559 lines
17 KiB
Plaintext
559 lines
17 KiB
Plaintext
============================================
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Django 2.0 release notes - UNDER DEVELOPMENT
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============================================
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Welcome to Django 2.0!
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These release notes cover the :ref:`new features <whats-new-2.0>`, as well as
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some :ref:`backwards incompatible changes <backwards-incompatible-2.0>` you'll
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want to be aware of when upgrading from Django 1.11 or earlier. We've
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:ref:`dropped some features<removed-features-2.0>` 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-2.0>`.
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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 2.0 supports Python 3.5+. Since Django 1.11, support for Python 2.7 and
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3.4 is removed. We **highly recommend** and only officially support the latest
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release of each series.
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Third-party library support for older version of Django
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=======================================================
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Following the release of Django 2.0, we suggest that third-party app authors
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drop support for all versions of Django prior to 1.11. At that time, you should
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be able run your package's tests using ``python -Wd`` so that deprecation
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warnings do appear. After making the deprecation warning fixes, your app should
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be compatible with Django 2.0.
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.. _whats-new-2.0:
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What's new in Django 2.0
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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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36,000 to 100,000.
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:mod:`django.contrib.contenttypes`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.gis`
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~~~~~~~~~~~~~~~~~~~~~~~~~
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* Added MySQL support for the
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:class:`~django.contrib.gis.db.models.functions.AsGeoJSON` function,
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:class:`~django.contrib.gis.db.models.functions.GeoHash` function,
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:class:`~django.contrib.gis.db.models.functions.IsValid` function, and
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:lookup:`isvalid` lookup.
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* Added the :class:`~django.contrib.gis.db.models.functions.Azimuth` and
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:class:`~django.contrib.gis.db.models.functions.LineLocatePoint` functions,
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supported on PostGIS and SpatiaLite.
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* Any :class:`~django.contrib.gis.geos.GEOSGeometry` imported from GeoJSON now
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has its SRID set.
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* Added the :attr:`.OSMWidget.default_zoom` attribute to customize the map's
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default zoom level.
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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 ``distinct`` argument for
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:class:`~django.contrib.postgres.aggregates.ArrayAgg` determines if
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concatenated values will be distinct.
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* The new :class:`~django.contrib.postgres.functions.RandomUUID` database
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function returns a version 4 UUID. It requires use of PostgreSQL's
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``pgcrypto`` extension which can be activated using the new
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:class:`~django.contrib.postgres.operations.CryptoExtension` migration
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operation.
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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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* Added the ``protocol`` keyword argument to the
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:class:`~django.contrib.sitemaps.GenericSitemap` constructor.
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:mod:`django.contrib.sites`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.staticfiles`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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:mod:`django.contrib.syndication`
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* ...
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Cache
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~~~~~
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* ...
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CSRF
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~~~~
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* ...
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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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* The new ``date_attrs`` and ``time_attrs`` arguments for
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:class:`~django.forms.SplitDateTimeWidget` and
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:class:`~django.forms.SplitHiddenDateTimeWidget` allow specifying different
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HTML attributes for the ``DateInput`` and ``TimeInput`` (or hidden)
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subwidgets.
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* The new :meth:`Form.errors.get_json_data()
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<django.forms.Form.errors.get_json_data>` method returns form errors as
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a dictionary suitable for including in a JSON response.
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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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Management Commands
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~~~~~~~~~~~~~~~~~~~
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* :djadmin:`inspectdb` now translates MySQL's unsigned integer columns to
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``PositiveIntegerField`` or ``PositiveSmallIntegerField``.
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* The new :option:`makemessages --add-location` option controls the comment
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format in PO files.
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* :djadmin:`loaddata` can now :ref:`read from stdin <loading-fixtures-stdin>`.
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* The new :option:`diffsettings --output` option allows formatting the output
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in a unified diff format.
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Migrations
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~~~~~~~~~~
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* ...
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Models
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~~~~~~
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* The new :class:`~django.db.models.functions.StrIndex` database function
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finds the starting index of a string inside another string.
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Requests and Responses
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~~~~~~~~~~~~~~~~~~~~~~
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* The :djadmin:`runserver` Web server supports HTTP 1.1.
