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Changelog

1.11.1

===========================

May 6, 2017

Django 1.11.1 adds a minor feature and fixes several bugs in 1.11.

Allowed disabling server-side cursors on PostgreSQL

The change in Django 1.11 to make :meth:.QuerySet.iterator() use server-side
cursors on PostgreSQL prevents running Django with pgBouncer in transaction
pooling mode. To reallow that, use the :setting:DISABLE_SERVER_SIDE_CURSORS <DATABASE-DISABLE_SERVER_SIDE_CURSORS> setting in :setting:DATABASES.

See :ref:transaction-pooling-server-side-cursors for more discussion.

Bugfixes

• Made migrations respect Index’s name argument. If you created a
  named index with Django 1.11, makemigrations will create a migration to
  recreate the index with the correct name (:ticket:28051).

• Fixed a crash when using a __icontains lookup on a ArrayField
  (:ticket:28038).

• Fixed a crash when using a two-tuple in EmailMessage’s attachments
  argument (:ticket:28042).

• Fixed QuerySet.filter() crash when it references the name of a
  OneToOneField primary key (:ticket:28047).

• Fixed empty POST data table appearing instead of "No POST data" in HTML debug
  page (:ticket:28079).

• Restored BoundField\s without any choices evaluating to True
  (:ticket:28058).

• Prevented SessionBase.cycle_key() from losing session data if
  _session_cache isn't populated (:ticket:28066).

• Fixed layout of ReadOnlyPasswordHashWidget (used in the admin's user
  change page) (:ticket:28097).

• Allowed prefetch calls on managers with custom ModelIterable subclasses
  (:ticket:28096).

• Fixed change password link in the contrib.auth admin for el,
  es_MX, and pt translations (:ticket:28100).

• Restored the output of the class attribute in the <ul> of widgets
  that use the multiple_input.html template. This fixes
  ModelAdmin.radio_fields with admin.HORIZONTAL (:ticket:28059).

• Fixed crash in BaseGeometryWidget.subwidgets() (:ticket:28039).

• Fixed exception reraising in ORM query execution when cursor.execute()
  fails and the subsequent cursor.close() also fails (:ticket:28091).

• Fixed a regression where CheckboxSelectMultiple, NullBooleanSelect,
  RadioSelect, SelectMultiple, and Select localized option values
  (:ticket:28075).

• Corrected the stack level of unordered queryset pagination warnings
  (:ticket:28109).

• Fixed a regression causing incorrect queries for __in subquery lookups
  when models use ForeignKey.to_field (:ticket:28101).

• Fixed crash when overriding the template of
  django.views.static.directory_index() (:ticket:28122).

• Fixed a regression in formset min_num validation with unchanged forms
  that have initial data (:ticket:28130).

• Prepared for cx_Oracle 6.0 support (:ticket:28138).

• Updated the contrib.postgres SplitArrayWidget to use template-based
  widget rendering (:ticket:28040).

• Fixed crash in BaseGeometryWidget.get_context() when overriding existing
  attrs (:ticket:28105).

• Prevented AddIndex and RemoveIndex from mutating model state
  (:ticket:28043).

• Prevented migrations from dropping database indexes from Meta.indexes
  when changing Field.db_index to False (:ticket:28052).

• Fixed a regression in choice ordering in form fields with grouped and
  non-grouped options (:ticket:28157).

• Fixed crash in BaseInlineFormSet._construct_form() when using
  save_as_new (:ticket:28159).

• Fixed a regression where Model._state.db wasn't set correctly on
  multi-table inheritance parent models after saving a child model
  (:ticket:28166).

• Corrected the return type of ArrayField(CITextField()) values retrieved
  from the database (:ticket:28161).

• Fixed QuerySet.prefetch_related() crash when fetching relations in nested
  Prefetch objects (:ticket:27554).

• Prevented hiding GDAL errors if it's not installed when using contrib.gis
  (:ticket:28160). (It's a required dependency as of Django 1.11.)

• Fixed a regression causing __in lookups on a foreign key to fail when
  using the foreign key's parent model as the lookup value (:ticket:28175).

=========================

1.11

=========================

April 4, 2017

Welcome to Django 1.11!

These release notes cover the :ref:new features <whats-new-1.11>, as well as
some :ref:backwards incompatible changes <backwards-incompatible-1.11> you'll
want to be aware of when upgrading from Django 1.10 or older versions. We've
:ref:begun the deprecation process for some features <deprecated-features-1.11>.

See the :doc:/howto/upgrade-version guide if you're updating an existing
project.

Django 1.11 is designated as a :term:long-term support release. It will
receive security updates for at least three years after its release. Support
for the previous LTS, Django 1.8, will end in April 2018.

Python compatibility

Django 1.11 requires Python 2.7, 3.4, 3.5, or 3.6. Django 1.11 is the first
release to support Python 3.6. We highly recommend and only officially
support the latest release of each series.

The Django 1.11.x series is the last to support Python 2. The next major
release, Django 2.0, will only support Python 3.5+.

Deprecating warnings are no longer loud by default

Unlike older versions of Django, Django's own deprecation warnings are no
longer displayed by default. This is consistent with Python's default behavior.

