language": "fr"})
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Utilities
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~~~~~~~~~
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* The new ``encoder`` parameter for :meth:`django.utils.html.json_script`
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function allows customizing a JSON encoder class.
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* The private internal vendored copy of ``urllib.parse.urlsplit()`` now strips
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``'\r'``, ``'\n'``, and ``'\t'`` (see :cve:`2022-0391` and :bpo:`43882`).
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This is to protect projects that may be incorrectly using the internal
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``url_has_allowed_host_and_scheme()`` function, instead of using one of the
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documented functions for handling URL redirects. The Django functions were
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not affected.
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* The new :func:`django.utils.http.content_disposition_header` function returns
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a ``Content-Disposition`` HTTP header value as specified by :rfc:`6266`.
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Validators
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~~~~~~~~~~
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* The list of common passwords used by ``CommonPasswordValidator`` is updated
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to the most recent version.
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.. _backwards-incompatible-4.2:
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Backwards incompatible changes in 4.2
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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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* ``DatabaseFeatures.allows_group_by_pk`` is removed as it only remained to
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accommodate a MySQL extension that has been supplanted by proper functional
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dependency detection in MySQL 5.7.15. Note that
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``DatabaseFeatures.allows_group_by_selected_pks`` is still supported and
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should be enabled if your backend supports functional dependency detection in
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``GROUP BY`` clauses as specified by the ``SQL:1999`` standard.
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* :djadmin:`inspectdb` now uses ``display_size`` from
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``DatabaseIntrospection.get_table_description()`` rather than
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``internal_size`` for ``CharField``.
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Dropped support for MariaDB 10.3
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--------------------------------
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Upstream support for MariaDB 10.3 ends in May 2023. Django 4.2 supports MariaDB
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10.4 and higher.
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Dropped support for MySQL 5.7
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-----------------------------
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Upstream support for MySQL 5.7 ends in October 2023. Django 4.2 supports MySQL
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8 and higher.
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Dropped support for PostgreSQL 11
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---------------------------------
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Upstream support for PostgreSQL 11 ends in November 2023. Django 4.2 supports
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PostgreSQL 12 and higher.
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Setting ``update_fields`` in ``Model.save()`` may now be required
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-----------------------------------------------------------------
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In order to avoid updating unnecessary columns,
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:meth:`.QuerySet.update_or_create` now passes ``update_fields`` to the
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:meth:`Model.save() <django.db.models.Model.save>` calls. As a consequence, any
|
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fields modified in the custom ``save()`` methods should be added to the
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``update_fields`` keyword argument before calling ``super()``. See
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:ref:`overriding-model-methods` for more details.
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Miscellaneous
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-------------
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* The undocumented ``SimpleTemplateResponse.rendering_attrs`` and
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``TemplateResponse.rendering_attrs`` are renamed to ``non_picklable_attrs``.
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* The undocumented ``django.http.multipartparser.parse_header()`` function is
|
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removed. Use ``django.utils.http.parse_header_parameters()`` instead.
|
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* :ttag:`{% blocktranslate asvar … %}<blocktranslate>` result is now marked as
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||
safe for (HTML) output purposes.
|
||
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* The ``autofocus`` HTML attribute in the admin search box is removed as it can
|
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be confusing for screen readers.
|
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* The :option:`makemigrations --check` option no longer creates missing
|
||
migration files.
|
||
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* The ``alias`` argument for :meth:`.Expression.get_group_by_cols` is removed.
|
||
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* The minimum supported version of ``sqlparse`` is increased from 0.2.2 to
|
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0.3.1.
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* The undocumented ``negated`` parameter of the
|
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:class:`~django.db.models.Exists` expression is removed.
|
||
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* The ``is_summary`` argument of the undocumented ``Query.add_annotation()``
|
||
method is removed.
|
||
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* The minimum supported version of SQLite is increased from 3.9.0 to 3.21.0.
|
||
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||
* The minimum supported version of ``asgiref`` is increased from 3.5.2 to
|
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3.6.0.
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* :class:`~django.contrib.auth.forms.UserCreationForm` now rejects usernames
|
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that differ only in case. If you need the previous behavior, use
|
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:class:`~django.contrib.auth.forms.BaseUserCreationForm` instead.
|
||
|
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* The minimum supported version of ``mysqlclient`` is increased from 1.4.0 to
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1.4.3.
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* The minimum supported version of ``argon2-cffi`` is increased from 19.1.0 to
|
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19.2.0.
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* The minimum supported version of ``Pillow`` is increased from 6.2.0 to 6.2.1.
|
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* The minimum supported version of ``jinja2`` is increased from 2.9.2 to
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2.11.0.
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* The minimum supported version of `redis-py`_ is increased from 3.0.0 to
|
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3.4.0.
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* Manually instantiated ``WSGIRequest`` objects must be provided a file-like
|
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object for ``wsgi.input``. Previously, Django was more lax than the expected
|
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behavior as specified by the WSGI specification.
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* Support for ``PROJ`` < 5 is removed.