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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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* To increase the usefulness of :meth:`.Engine.get_default` in third-party
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apps, it now returns the first engine if multiple ``DjangoTemplates`` engines
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are configured in ``TEMPLATES`` rather than raising ``ImproperlyConfigured``.
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* Custom template tags may now accept keyword-only arguments.
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Tests
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~~~~~
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* Added threading support to :class:`~django.test.LiveServerTestCase`.
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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-2.0:
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Backwards incompatible changes in 2.0
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=====================================
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Removed support for bytestrings in some places
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----------------------------------------------
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To support native Python 2 strings, older Django versions had to accept both
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bytestrings and unicode strings. Now that Python 2 support is dropped,
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bytestrings should only be encountered around input/output boundaries (handling
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of binary fields or HTTP streams, for example). You might have to update your
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code to limit bytestring usage to a minimum, as Django no longer accepts
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bytestrings in certain code paths.
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Database backend API
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--------------------
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* The ``DatabaseOperations.datetime_cast_date_sql()``,
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``datetime_cast_time_sql()``, ``datetime_trunc_sql()``, and
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``datetime_extract_sql()`` methods now return only the SQL to perform the
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operation instead of SQL and a list of parameters.
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* Third-party database backends should add a ``DatabaseWrapper.display_name``
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attribute with the name of the database that your backend works with. Django
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may use it in various messages, such as in system checks.
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Dropped support for Oracle 11.2
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-------------------------------
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The end of upstream support for Oracle 11.2 is Dec. 2020. Django 1.11 will be
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supported until April 2020 which almost reaches this date. Django 2.0
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officially supports Oracle 12.1+.
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Default MySQL isolation level is read committed
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-----------------------------------------------
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MySQL's default isolation level, repeatable read, may cause data loss in
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typical Django usage. To prevent that and for consistency with other databases,
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the default isolation level is now read committed. You can use the
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:setting:`DATABASES` setting to :ref:`use a different isolation level
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<mysql-isolation-level>`, if needed.
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:attr:`AbstractUser.last_name <django.contrib.auth.models.User.last_name>` ``max_length`` increased to 150
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----------------------------------------------------------------------------------------------------------
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A migration for :attr:`django.contrib.auth.models.User.last_name` is included.
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If you have a custom user model inheriting from ``AbstractUser``, you'll need
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to generate and apply a database migration for your user model.
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If you want to preserve the 30 character limit for last names, use a custom
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form::
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from django.contrib.auth.forms import UserChangeForm
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class MyUserChangeForm(UserChangeForm):
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last_name = forms.CharField(max_length=30, required=False)
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If you wish to keep this restriction in the admin when editing users, set
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``UserAdmin.form`` to use this form::
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from django.contrib.auth.admin import UserAdmin
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from django.contrib.auth.models import User
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class MyUserAdmin(UserAdmin):
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form = MyUserChangeForm
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admin.site.unregister(User)
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admin.site.register(User, MyUserAdmin)
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Miscellaneous
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-------------
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* The ``SessionAuthenticationMiddleware`` class is removed. It provided no
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functionality since session authentication is unconditionally enabled in
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Django 1.10.
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* The default HTTP error handlers (``handler404``, etc.) are now callables
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instead of dotted Python path strings. Django favors callable references
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since they provide better performance and debugging experience.
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* :class:`~django.views.generic.base.RedirectView` no longer silences
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``NoReverseMatch`` if the ``pattern_name`` doesn't exist.
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* When :setting:`USE_L10N` is off, :class:`~django.forms.FloatField` and
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:class:`~django.forms.DecimalField` now respect :setting:`DECIMAL_SEPARATOR`
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and :setting:`THOUSAND_SEPARATOR` during validation. For example, with the
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settings::
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USE_L10N = False
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USE_THOUSAND_SEPARATOR = True
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DECIMAL_SEPARATOR = ','
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THOUSAND_SEPARATOR = '.'
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an input of ``"1.345"`` is now converted to ``1345`` instead of ``1.345``.
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* Subclasses of :class:`~django.contrib.auth.models.AbstractBaseUser` are no
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longer required to implement ``get_short_name()`` and ``get_full_name()``.