This change allows third-party apps to support both Django 1.11 LTS and Django
1.8 LTS without having to add code to avoid deprecation warnings.

Following the release of Django 2.0, we suggest that third-party app authors
drop support for all versions of Django prior to 1.11. At that time, you should
be able run your package's tests using python -Wd so that deprecation
warnings do appear. After making the deprecation warning fixes, your app should
be compatible with Django 2.0.

.. _whats-new-1.11:

What's new in Django 1.11

Class-based model indexes

The new :mod:django.db.models.indexes module contains classes which ease
creating database indexes. Indexes are added to models using the
:attr:Meta.indexes <django.db.models.Options.indexes> option.

The :class:~django.db.models.Index class creates a b-tree index, as if you
used :attr:~django.db.models.Field.db_index on the model field or
:attr:~django.db.models.Options.index_together on the model Meta class.
It can be subclassed to support different index types, such as
:class:~django.contrib.postgres.indexes.GinIndex. It also allows defining the
order (ASC/DESC) for the columns of the index.

Template-based widget rendering

To ease customizing widgets, form widget rendering is now done using the
template system rather than in Python. See :doc:/ref/forms/renderers.

You may need to adjust any custom widgets that you've written for a few
:ref:backwards incompatible changes <template-widget-incompatibilities-1-11>.

Subquery expressions

The new :class:~django.db.models.Subquery and
:class:~django.db.models.Exists database expressions allow creating
explicit subqueries. Subqueries may refer to fields from the outer queryset
using the :class:~django.db.models.OuterRef class.

Minor features

:mod:django.contrib.admin

• :attr:.ModelAdmin.date_hierarchy can now reference fields across relations.

• The new :meth:ModelAdmin.get_exclude() <django.contrib.admin.ModelAdmin.get_exclude> hook allows specifying the
  exclude fields based on the request or model instance.

• The popup_response.html template can now be overridden per app, per
  model, or by setting the :attr:.ModelAdmin.popup_response_template
  attribute.

:mod:django.contrib.auth

• The default iteration count for the PBKDF2 password hasher is increased by
  20%.

• The :class:~django.contrib.auth.views.LoginView and
  :class:~django.contrib.auth.views.LogoutView class-based views supersede the
  deprecated login() and logout() function-based views.

• The :class:~django.contrib.auth.views.PasswordChangeView,
  :class:~django.contrib.auth.views.PasswordChangeDoneView,
  :class:~django.contrib.auth.views.PasswordResetView,
  :class:~django.contrib.auth.views.PasswordResetDoneView,
  :class:~django.contrib.auth.views.PasswordResetConfirmView, and
  :class:~django.contrib.auth.views.PasswordResetCompleteView class-based
  views supersede the deprecated password_change(),
  password_change_done(), password_reset(), password_reset_done(),
  password_reset_confirm(), and password_reset_complete() function-based
  views.

• The new post_reset_login attribute for
  :class:~django.contrib.auth.views.PasswordResetConfirmView allows
  automatically logging in a user after a successful password reset.
  If you have multiple AUTHENTICATION_BACKENDS configured, use the
  post_reset_login_backend attribute to choose which one to use.

• To avoid the possibility of leaking a password reset token via the HTTP
  Referer header (for example, if the reset page includes a reference to CSS or
  JavaScript hosted on another domain), the
  :class:~django.contrib.auth.views.PasswordResetConfirmView (but not the
  deprecated password_reset_confirm() function-based view) stores the token
  in a session and redirects to itself to present the password change form to
  the user without the token in the URL.

• :func:~django.contrib.auth.update_session_auth_hash now rotates the session
  key to allow a password change to invalidate stolen session cookies.

• The new success_url_allowed_hosts attribute for
  :class:~django.contrib.auth.views.LoginView and
  :class:~django.contrib.auth.views.LogoutView allows specifying a set of
  hosts that are safe for redirecting after login and logout.

• Added password validators help_text to
  :class:~django.contrib.auth.forms.UserCreationForm.

• The HttpRequest is now passed to :func:~django.contrib.auth.authenticate
  which in turn passes it to the authentication backend if it accepts a
  request argument.

• The :func:~django.contrib.auth.signals.user_login_failed signal now
  receives a request argument.

• :class:~django.contrib.auth.forms.PasswordResetForm supports custom user
  models that use an email field named something other than 'email'.
  Set :attr:CustomUser.EMAIL_FIELD <django.contrib.auth.models.CustomUser.EMAIL_FIELD> to the name of the field.

• :func:~django.contrib.auth.get_user_model can now be called at import time,
  even in modules that define models.

:mod:django.contrib.contenttypes

• When stale content types are detected in the
  :djadmin:remove_stale_contenttypes command, there's now a list of related
  objects such as auth.Permission\s that will also be deleted. Previously,
  only the content types were listed (and this prompt was after migrate
  rather than in a separate command).

:mod:django.contrib.gis

• The new :meth:.GEOSGeometry.from_gml and :meth:.OGRGeometry.from_gml
  methods allow creating geometries from GML.

• Added support for the :lookup:dwithin lookup on SpatiaLite.

