Fixed a crash in MySQL connections where SELECT @@SQL_AUTO_IS_NULL doesn’t return a result (#26991).
Allowed User.is_authenticated and User.is_anonymous properties to be compared using ==, !=, and | (#26988, #27154).
Removed the broken BaseCommand.usage() method which was for optparse support (#27000).
Fixed a checks framework crash with an empty Meta.default_permissions (#26997).
Fixed a regression in the number of queries when using RadioSelect with a ModelChoiceField form field (#27001).
Fixed a crash if request.META['CONTENT_LENGTH'] is an empty string (#27005).
Fixed
the isnull lookup on a ForeignKey with its to_field pointing to a
CharField or pointing to a CharField defined with primary_key=True
(#26983).
Prevented the migrate command from raising
InconsistentMigrationHistory in the presence of unapplied squashed
migrations (#27004).
Fixed a regression in
Client.force_login() which required specifying a backend rather than
automatically using the first one if multiple backends are configured
(#27027).
Made QuerySet.bulk_create() properly initialize
model instances on backends, such as PostgreSQL, that support returning
the IDs of the created records so that many-to-many relationships can
be used on the new objects (#27026).
Fixed crash of django.views.static.serve() with show_indexes enabled (#26973).
Fixed ClearableFileInput to avoid the required HTML attribute when initial data exists (#27037).
Fixed annotations with database functions when combined with lookups on PostGIS (#27014).
Reallowed the {% for %} tag to unpack any iterable (#27058).
Made
makemigrations skip inconsistent history checks on non-default
databases if database routers aren’t in use or if no apps can be
migrated to the database (#27054, #27110, #27142).
Removed duplicated managers in Model._meta.managers (#27073).
Fixed contrib.admindocs crash when a view is in a class, such as some of the admin views (#27018).
Reverted
a few admin checks that checked field.many_to_many back to
isinstance(field, models.ManyToManyField) since it turned out the checks
weren’t suitable to be generalized like that (#26998).
Added the database alias to the InconsistentMigrationHistory message raised by makemigrations and migrate (#27089).
Fixed
the creation of ContentType and Permission objects for models of
applications without migrations when calling the migrate command with no
migrations to apply (#27044).
Included the already
applied migration state changes in the Apps instance provided to the
pre_migrate signal receivers to allow ContentType renaming to be
performed on model rename (#27100).
Reallowed subclassing UserCreationForm without USERNAME_FIELD in Meta.fields (#27111).
Fixed
a regression in model forms where model fields with a default that
didn’t appear in POST data no longer used the default (#27039).
