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421 lines
12 KiB
Plaintext
============================================
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Django 2.1 release notes - UNDER DEVELOPMENT
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============================================
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Welcome to Django 2.1!
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These release notes cover the :ref:`new features <whats-new-2.1>`, as well as
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some :ref:`backwards incompatible changes <backwards-incompatible-2.1>` you'll
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want to be aware of when upgrading from Django 2.0 or earlier. We've
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:ref:`dropped some features<removed-features-2.1>` that have reached the end of
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their deprecation cycle, and we've :ref:`begun the deprecation process for some
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features <deprecated-features-2.1>`.
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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 2.1 supports Python 3.5, 3.6, and 3.7. Django 2.0 is the last version to
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support Python 3.4. We **highly recommend** and only officially support the
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latest release of each series.
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.. _whats-new-2.1:
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What's new in Django 2.1
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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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* :attr:`.ModelAdmin.search_fields` now accepts any lookup such as
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``field__exact``.
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* jQuery is upgraded from version 2.2.3 to 3.2.1.
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* The new :meth:`.ModelAdmin.delete_queryset` method allows customizing the
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deletion process of the "delete selected objects" action.
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* You can now :ref:`override the the default admin site
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<overriding-default-admin-site>`.
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* The new :attr:`.ModelAdmin.sortable_by` attribute and
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:meth:`.ModelAdmin.get_sortable_by` method allow limiting the columns that
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can be sorted in the change list page.
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* The ``admin_order_field`` attribute for elements in
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:attr:`.ModelAdmin.list_display` may now be a query expression.
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* The new :meth:`.ModelAdmin.get_deleted_objects()` method allows customizing
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the deletion process of the delete view and the "delete selected" action.
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* The ``actions.html``, ``change_list_results.html``, ``date_hierarchy.html``,
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``pagination.html``, ``prepopulated_fields_js.html``, ``search_form.html``,
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and ``submit_line.html`` templates can now be :ref:`overridden per app or
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per model <admin-templates-overridden-per-app-or-model>` (besides overridden
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globally).
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* The admin change list and change form object tools can now be :ref:`overridden
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per app, per model, or globally <admin-templates-overridden-per-app-or-model>`
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with ``change_list_object_tools.html`` and
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``change_form_object_tools.html`` templates.
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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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* :djadmin:`createsuperuser` now gives a prompt to allow bypassing the
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:setting:`AUTH_PASSWORD_VALIDATORS` checks.
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* :class:`~django.contrib.auth.forms.UserCreationForm` and
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:class:`~django.contrib.auth.forms.UserChangeForm` no longer need to be
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rewritten for a custom user model.
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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.buffer_with_style` method is a version of
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:meth:`~.GEOSGeometry.buffer` that allows customizing the style of the
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buffer.
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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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* ...
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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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* ...
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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 :ref:`local-memory cache backend <local-memory-caching>` now uses a
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least-recently-used (LRU) culling strategy rather than a pseudo-random one.
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CSRF
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~~~~
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* ...
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Database backends
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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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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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* Added the :meth:`~django.utils.translation.get_supported_language_variant`
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function.
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* Untranslated strings for territorial language variants now use the
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translations of the generic language. For example, untranslated ``pt_BR``
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strings use ``pt`` translations.
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Management Commands
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~~~~~~~~~~~~~~~~~~~
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* The new :option:`inspectdb --include-views` option allows creating models
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for database views.
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Migrations
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~~~~~~~~~~
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* Added support for serialization of ``functools.partialmethod`` objects.
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Models
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~~~~~~
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* Models can now use ``__init_subclass__()`` from :pep:`487`.
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* A ``BinaryField`` may now be set to ``editable=True`` if you wish to include
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it in model forms.
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* A number of new text database functions are added:
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:class:`~django.db.models.functions.Chr`,
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:class:`~django.db.models.functions.Left`,
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:class:`~django.db.models.functions.LPad`,
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:class:`~django.db.models.functions.LTrim`,
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:class:`~django.db.models.functions.Ord`,
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:class:`~django.db.models.functions.Replace`,
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:class:`~django.db.models.functions.Right`,
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:class:`~django.db.models.functions.RPad`,
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:class:`~django.db.models.functions.RTrim`, and
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:class:`~django.db.models.functions.Trim`.
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* The new :class:`~django.db.models.functions.TruncWeek` function truncates
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:class:`~django.db.models.DateField` and
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:class:`~django.db.models.DateTimeField` to the Monday of a week.
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* Query expressions can now be negated using a minus sign.
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* :meth:`.QuerySet.order_by` and :meth:`distinct(*fields) <.QuerySet.distinct>`
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now support using field transforms.
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Requests and Responses
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~~~~~~~~~~~~~~~~~~~~~~
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* Added :meth:`.HttpRequest.get_full_path_info`.
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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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* The new :tfilter:`json_script` filter safely outputs a Python object as JSON,
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wrapped in a ``<script>`` tag, ready for use with JavaScript.
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Tests
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~~~~~
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* Added test :class:`~django.test.Client` support for 307 and 308 redirects.
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* The test :class:`~django.test.Client` now serializes a request data
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dictionary as JSON if ``content_type='application/json'``. You can customize
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the JSON encoder with test client's ``json_encoder`` parameter.
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URLs
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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-2.1:
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Backwards incompatible changes in 2.1
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=====================================
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Database backend API
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--------------------
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* To adhere to :pep:`249`, exceptions where a database doesn't support a
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feature are changed from :exc:`NotImplementedError` to
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:exc:`django.db.NotSupportedError`.