• The :class:~django.contrib.gis.db.models.functions.Area function,
  :class:~django.contrib.gis.db.models.functions.Distance function, and
  distance lookups now work with geodetic coordinates on SpatiaLite.

• The OpenLayers-based form widgets now use OpenLayers.js from
  https://cdnjs.cloudflare.com which is more suitable for production use
  than the the old http://openlayers.org source. They are also updated to
  use OpenLayers 3.

• PostGIS migrations can now change field dimensions.

• Added the ability to pass the size, shape, and offset parameter when
  creating :class:~django.contrib.gis.gdal.GDALRaster objects.

• Added SpatiaLite support for the
  :class:~django.contrib.gis.db.models.functions.IsValid function,
  :class:~django.contrib.gis.db.models.functions.MakeValid function, and
  :lookup:isvalid lookup.

• Added Oracle support for the
  :class:~django.contrib.gis.db.models.functions.AsGML function,
  :class:~django.contrib.gis.db.models.functions.BoundingCircle function,
  :class:~django.contrib.gis.db.models.functions.IsValid function, and
  :lookup:isvalid lookup.

:mod:django.contrib.postgres

• The new distinct argument for
  :class:~django.contrib.postgres.aggregates.StringAgg determines if
  concatenated values will be distinct.

• The new :class:~django.contrib.postgres.indexes.GinIndex and
  :class:~django.contrib.postgres.indexes.BrinIndex classes allow
  creating GIN and BRIN indexes in the database.

• :class:~django.contrib.postgres.fields.JSONField accepts a new encoder
  parameter to specify a custom class to encode data types not supported by the
  standard encoder.

• The new :class:~django.contrib.postgres.fields.CIText mixin and
  :class:~django.contrib.postgres.operations.CITextExtension migration
  operation allow using PostgreSQL's citext extension for case-insensitive
  lookups. Three fields are provided: :class:.CICharField,
  :class:.CIEmailField, and :class:.CITextField.

• The new :class:~django.contrib.postgres.aggregates.JSONBAgg allows
  aggregating values as a JSON array.

• The :class:~django.contrib.postgres.fields.HStoreField (model field) and
  :class:~django.contrib.postgres.forms.HStoreField (form field) allow
  storing null values.

Cache

• Memcached backends now pass the contents of :setting:OPTIONS <CACHES-OPTIONS>
  as keyword arguments to the client constructors, allowing for more advanced
  control of client behavior. See the :ref:cache arguments <cache_arguments>
  documentation for examples.

• Memcached backends now allow defining multiple servers as a comma-delimited
  string in :setting:LOCATION <CACHES-LOCATION>, for convenience with
  third-party services that use such strings in environment variables.

CSRF

• Added the :setting:CSRF_USE_SESSIONS setting to allow storing the CSRF
  token in the user's session rather than in a cookie.

Database backends

• Added the skip_locked argument to :meth:.QuerySet.select_for_update()
  on PostgreSQL 9.5+ and Oracle to execute queries with
  FOR UPDATE SKIP LOCKED.

• Added the :setting:TEST['TEMPLATE'] <TEST_TEMPLATE> setting to let
  PostgreSQL users specify a template for creating the test database.

• :meth:.QuerySet.iterator() now uses :ref:server-side cursors <psycopg2:server-side-cursors> on PostgreSQL. This feature transfers some of
  the worker memory load (used to hold query results) to the database and might
  increase database memory usage.

• Added MySQL support for the 'isolation_level' option in
  :setting:OPTIONS to allow specifying the :ref:transaction isolation level <mysql-isolation-level>. To avoid possible data loss, it's recommended to
  switch from MySQL's default level, repeatable read, to read committed.

• Added support for cx_Oracle 5.3.

Email

• Added the :setting:EMAIL_USE_LOCALTIME setting to allow sending SMTP date
  headers in the local time zone rather than in UTC.

• EmailMessage.attach() and attach_file() now fall back to MIME type
  application/octet-stream when binary content that can't be decoded as
  UTF-8 is specified for a text/* attachment.

File Storage

• To make it wrappable by :class:io.TextIOWrapper,
  :class:~django.core.files.File now has the readable(), writable(),
  and seekable() methods.

Forms

• The new :attr:CharField.empty_value <django.forms.CharField.empty_value>
  attribute allows specifying the Python value to use to represent "empty".

• The new :meth:Form.get_initial_for_field() <django.forms.Form.get_initial_for_field> method returns initial data for a
  form field.

Internationalization

• Number formatting and the :setting:NUMBER_GROUPING setting support
  non-uniform digit grouping.

Management Commands

• The new :option:loaddata --exclude option allows excluding models and apps
  while loading data from fixtures.

• The new :option:diffsettings --default option allows specifying a settings
  module other than Django's default settings to compare against.

• app_label\s arguments now limit the :option:showmigrations --plan
  output.

Migrations

• Added support for serialization of uuid.UUID objects.

Models

• Added support for callable values in the defaults argument of
  :meth:QuerySet.update_or_create() <django.db.models.query.QuerySet.update_or_create> and
  :meth:~django.db.models.query.QuerySet.get_or_create.

• :class:~django.db.models.ImageField now has a default
  :data:~django.core.validators.validate_image_file_extension validator.