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.. _`redis-py`: https://pypi.org/project/redis/
|
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|
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.. _deprecated-features-4.2:
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|
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Features deprecated in 4.2
|
||
==========================
|
||
|
||
``index_together`` option is deprecated in favor of ``indexes``
|
||
---------------------------------------------------------------
|
||
|
||
The :attr:`Meta.index_together <django.db.models.Options.index_together>`
|
||
option is deprecated in favor of the :attr:`~django.db.models.Options.indexes`
|
||
option.
|
||
|
||
Migrating existing ``index_together`` should be handled as a migration. For
|
||
example::
|
||
|
||
class Author(models.Model):
|
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rank = models.IntegerField()
|
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name = models.CharField(max_length=30)
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|
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class Meta:
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index_together = [["rank", "name"]]
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Should become::
|
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|
||
class Author(models.Model):
|
||
rank = models.IntegerField()
|
||
name = models.CharField(max_length=30)
|
||
|
||
class Meta:
|
||
indexes = [models.Index(fields=["rank", "name"])]
|
||
|
||
Running the :djadmin:`makemigrations` command will generate a migration
|
||
containing a :class:`~django.db.migrations.operations.RenameIndex` operation
|
||
which will rename the existing index.
|
||
|
||
The ``AlterIndexTogether`` migration operation is now officially supported only
|
||
for pre-Django 4.2 migration files. For backward compatibility reasons, it's
|
||
still part of the public API, and there's no plan to deprecate or remove it,
|
||
but it should not be used for new migrations. Use
|
||
:class:`~django.db.migrations.operations.AddIndex` and
|
||
:class:`~django.db.migrations.operations.RemoveIndex` operations instead.
|
||
|
||
Passing encoded JSON string literals to ``JSONField`` is deprecated
|
||
-------------------------------------------------------------------
|
||
|
||
``JSONField`` and its associated lookups and aggregates used to allow passing
|
||
JSON encoded string literals which caused ambiguity on whether string literals
|
||
were already encoded from database backend's perspective.
|
||
|
||
During the deprecation period string literals will be attempted to be JSON
|
||
decoded and a warning will be emitted on success that points at passing
|
||
non-encoded forms instead.
|
||
|
||
Code that use to pass JSON encoded string literals::
|
||
|
||
Document.objects.bulk_create(
|
||
Document(data=Value("null")),
|
||
Document(data=Value("[]")),
|
||
Document(data=Value('"foo-bar"')),
|
||
)
|
||
Document.objects.annotate(
|
||
JSONBAgg("field", default=Value("[]")),
|
||
)
|
||
|
||
Should become::
|
||
|
||
Document.objects.bulk_create(
|
||
Document(data=Value(None, JSONField())),
|
||
Document(data=[]),
|
||
Document(data="foo-bar"),
|
||
)
|
||
Document.objects.annotate(
|
||
JSONBAgg("field", default=[]),
|
||
)
|
||
|
||
From Django 5.1+ string literals will be implicitly interpreted as JSON string
|
||
literals.
|
||
|
||
Miscellaneous
|
||
-------------
|
||
|
||
* The ``BaseUserManager.make_random_password()`` method is deprecated. See
|
||
`recipes and best practices
|
||
<https://docs.python.org/3/library/secrets.html#recipes-and-best-practices>`_
|
||
for using Python's :py:mod:`secrets` module to generate passwords.
|
||
|
||
* The ``length_is`` template filter is deprecated in favor of :tfilter:`length`
|
||
and the ``==`` operator within an :ttag:`{% if %}<if>` tag. For example
|
||
|
||
.. code-block:: html+django
|
||
|
||
{% if value|length == 4 %}…{% endif %}
|
||
{% if value|length == 4 %}True{% else %}False{% endif %}
|
||
|
||
instead of:
|
||
|
||
.. code-block:: html+django
|
||
|
||
{% if value|length_is:4 %}…{% endif %}
|
||
{{ value|length_is:4 }}
|
||
|
||
* ``django.contrib.auth.hashers.SHA1PasswordHasher``,
|
||
``django.contrib.auth.hashers.UnsaltedSHA1PasswordHasher``, and
|
||
``django.contrib.auth.hashers.UnsaltedMD5PasswordHasher`` are deprecated.
|
||
|
||
* ``django.contrib.postgres.fields.CICharField`` is deprecated in favor of
|
||
``CharField(db_collation="…")`` with a case-insensitive non-deterministic
|
||
collation.
|
||
|
||
* ``django.contrib.postgres.fields.CIEmailField`` is deprecated in favor of
|
||
``EmailField(db_collation="…")`` with a case-insensitive non-deterministic
|
||
collation.
|
||
|
||
* ``django.contrib.postgres.fields.CITextField`` is deprecated in favor of
|
||
``TextField(db_collation="…")`` with a case-insensitive non-deterministic
|
||
collation.
|
||
|
||
* ``django.contrib.postgres.fields.CIText`` mixin is deprecated.
|
||
|
||
* The ``map_height`` and ``map_width`` attributes of ``BaseGeometryWidget`` are
|
||
deprecated, use CSS to size map widgets instead.
|
||
|
||
* ``SimpleTestCase.assertFormsetError()`` is deprecated in favor of
|
||
``assertFormSetError()``.
|
||
|
||
* ``TransactionTestCase.assertQuerysetEqual()`` is deprecated in favor of
|
||
``assertQuerySetEqual()``.
|
||
|
||
* Passing positional arguments to ``Signer`` and ``TimestampSigner`` is
|
||
deprecated in favor of keyword-only arguments.
|
||
|
||
* The ``DEFAULT_FILE_STORAGE`` setting is deprecated in favor of
|
||
``STORAGES["default"]``.
|
||
|
||
* The ``STATICFILES_STORAGE`` setting is deprecated in favor of
|
||
``STORAGES["staticfiles"]``.
|
||
|
||
* The ``django.core.files.storage.get_storage_class()`` function is deprecated.
|