============================================ Django 3.0 release notes - UNDER DEVELOPMENT ============================================ *Expected December 2019* Welcome to Django 3.0! These release notes cover the :ref:`new features `, as well as some :ref:`backwards incompatible changes ` you'll want to be aware of when upgrading from Django 2.2 or earlier. We've :ref:`dropped some features` that have reached the end of their deprecation cycle, and we've :ref:`begun the deprecation process for some features `. See the :doc:`/howto/upgrade-version` guide if you're updating an existing project. Python compatibility ==================== Django 3.0 supports Python 3.6, 3.7, and 3.8. We **highly recommend** and only officially support the latest release of each series. The Django 2.2.x series is the last to support Python 3.5. Third-party library support for older version of Django ======================================================= Following the release of Django 3.0, we suggest that third-party app authors drop support for all versions of Django prior to 2.2. At that time, you should be able to run your package's tests using ``python -Wd`` so that deprecation warnings appear. After making the deprecation warning fixes, your app should be compatible with Django 3.0. .. _whats-new-3.0: What's new in Django 3.0 ======================== Minor features -------------- :mod:`django.contrib.admin` ~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.admindocs` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.auth` ~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.contenttypes` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.gis` ~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.messages` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.postgres` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.redirects` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.sessions` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.sitemaps` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.sites` ~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.staticfiles` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... :mod:`django.contrib.syndication` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * ... Cache ~~~~~ * ... CSRF ~~~~ * ... Email ~~~~~ * ... File Storage ~~~~~~~~~~~~ * ... File Uploads ~~~~~~~~~~~~ * ... Forms ~~~~~ * ... Generic Views ~~~~~~~~~~~~~ * ... Internationalization ~~~~~~~~~~~~~~~~~~~~ * ... Management Commands ~~~~~~~~~~~~~~~~~~~ * The new :option:`compilemessages --ignore` option allows ignoring specific directories when searching for ``.po`` files to compile. Migrations ~~~~~~~~~~ * ... Models ~~~~~~ * ... Requests and Responses ~~~~~~~~~~~~~~~~~~~~~~ * ... Serialization ~~~~~~~~~~~~~ * ... Signals ~~~~~~~ * ... Templates ~~~~~~~~~ * ... Tests ~~~~~ * ... URLs ~~~~ * ... Validators ~~~~~~~~~~ * ... .. _backwards-incompatible-3.0: Backwards incompatible changes in 3.0 ===================================== Database backend API -------------------- This section describes changes that may be needed in third-party database backends. * The second argument of ``DatabaseIntrospection.get_geometry_type()`` is now the row description instead of the column name. * ``DatabaseIntrospection.get_field_type()`` may no longer return tuples. * If the database can create foreign keys in the same SQL statement that adds a field, add ``SchemaEditor.sql_create_column_inline_fk`` with the appropriate SQL; otherwise, set ``DatabaseFeatures.can_create_inline_fk = False``. * ``DatabaseFeatures.can_return_id_from_insert`` and ``can_return_ids_from_bulk_insert`` are renamed to ``can_return_columns_from_insert`` and ``can_return_rows_from_bulk_insert``. :mod:`django.contrib.gis` ------------------------- * Supported for PostGIS 2.1 is removed. * Support for SpatiaLite 4.1 and 4.2 is removed. Dropped support for PostgreSQL 9.4 ---------------------------------- Upstream support for PostgreSQL 9.4 ends in December 2019. Django 3.0 supports PostgreSQL 9.5 and higher. Removed private Python 2 compatibility APIs ------------------------------------------- While Python 2 support was removed in Django 2.0, some private APIs weren't removed from Django so that third party apps could continue using them until the Python 2 end-of-life. Since we expect apps to drop Python 2 compatibility when adding support for Django 3.0, we're removing these APIs at this time. * ``django.test.utils.str_prefix()`` - Strings don't have 'u' prefixes in Python 3. * ``django.test.utils.patch_logger()`` - Use :meth:`unittest.TestCase.assertLogs` instead. * ``django.utils.lru_cache.lru_cache()`` - Alias of :func:`functools.lru_cache`. * ``django.utils.decorators.available_attrs()`` - This function returns ``functools.WRAPPER_ASSIGNMENTS``. Miscellaneous ------------- * ... .. _deprecated-features-3.0: Features deprecated in 3.0 ========================== Miscellaneous ------------- * ``django.utils.http.urlquote()``, ``urlquote_plus()``, ``urlunquote()``, and ``urlunquote_plus()`` are deprecated in favor of the functions that they're aliases for: :func:`urllib.parse.quote`, :func:`~urllib.parse.quote_plus`, :func:`~urllib.parse.unquote`, and :func:`~urllib.parse.unquote_plus`. .. _removed-features-3.0: Features removed in 3.0 ======================= These features have reached the end of their deprecation cycle and are removed in Django 3.0. See :ref:`deprecated-features-2.0` for details on these changes, including how to remove usage of these features. * The ``django.db.backends.postgresql_psycopg2`` module is removed. * ``django.shortcuts.render_to_response()`` is removed. * The ``DEFAULT_CONTENT_TYPE`` setting is removed. * ``HttpRequest.xreadlines()`` is removed. * Support for the ``context`` argument of ``Field.from_db_value()`` and ``Expression.convert_value()`` is removed. * The ``field_name`` keyword argument of ``QuerySet.earliest()` and ``latest()`` is removed. See :ref:`deprecated-features-2.1` for details on these changes, including how to remove usage of these features. * The ``ForceRHR`` GIS function is removed. * ``django.utils.http.cookie_date()`` is removed. * The ``staticfiles`` and ``admin_static`` template tag libraries are removed. * ``django.contrib.staticfiles.templatetags.staticfiles.static()`` is removed.