• Added support for time truncation to
  :class:~django.db.models.functions.datetime.Trunc functions.

• Added the :class:~django.db.models.functions.datetime.ExtractWeek function
  to extract the week from :class:~django.db.models.DateField and
  :class:~django.db.models.DateTimeField and exposed it through the
  :lookup:week lookup.

• Added the :class:~django.db.models.functions.datetime.TruncTime function
  to truncate :class:~django.db.models.DateTimeField to its time component
  and exposed it through the :lookup:time lookup.

• Added support for expressions in :meth:.QuerySet.values and
  :meth:~.QuerySet.values_list.

• Added support for query expressions on lookups that take multiple arguments,
  such as range.

• You can now use the unique=True option with
  :class:~django.db.models.FileField.

• Added the nulls_first and nulls_last parameters to
  :class:Expression.asc() <django.db.models.Expression.asc> and
  :meth:~django.db.models.Expression.desc to control
  the ordering of null values.

• The new F expression bitleftshift() and bitrightshift() methods
  allow :ref:bitwise shift operations <using-f-expressions-in-filters>.

• Added :meth:.QuerySet.union, :meth:~.QuerySet.intersection, and
  :meth:~.QuerySet.difference.

Requests and Responses

• Added :meth:QueryDict.fromkeys() <django.http.QueryDict.fromkeys>.

• :class:~django.middleware.common.CommonMiddleware now sets the
  Content-Length response header for non-streaming responses.

• Added the :setting:SECURE_HSTS_PRELOAD setting to allow appending the
  preload directive to the Strict-Transport-Security header.

• :class:~django.middleware.http.ConditionalGetMiddleware now adds the
  ETag header to responses.

Serialization

• The new django.core.serializers.base.Serializer.stream_class attribute
  allows subclasses to customize the default stream.

• The encoder used by the :ref:JSON serializer <serialization-formats-json>
  can now be customized by passing a cls keyword argument to the
  serializers.serialize() function.

• :class:~django.core.serializers.json.DjangoJSONEncoder now serializes
  :class:~datetime.timedelta objects (used by
  :class:~django.db.models.DurationField).

Templates

• :meth:~django.utils.safestring.mark_safe can now be used as a decorator.

• The :class:~django.template.backends.jinja2.Jinja2 template backend now
  supports context processors by setting the 'context_processors' option in
  :setting:OPTIONS <TEMPLATES-OPTIONS>.

• The :ttag:regroup tag now returns namedtuple\s instead of dictionaries
  so you can unpack the group object directly in a loop, e.g.
  {% for grouper, list in regrouped %}.

• Added a :ttag:resetcycle template tag to allow resetting the sequence of
  the :ttag:cycle template tag.

• You can now specify specific directories for a particular
  :class:filesystem.Loader <django.template.loaders.filesystem.Loader>.

Tests

• Added :meth:.DiscoverRunner.get_test_runner_kwargs to allow customizing the
  keyword arguments passed to the test runner.

• Added the :option:test --debug-mode option to help troubleshoot test
  failures by setting the :setting:DEBUG setting to True.

• The new :func:django.test.utils.setup_databases (moved from
  django.test.runner) and :func:~django.test.utils.teardown_databases
  functions make it easier to build custom test runners.

• Added support for :meth:python:unittest.TestCase.subTest’s when using the
  :option:test --parallel option.

• DiscoverRunner now runs the system checks at the start of a test run.
  Override the :meth:.DiscoverRunner.run_checks method if you want to disable
  that.

Validators

• Added :class:~django.core.validators.FileExtensionValidator to validate
  file extensions and
  :data:~django.core.validators.validate_image_file_extension to validate
  image files.

.. _backwards-incompatible-1.11:

Backwards incompatible changes in 1.11

:mod:django.contrib.gis

• To simplify the codebase and because it's easier to install than when
  contrib.gis was first released, :ref:gdalbuild is now a required
  dependency for GeoDjango. In older versions, it's only required for SQLite.

• contrib.gis.maps is removed as it interfaces with a retired version of
  the Google Maps API and seems to be unmaintained. If you're using it, let us know <https://code.djangoproject.com/ticket/14284>_.

• The GEOSGeometry equality operator now also compares SRID.

• The OpenLayers-based form widgets now use OpenLayers 3, and the
  gis/openlayers.html and gis/openlayers-osm.html templates have been
  updated. Check your project if you subclass these widgets or extend the
  templates. Also, the new widgets work a bit differently than the old ones.
  Instead of using a toolbar in the widget, you click to draw, click and drag
  to move the map, and click and drag a point/vertex/corner to move it.

• Support for SpatiaLite < 4.0 is dropped.

• Support for GDAL 1.7 and 1.8 is dropped.

• The widgets in contrib.gis.forms.widgets and the admin's
  OpenLayersWidget use the :doc:form rendering API </ref/forms/renderers>
  rather than loader.render_to_string(). If you're using a custom widget
  template, you'll need to be sure your form renderer can locate it. For
  example, you could use the :class:~django.forms.renderers.TemplatesSetting
  renderer.