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(The base implementations that raise ``NotImplementedError`` are removed.)
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``django.contrib.admin`` uses these methods if implemented but doesn't
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require them. Third-party apps that use these methods may want to adopt a
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similar approach.
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* The ``FIRST_DAY_OF_WEEK`` and ``NUMBER_GROUPING`` format settings are now
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kept as integers in JavaScript and JSON i18n view outputs.
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* :meth:`~django.test.TransactionTestCase.assertNumQueries` now ignores
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connection configuration queries. Previously, if a test opened a new database
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connection, those queries could be included as part of the
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``assertNumQueries()`` count.
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* The ``PASSWORD_RESET_TIMEOUT_DAYS`` setting is more properly respected in
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``contrib.auth`` password reset. Previously, resets were allowed for one day
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longer than expected. For example, with the default of
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``PASSWORD_RESET_TIMEOUT_DAYS = 3``, password reset tokens are now valid for
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72 hours rather than 96 hours.
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.. _deprecated-features-2.0:
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Features deprecated in 2.0
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==========================
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Miscellaneous
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-------------
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* The ``django.db.backends.postgresql_psycopg2`` module is deprecated in favor
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of ``django.db.backends.postgresql``. It's been an alias since Django 1.9.
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This only affects code that imports from the module directly. The
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``DATABASES`` setting can still use
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``'django.db.backends.postgresql_psycopg2'``, though you can simplify that by
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using the ``'django.db.backends.postgresql'`` name added in Django 1.9.
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* ``django.shortcuts.render_to_response()`` is deprecated in favor of
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:func:`django.shortcuts.render`. ``render()`` takes the same arguments
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except that is also requires a ``request``.
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* The ``DEFAULT_CONTENT_TYPE`` setting is deprecated. It doesn't interact well
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well with third-party apps and is obsolete since HTML5 has mostly superseded
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XHTML.
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* ``HttpRequest.xreadlines()`` is deprecated in favor of iterating over the
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request.
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.. _removed-features-2.0:
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Features removed in 2.0
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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 2.0. See :ref:`deprecated-features-1.9` and
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:ref:`deprecated-features-1.10` for details, including how to remove usage of
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these features.
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* The ``weak`` argument to ``django.dispatch.signals.Signal.disconnect()`` is
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removed.
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* ``django.db.backends.base.BaseDatabaseOperations.check_aggregate_support()``
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is removed.
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* The ``django.forms.extras`` package is removed.
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* The ``assignment_tag`` helper is removed.
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* The ``host`` argument to ``SimpleTestCase.assertsRedirects()`` is removed.
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The compatibility layer which allows absolute URLs to be considered equal to
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relative ones when the path is identical is also removed.
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* ``Field.rel`` and ``Field.remote_field.to`` are removed.
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* The ``on_delete`` argument for ``ForeignKey`` and ``OneToOneField`` are now
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required.
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* ``django.db.models.fields.add_lazy_relation()`` is removed.
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* When time zone support is enabled, database backends that don't support time
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zones no longer convert aware datetimes to naive values in UTC anymore when
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such values are passed as parameters to SQL queries executed outside of the
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ORM, e.g. with ``cursor.execute()``.
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* ``django.contrib.auth.tests.utils.skipIfCustomUser()`` is removed.
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* The ``GeoManager`` and ``GeoQuerySet`` classes are removed.
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* The ``django.contrib.gis.geoip`` module is removed.
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* The ``supports_recursion`` check for template loaders is removed from:
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* ``django.template.engine.Engine.find_template()``
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* ``django.template.loader_tags.ExtendsNode.find_template()``
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* ``django.template.loaders.base.Loader.supports_recursion()``
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* ``django.template.loaders.cached.Loader.supports_recursion()``
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* The ``load_template`` and ``load_template_sources`` template loader methods
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are removed.
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* The ``template_dirs`` argument for template loaders is removed:
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* ``django.template.loaders.base.Loader.get_template()``
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* ``django.template.loaders.cached.Loader.cache_key()``
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* ``django.template.loaders.cached.Loader.get_template()``
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* ``django.template.loaders.cached.Loader.get_template_sources()``
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* ``django.template.loaders.filesystem.Loader.get_template_sources()``
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* ``django.template.loaders.base.Loader.__call__()`` is removed.