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* Renamed the ``allow_sliced_subqueries`` database feature flag to
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``allow_sliced_subqueries_with_in``.
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* ``DatabaseOperations.distinct_sql()`` now requires an additional ``params``
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argument and returns a tuple of SQL and parameters instead of a SQL string.
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:mod:`django.contrib.gis`
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-------------------------
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* Support for SpatiaLite 4.0 is removed.
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Dropped support for MySQL 5.5
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-----------------------------
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The end of upstream support for MySQL 5.5 is December 2018. Django 2.1 supports
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MySQL 5.6 and higher.
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Dropped support for PostgreSQL 9.3
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----------------------------------
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The end of upstream support for PostgreSQL 9.3 is September 2018. Django 2.1
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supports PostgreSQL 9.4 and higher.
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Removed ``BCryptPasswordHasher`` from the default ``PASSWORD_HASHERS`` setting
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------------------------------------------------------------------------------
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If you used bcrypt with Django 1.4 or 1.5 (before ``BCryptSHA256PasswordHasher``
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was added in Django 1.6), you might have some passwords that use the
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``BCryptPasswordHasher`` hasher.
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You can check if that's the case like this::
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from django.contrib.auth import get_user_model
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User = get_user_model()
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User.objects.filter(password__startswith='bcrypt$$')
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If you want to continue to allow those passwords to be used, you'll
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have to define the :setting:`PASSWORD_HASHERS` setting (if you don't already)
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and include ``'django.contrib.auth.hashers.BCryptPasswordHasher'``.
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Moved ``wrap_label`` widget template context variable
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-----------------------------------------------------
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To fix the lack of ``<label>`` when using ``RadioSelect`` and
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``CheckboxSelectMultiple`` with ``MultiWidget``, the ``wrap_label`` context
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variable now appears as an attribute of each option. For example, in a custom
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``input_option.html`` template, change ``{% if wrap_label %}`` to
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``{% if widget.wrap_label %}``.
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Miscellaneous
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-------------
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* The minimum supported version of ``mysqlclient`` is increased from 1.3.3 to
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1.3.7.
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* The date format of ``Set-Cookie``'s ``Expires`` directive is changed to
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follow :rfc:`7231#section-7.1.1.1` instead of Netscape's cookie standard.
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Hyphens present in dates like ``Tue, 25-Dec-2018 22:26:13 GMT`` are removed.
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This change should be merely cosmetic except perhaps for antiquated browsers
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that don't parse the new format.
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* ``allowed_hosts`` is now a required argument of private API
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``django.utils.http.is_safe_url()``.
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* The ``multiple`` attribute rendered by the
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:class:`~django.forms.SelectMultiple` widget now uses HTML5 boolean syntax
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rather than XHTML's ``multiple="multiple"``.
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* HTML rendered by form widgets no longer includes a closing slash on void
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elements, e.g. ``<br>``. This is incompatible within XHTML, although some
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widgets already used aspects of HTML5 such as boolean attributes.
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* The value of :class:`~django.forms.SelectDateWidget`'s empty options is
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changed from 0 to an empty string, which mainly may require some adjustments
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in tests that compare HTML.
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.. _deprecated-features-2.1:
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Features deprecated in 2.1
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==========================
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Miscellaneous
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-------------
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* The ``ForceRHR`` GIS function is deprecated in favor of the new
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:class:`~django.contrib.gis.db.models.functions.ForcePolygonCW` function.
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* ``django.utils.http.cookie_date()`` is deprecated in favor of
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:func:`~django.utils.http.http_date`, which follows the format of the latest
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RFC.
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* ``{% load staticfiles %}`` and ``{% load admin_static %}`` are deprecated
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in favor of ``{% load static %}``, which works the same.
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* ``django.contrib.staticfiles.templatetags.static()`` is deprecated in favor
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of ``django.templatetags.static.static()``.
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.. _removed-features-2.1:
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Features removed in 2.1
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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 2.1. See :ref:`deprecated-features-1.11` for details, including how
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to remove usage of these features.
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in Django 2.1. See :ref:`deprecated-features-1.11` and for details, including
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how to remove usage of these features.
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* ``contrib.auth.views.login()``, ``logout()``, ``password_change()``,
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``password_change_done()``, ``password_reset()``, ``password_reset_done()``,
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``password_reset_confirm()``, and ``password_reset_complete()`` are removed.
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* The ``extra_context`` parameter of ``contrib.auth.views.logout_then_login()``
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is removed.
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* ``django.test.runner.setup_databases()`` is removed.
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* ``django.utils.translation.string_concat()`` is removed.
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* ``django.core.cache.backends.memcached.PyLibMCCache`` no longer supports
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passing ``pylibmc`` behavior settings as top-level attributes of ``OPTIONS``.
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* The ``host`` parameter of ``django.utils.http.is_safe_url()`` is removed.
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* Silencing of exceptions raised while rendering the ``{% include %}`` template
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tag is removed.
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* ``DatabaseIntrospection.get_indexes()`` is removed.
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* The ``authenticate()`` method of authentication backends requires ``request``
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as the first positional argument.
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* The ``django.db.models.permalink()`` decorator is removed.
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* The ``USE_ETAGS`` setting is removed. ``CommonMiddleware`` and
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``django.utils.cache.patch_response_headers()`` no longer set ETags.
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* The ``Model._meta.has_auto_field`` attribute is removed.
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* Support for regular expression groups with ``iLmsu#`` in ``url()`` is removed.
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* Support for ``Widget.render()`` methods without the ``renderer`` argument
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is removed.
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