:mod:django.contrib.staticfiles

• collectstatic may now fail during post-processing when using a hashed
  static files storage if a reference loop exists (e.g. 'foo.css'
  references 'bar.css' which itself references 'foo.css') or if the
  chain of files referencing other files is too deep to resolve in several
  passes. In the latter case, increase the number of passes using
  :attr:.ManifestStaticFilesStorage.max_post_process_passes.

• When using ManifestStaticFilesStorage, static files not found in the
  manifest at runtime now raise a ValueError instead of returning an
  unchanged path. You can revert to the old behavior by setting
  :attr:.ManifestStaticFilesStorage.manifest_strict to False.

Database backend API

• The DatabaseOperations.time_trunc_sql() method is added to support
  TimeField truncation. It accepts a lookup_type and field_name
  arguments and returns the appropriate SQL to truncate the given time field
  field_name to a time object with only the given specificity. The
  lookup_type argument can be either 'hour', 'minute', or
  'second'.

• The DatabaseOperations.datetime_cast_time_sql() method is added to
  support the :lookup:time lookup. It accepts a field_name and tzname
  arguments and returns the SQL necessary to cast a datetime value to time value.

• To enable FOR UPDATE SKIP LOCKED support, set
  DatabaseFeatures.has_select_for_update_skip_locked = True.

• The new DatabaseFeatures.supports_index_column_ordering attribute
  specifies if a database allows defining ordering for columns in indexes. The
  default value is True and the DatabaseIntrospection.get_constraints()
  method should include an 'orders' key in each of the returned
  dictionaries with a list of 'ASC' and/or 'DESC' values corresponding
  to the the ordering of each column in the index.

• :djadmin:inspectdb no longer calls DatabaseIntrospection.get_indexes()
  which is deprecated. Custom database backends should ensure all types of
  indexes are returned by DatabaseIntrospection.get_constraints().

• Renamed the ignores_quoted_identifier_case feature to
  ignores_table_name_case to more accurately reflect how it is used.

• The name keyword argument is added to the
  DatabaseWrapper.create_cursor(self, name=None) method to allow usage of
  server-side cursors on backends that support it.

Dropped support for PostgreSQL 9.2 and PostGIS 2.0

Upstream support for PostgreSQL 9.2 ends in September 2017. As a consequence,
Django 1.11 sets PostgreSQL 9.3 as the minimum version it officially supports.

Support for PostGIS 2.0 is also removed as PostgreSQL 9.2 is the last version
to support it.

Also, the minimum supported version of psycopg2 is increased from 2.4.5 to
2.5.4.

LiveServerTestCase binds to port zero

Rather than taking a port range and iterating to find a free port,
LiveServerTestCase binds to port zero and relies on the operating system
to assign a free port. The DJANGO_LIVE_TEST_SERVER_ADDRESS environment
variable is no longer used, and as it's also no longer used, the
manage.py test --liveserver option is removed.

Protection against insecure redirects in :mod:django.contrib.auth and i18n views

LoginView, LogoutView (and the deprecated function-based equivalents),
and :func:~django.views.i18n.set_language protect users from being redirected
to non-HTTPS next URLs when the app is running over HTTPS.

QuerySet.get_or_create() and update_or_create() validate arguments

To prevent typos from passing silently,
:meth:~django.db.models.query.QuerySet.get_or_create and
:meth:~django.db.models.query.QuerySet.update_or_create check that their
arguments are model fields. This should be backwards-incompatible only in the
fact that it might expose a bug in your project.

pytz is a required dependency and support for settings.TIME_ZONE = None is removed

To simplify Django's timezone handling, pytz is now a required dependency.
It's automatically installed along with Django.

Support for settings.TIME_ZONE = None is removed as the behavior isn't
commonly used and is questionably useful. If you want to automatically detect
the timezone based on the system timezone, you can use tzlocal <https://pypi.python.org/pypi/tzlocal>_::

from tzlocal import get_localzone

TIME_ZONE = get_localzone().zone

This works similar to settings.TIME_ZONE = None except that it also sets
os.environ['TZ']. Let us know <https://groups.google.com/d/topic/django-developers/OAV3FChfuPM/discussion>__
if there's a use case where you find you can't adapt your code to set a
TIME_ZONE.

HTML changes in admin templates

<p class="help"> is replaced with a <div> tag to allow including lists
inside help text.

Read-only fields are wrapped in <div class="readonly">...</div> instead of
<p>...</p> to allow any kind of HTML as the field's content.

.. _template-widget-incompatibilities-1-11:

Changes due to the introduction of template-based widget rendering

Some undocumented classes in django.forms.widgets are removed:

• SubWidget
• RendererMixin, ChoiceFieldRenderer, RadioFieldRenderer,
  CheckboxFieldRenderer
• ChoiceInput, RadioChoiceInput, CheckboxChoiceInput

The Widget.format_output() method is removed. Use a custom widget template
instead.

Some widget values, such as <select> options, are now localized if
settings.USE_L10N=True. You could revert to the old behavior with custom
widget templates that uses the :ttag:localize template tag to turn off
localization.

django.template.backends.django.Template.render() prohibits non-dict context

For compatibility with multiple template engines,
django.template.backends.django.Template.render() (returned from high-level
template loader APIs such as loader.get_template()) must receive a
dictionary of context rather than Context or RequestContext. If you
were passing either of the two classes, pass a dictionary instead -- doing so
is backwards-compatible with older versions of Django.