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* Support for custom error views that don't accept an ``exception`` parameter
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is removed.
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* The ``mime_type`` attribute of ``django.utils.feedgenerator.Atom1Feed`` and
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``django.utils.feedgenerator.RssFeed`` is removed.
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* The ``app_name`` argument to ``include()`` is removed.
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* Support for passing a 3-tuple (including ``admin.site.urls``) as the first
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argument to ``include()`` is removed.
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* Support for setting a URL instance namespace without an application namespace
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is removed.
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* ``Field._get_val_from_obj()`` is removed.
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* ``django.template.loaders.eggs.Loader`` is removed.
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* The ``current_app`` parameter to the ``contrib.auth`` function-based views is
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removed.
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* The ``callable_obj`` keyword argument to
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``SimpleTestCase.assertRaisesMessage()`` is removed.
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* Support for the ``allow_tags`` attribute on ``ModelAdmin`` methods is
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removed.
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* The ``enclosure`` keyword argument to ``SyndicationFeed.add_item()`` is
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removed.
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* The ``django.template.loader.LoaderOrigin`` and
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``django.template.base.StringOrigin`` aliases for
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``django.template.base.Origin`` are removed.
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* The ``makemigrations --exit`` option is removed.
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* Support for direct assignment to a reverse foreign key or many-to-many
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relation is removed.
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* The ``get_srid()`` and ``set_srid()`` methods of
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``django.contrib.gis.geos.GEOSGeometry`` are removed.
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* The ``get_x()``, ``set_x()``, ``get_y()``, ``set_y()``, ``get_z()``, and
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``set_z()`` methods of ``django.contrib.gis.geos.Point`` are removed.
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* The ``get_coords()`` and ``set_coords()`` methods of
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``django.contrib.gis.geos.Point`` are removed.
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* The ``cascaded_union`` property of ``django.contrib.gis.geos.MultiPolygon``
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is removed.
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* ``django.utils.functional.allow_lazy()`` is removed.
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* The ``shell --plain`` option is removed.
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* The ``django.core.urlresolvers`` module is removed.
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* ``CommaSeparatedIntegerField`` is removed, except for support in historical
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migrations.
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* The template ``Context.has_key()`` method is removed.
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* Support for the ``django.core.files.storage.Storage.accessed_time()``,
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``created_time()``, and ``modified_time()`` methods is removed.
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* Support for query lookups using the model name when
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``Meta.default_related_name`` is set is removed.
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* The MySQL ``__search`` lookup is removed.
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* The shim for supporting custom related manager classes without a
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``_apply_rel_filters()`` method is removed.
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* Using ``User.is_authenticated()`` and ``User.is_anonymous()`` as methods
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rather than properties is no longer supported.
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* The ``Model._meta.virtual_fields`` attribute is removed.
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* The keyword arguments ``virtual_only`` in ``Field.contribute_to_class()`` and
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``virtual`` in ``Model._meta.add_field()`` are removed.
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* The ``javascript_catalog()`` and ``json_catalog()`` views are removed.
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* ``django.contrib.gis.utils.precision_wkt()`` is removed.
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* In multi-table inheritance, implicit promotion of a ``OneToOneField`` to a
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``parent_link`` is removed.
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* Support for ``Widget._format_value()`` is removed.
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* ``FileField`` methods ``get_directory_name()`` and ``get_filename()`` are
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removed.
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* The ``mark_for_escaping()`` function and the classes it uses: ``EscapeData``,
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``EscapeBytes``, ``EscapeText``, ``EscapeString``, and ``EscapeUnicode`` are
|
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removed.
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* The ``escape`` filter now uses ``django.utils.html.conditional_escape()``.
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* ``Manager.use_for_related_fields`` is removed.
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* Model ``Manager`` inheritance follows MRO inheritance rules. The requirement
|
|
to use ``Meta.manager_inheritance_from_future`` to opt-in to the behavior is
|
|
removed.
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* Support for old-style middleware using ``settings.MIDDLEWARE_CLASSES`` is
|
|
removed.
|