Model state changes in migration operations

To improve the speed of applying migrations, rendering of related models is
delayed until an operation that needs them (e.g. RunPython). If you have a
custom operation that works with model classes or model instances from the
from_state argument in database_forwards() or database_backwards(),
you must render model states using the clear_delayed_apps_cache() method as
described in :ref:writing your own migration operation <writing-your-own-migration-operation>.

Miscellaneous

• If no items in the feed have a pubdate or updateddate attribute,
  :meth:SyndicationFeed.latest_post_date() <django.utils.feedgenerator.SyndicationFeed.latest_post_date> now returns
  the current UTC date/time, instead of a datetime without any timezone
  information.

• CSRF failures are logged to the django.security.csrf logger instead of
  django.request.

• :setting:ALLOWED_HOSTS validation is no longer disabled when running tests.
  If your application includes tests with custom host names, you must include
  those host names in :setting:ALLOWED_HOSTS. See
  :ref:topics-testing-advanced-multiple-hosts.

• Using a foreign key's id (e.g. 'field_id') in ModelAdmin.list_display
  displays the related object's ID. Remove the _id suffix if you want the
  old behavior of the string representation of the object.

• In model forms, :class:~django.db.models.CharField with null=True now
  saves NULL for blank values instead of empty strings.

• On Oracle, :meth:Model.validate_unique() <django.db.models.Model.validate_unique> no longer checks empty strings for
  uniqueness as the database interprets the value as NULL.

• If you subclass :class:.AbstractUser and override clean(), be sure it
  calls super(). :meth:.BaseUserManager.normalize_email is called in a
  new :meth:.AbstractUser.clean method so that normalization is applied in
  cases like model form validation.

• EmailField and URLField no longer accept the strip keyword
  argument. Remove it because it doesn't have an effect in older versions of
  Django as these fields always strip whitespace.

• The checked and selected attribute rendered by form widgets now uses
  HTML5 boolean syntax rather than XHTML's checked='checked' and
  selected='selected'.

• :meth:RelatedManager.add() <django.db.models.fields.related.RelatedManager.add>,
  :meth:~django.db.models.fields.related.RelatedManager.remove,
  :meth:~django.db.models.fields.related.RelatedManager.clear, and
  :meth:~django.db.models.fields.related.RelatedManager.set now
  clear the prefetch_related() cache.

• To prevent possible loss of saved settings,
  :func:~django.test.utils.setup_test_environment now raises an exception if
  called a second time before calling
  :func:~django.test.utils.teardown_test_environment.

• The undocumented DateTimeAwareJSONEncoder alias for
  :class:~django.core.serializers.json.DjangoJSONEncoder (renamed in Django
  1.0) is removed.

• The :class:cached template loader <django.template.loaders.cached.Loader>
  is now enabled if :setting:DEBUG is False and
  :setting:OPTIONS['loaders'] <TEMPLATES-OPTIONS> isn't specified. This could
  be backwards-incompatible if you have some :ref:template tags that aren't thread safe <template_tag_thread_safety>.

• The prompt for stale content type deletion no longer occurs after running the
  migrate command. Use the new :djadmin:remove_stale_contenttypes command
  instead.

• The admin's widget for IntegerField uses type="number" rather than
  type="text".

• Conditional HTTP headers are now parsed and compared according to the
  :rfc:7232 Conditional Requests specification rather than the older
  :rfc:2616.

• :func:~django.utils.cache.patch_response_headers no longer adds a
  Last-Modified header. According to the :rfc:7234section-4.2.2, this
  header is useless alongside other caching headers that provide an explicit
  expiration time, e.g. Expires or Cache-Control.
  :class:~django.middleware.cache.UpdateCacheMiddleware and
  :func:~django.utils.cache.add_never_cache_headers call
  patch_response_headers() and therefore are also affected by this change.

• In the admin templates, <p class="help"> is replaced with a <div> tag
  to allow including lists inside help text.

• :class:~django.middleware.http.ConditionalGetMiddleware no longer sets the
  Date header as Web servers set that header. It also no longer sets the
  Content-Length header as this is now done by
  :class:~django.middleware.common.CommonMiddleware.

• :meth:~django.apps.AppConfig.get_model and
  :meth:~django.apps.AppConfig.get_models now raise
  :exc:~django.core.exceptions.AppRegistryNotReady if they're called before
  models of all applications have been loaded. Previously they only required
  the target application's models to be loaded and thus could return models
  without all their relations set up. If you need the old behavior of
  get_model(), set the require_ready argument to False.

• The unused BaseCommand.can_import_settings attribute is removed.

• The undocumented django.utils.functional.lazy_property is removed.

• For consistency with non-multipart requests, MultiPartParser.parse() now
  leaves request.POST immutable. If you're modifying that QueryDict,
  you must now first copy it, e.g. request.POST.copy().

• Support for cx_Oracle < 5.2 is removed.

• Support for IPython < 1.0 is removed from the shell command.

.. _deprecated-features-1.11:

Features deprecated in 1.11

models.permalink() decorator

Use :func:django.urls.reverse instead. For example::

from django.db import models

class MyModel(models.Model):
...

   models.permalink
   def url(self):
       return ('guitarist_detail', [self.slug])

becomes::

from django.db import models
from django.urls import reverse

class MyModel(models.Model):
...

   def url(self):
       return reverse('guitarist_detail', args=[self.slug])

Miscellaneous

• contrib.auth’s login() and logout() function-based views are
  deprecated in favor of new class-based views
  :class:~django.contrib.auth.views.LoginView and
  :class:~django.contrib.auth.views.LogoutView.

• The unused extra_context parameter of
  contrib.auth.views.logout_then_login() is deprecated.

• contrib.auth’s password_change(), password_change_done(),
  password_reset(), password_reset_done(), password_reset_confirm(),
  and password_reset_complete() function-based views are deprecated in favor
  of new class-based views
  :class:~django.contrib.auth.views.PasswordChangeView,
  :class:~django.contrib.auth.views.PasswordChangeDoneView,
  :class:~django.contrib.auth.views.PasswordResetView,
  :class:~django.contrib.auth.views.PasswordResetDoneView,
  :class:~django.contrib.auth.views.PasswordResetConfirmView, and
  :class:~django.contrib.auth.views.PasswordResetCompleteView.

• django.test.runner.setup_databases() is moved to
  :func:django.test.utils.setup_databases. The old location is deprecated.

• django.utils.translation.string_concat() is deprecated in
  favor of :func:django.utils.text.format_lazy. string_concat(*strings)
  can be replaced by format_lazy('{}' * len(strings), *strings).

• For the PyLibMCCache cache backend, passing pylibmc behavior settings
  as top-level attributes of OPTIONS is deprecated. Set them under a
  behaviors key within OPTIONS instead.

• The host parameter of django.utils.http.is_safe_url() is deprecated
  in favor of the new allowed_hosts parameter.

• Silencing exceptions raised while rendering the
  :ttag:{% include %} <include> template tag is deprecated as the behavior is
  often more confusing than helpful. In Django 2.1, the exception will be
  raised.

• DatabaseIntrospection.get_indexes() is deprecated in favor of
  DatabaseIntrospection.get_constraints().

• :func:~django.contrib.auth.authenticate now passes a request argument
  to the authenticate() method of authentication backends. Support for
  methods that don't accept request as the first positional argument will
  be removed in Django 2.1.

• The USE_ETAGS setting is deprecated in favor of
  :class:~django.middleware.http.ConditionalGetMiddleware which now adds the
  ETag header to responses regardless of the setting. CommonMiddleware
  and django.utils.cache.patch_response_headers() will no longer set ETags
  when the deprecation ends.

• Model._meta.has_auto_field is deprecated in favor of checking if
  Model._meta.auto_field is not None.

• Using regular expression groups with iLmsu in url() is deprecated.
  The only group that's useful is (?i) for case-insensitive URLs, however,
  case-insensitive URLs aren't a good practice because they create multiple
  entries for search engines, for example. An alternative solution could be to
  create a :data:~django.conf.urls.handler404 that looks for uppercase
  characters in the URL and redirects to a lowercase equivalent.

• The renderer argument is added to the :meth:Widget.render() <django.forms.Widget.render> method. Methods that don't accept that argument
  will work through a deprecation period.

===========================

1.10.7

===========================

April 4, 2017

Django 1.10.7 fixes two security issues and a bug in 1.10.6.

CVE-2017-7233: Open redirect and possible XSS attack via user-supplied numeric redirect URLs

Django relies on user input in some cases (e.g.
:func:django.contrib.auth.views.login and :doc:i18n </topics/i18n/index>)
to redirect the user to an "on success" URL. The security check for these
redirects (namely django.utils.http.is_safe_url()) considered some numeric
URLs (e.g. http:999999999) "safe" when they shouldn't be.

Also, if a developer relies on is_safe_url() to provide safe redirect
targets and puts such a URL into a link, they could suffer from an XSS attack.

CVE-2017-7234: Open redirect vulnerability in django.views.static.serve()

A maliciously crafted URL to a Django site using the
:func:~django.views.static.serve view could redirect to any other domain. The
view no longer does any redirects as they don't provide any known, useful
functionality.

Note, however, that this view has always carried a warning that it is not
hardened for production use and should be used only as a development aid.

Bugfixes

• Made admin's RelatedFieldWidgetWrapper use the wrapped widget's
  value_omitted_from_data() method (:ticket:27905).

• Fixed model form default fallback for SelectMultiple
  (:ticket:27993).

===========================

1.10.6

===========================

March 1, 2017

Django 1.10.6 fixes several bugs in 1.10.5.

Bugfixes

• Fixed ClearableFileInput’s "Clear" checkbox on model form fields where
  the model field has a default (:ticket:27805).

• Fixed RequestDataTooBig and TooManyFieldsSent exceptions crashing
  rather than generating a bad request response (:ticket:27820).

• Fixed a crash on Oracle and PostgreSQL when subtracting DurationField
  or IntegerField from DateField (:ticket:27828).

• Fixed query expression date subtraction accuracy on PostgreSQL for
  differences larger than a month (:ticket:27856).

• Fixed a GDALException raised by GDALClose on GDAL ≥ 2.0
  (:ticket:27479).

===========================

1.10.5

===========================

January 4, 2017

Django 1.10.5 fixes several bugs in 1.10.4.

Bugfixes

• Fixed a crash in the debug view if request.user can't be retrieved, such
  as if the database is unavailable (:ticket:27567).

• Fixed occasional missing plural forms in JavaScriptCatalog
  (:ticket:27418).

• Fixed a regression in the timesince and timeuntil filters that caused
  incorrect results for dates in a leap year (:ticket:27637).

• Fixed a regression where collectstatic overwrote newer files in remote
  storages (:ticket:27658).

===========================

1.10.4

===========================

December 1, 2016

Django 1.10.4 fixes several bugs in 1.10.3.

Bugfixes

• Quoted the Oracle test user's password in queries to fix the "ORA-00922:
  missing or invalid option" error when the password starts with a number or
  special character (:ticket:27420).

• Fixed incorrect app_label / model_name arguments for
  allow_migrate() in makemigrations migration consistency checks
  (:ticket:27461).

• Made Model.delete(keep_parents=True) preserve parent reverse
  relationships in multi-table inheritance (:ticket:27407).

• Fixed a QuerySet.update() crash on SQLite when updating a
  DateTimeField with an F() expression and a timedelta
  (:ticket:27544).

• Prevented LocaleMiddleware from redirecting on URLs that should return
  404 when using prefix_default_language=False (:ticket:27402).

• Prevented an unnecessary index from being created on an InnoDB ForeignKey
  when the field was added after the model was created (:ticket:27558).

===========================

1.10.3

===========================

November 1, 2016

Django 1.10.3 fixes two security issues and several bugs in 1.10.2.

User with hardcoded password created when running tests on Oracle

When running tests with an Oracle database, Django creates a temporary database
user. In older versions, if a password isn't manually specified in the database
settings TEST dictionary, a hardcoded password is used. This could allow
an attacker with network access to the database server to connect.

This user is usually dropped after the test suite completes, but not when using
the manage.py test --keepdb option or if the user has an active session
(such as an attacker's connection).

A randomly generated password is now used for each test run.

DNS rebinding vulnerability when DEBUG=True

Older versions of Django don't validate the Host header against
settings.ALLOWED_HOSTS when settings.DEBUG=True. This makes them
vulnerable to a DNS rebinding attack <http://benmmurphy.github.io/blog/2016/07/11/rails-webconsole-dns-rebinding/>_.

While Django doesn't ship a module that allows remote code execution, this is
at least a cross-site scripting vector, which could be quite serious if
developers load a copy of the production database in development or connect to
some production services for which there's no development instance, for
example. If a project uses a package like the django-debug-toolbar, then
the attacker could execute arbitrary SQL, which could be especially bad if the
developers connect to the database with a superuser account.

settings.ALLOWED_HOSTS is now validated regardless of DEBUG. For
convenience, if ALLOWED_HOSTS is empty and DEBUG=True, the following
variations of localhost are allowed ['localhost', '127.0.0.1', '::1']. If
your local settings file has your production ALLOWED_HOSTS value, you must
now omit it to get those fallback values.

Bugfixes

• Allowed User.is_authenticated and User.is_anonymous properties to be
  tested for set membership (:ticket:27309).

• Fixed a performance regression when running migrate in projects
  with RenameModel operations (:ticket:27279).

• Added model_name to the allow_migrate() calls in makemigrations
  (:ticket:27200).

• Made the JavaScriptCatalog view respect the packages argument;
  previously it was ignored (:ticket:27374).

• Fixed QuerySet.bulk_create() on PostgreSQL when the number of objects is
  a multiple plus one of batch_size (:ticket:27385).

• Prevented i18n_patterns() from using too much of the URL as the language
  to fix a use case for prefix_default_language=False (:ticket:27063).

• Replaced a possibly incorrect redirect from SessionMiddleware when a
  session is destroyed in a concurrent request with a SuspiciousOperation
  to indicate that the request can't be completed (:ticket:27363).

===========================

1.10.2

===========================

October 1, 2016

Django 1.10.2 fixes several bugs in 1.10.1.

Bugfixes

• Fixed a crash in MySQL database validation where SELECT sql_mode
  doesn't return a result (:ticket:27180).

• Allowed combining contrib.postgres.search.SearchQuery with more than one
  & or | operators (:ticket:27143).

• Disabled system check for URL patterns beginning with a '/' when
  APPEND_SLASH=False (:ticket:27238).

• Fixed model form default fallback for CheckboxSelectMultiple,
  MultiWidget, FileInput, SplitDateTimeWidget, SelectDateWidget,
  and SplitArrayWidget (:ticket:27186). Custom widgets affected by this
  issue should implement :meth:~django.forms.Widget.value_omitted_from_data.

• Fixed a crash in runserver logging during a "Broken pipe" error
  (:ticket:27271).

• Fixed a regression where unchanged localized date/time fields were listed as
  changed in the admin's model history messages (:ticket:27302).

===========================

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[codecov-io]

Codecov Report

Merging #239 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #239   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines          64     64           
=====================================
  Hits           64     64

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