Fixed #29835 -- Made RelatedFieldListFilter respect ModelAdmin.ordering.

django/contrib/admin/filters.py

@@ -194,7 +194,11 @@ def expected_parameters(self):
         return [self.lookup_kwarg, self.lookup_kwarg_isnull]
 
     def field_choices(self, field, request, model_admin):
-        return field.get_choices(include_blank=False)
+        ordering = ()
+        related_admin = model_admin.admin_site._registry.get(field.remote_field.model)
+        if related_admin is not None:
+            ordering = related_admin.get_ordering(request)
+        return field.get_choices(include_blank=False, ordering=ordering)
 
     def choices(self, changelist):
         yield {

django/db/models/fields/__init__.py

@@ -807,7 +807,7 @@ def _get_default(self):
             return return_None
         return str  # return empty string
 
-    def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH, limit_choices_to=None):
+    def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH, limit_choices_to=None, ordering=()):
         """
         Return choices with a default blank choices included, for use
         as <select> choices for this field.
@@ -828,7 +828,7 @@ def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH, limit_
         )
         return (blank_choice if include_blank else []) + [
             (choice_func(x), str(x))
-            for x in rel_model._default_manager.complex_filter(limit_choices_to)
+            for x in rel_model._default_manager.complex_filter(limit_choices_to).order_by(*ordering)
         ]
 
     def value_to_string(self, obj):

django/db/models/fields/reverse_related.py

@@ -114,7 +114,7 @@ def __repr__(self):
             self.related_model._meta.model_name,
         )
 
-    def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH):
+    def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH, ordering=()):
         """
         Return choices with a default blank choices included, for use
         as <select> choices for this field.
@@ -123,7 +123,7 @@ def get_choices(self, include_blank=True, blank_choice=BLANK_CHOICE_DASH):
         initially for utilization by RelatedFieldListFilter.
         """
         return (blank_choice if include_blank else []) + [
-            (x.pk, str(x)) for x in self.related_model._default_manager.all()
+            (x.pk, str(x)) for x in self.related_model._default_manager.order_by(*ordering)
         ]
 
     def is_hidden(self):

tests/admin_filters/tests.py

@@ -548,6 +548,43 @@ def test_relatedfieldlistfilter_foreignkey(self):
         self.assertIs(choice['selected'], True)
         self.assertEqual(choice['query_string'], '?author__id__exact=%d' % self.alfred.pk)
 
+    def test_relatedfieldlistfilter_foreignkey_ordering(self):
+        """RelatedFieldListFilter ordering respects ModelAdmin.ordering."""
+        class EmployeeAdminWithOrdering(ModelAdmin):
+            ordering = ('name',)
+
+        class BookAdmin(ModelAdmin):
+            list_filter = ('employee',)
+
+        site.register(Employee, EmployeeAdminWithOrdering)
+        self.addCleanup(lambda: site.unregister(Employee))
+        modeladmin = BookAdmin(Book, site)
+
+        request = self.request_factory.get('/')
+        request.user = self.alfred
+        changelist = modeladmin.get_changelist_instance(request)
+        filterspec = changelist.get_filters(request)[0][0]
+        expected = [(self.jack.pk, 'Jack Red'), (self.john.pk, 'John Blue')]
+        self.assertEqual(filterspec.lookup_choices, expected)
+
+    def test_relatedfieldlistfilter_foreignkey_ordering_reverse(self):
+        class EmployeeAdminWithOrdering(ModelAdmin):
+            ordering = ('-name',)
+
+        class BookAdmin(ModelAdmin):
+            list_filter = ('employee',)
+
+        site.register(Employee, EmployeeAdminWithOrdering)
+        self.addCleanup(lambda: site.unregister(Employee))
+        modeladmin = BookAdmin(Book, site)
+
+        request = self.request_factory.get('/')
+        request.user = self.alfred
+        changelist = modeladmin.get_changelist_instance(request)
+        filterspec = changelist.get_filters(request)[0][0]
+        expected = [(self.john.pk, 'John Blue'), (self.jack.pk, 'Jack Red')]
+        self.assertEqual(filterspec.lookup_choices, expected)
+
     def test_relatedfieldlistfilter_manytomany(self):
         modeladmin = BookAdmin(Book, site)
 

tests/model_fields/tests.py

@@ -6,7 +6,7 @@
 from django.utils.functional import lazy
 
 from .models import (
-    Foo, RenamedField, VerboseNameField, Whiz, WhizIter, WhizIterEmpty,
+    Bar, Foo, RenamedField, VerboseNameField, Whiz, WhizIter, WhizIterEmpty,
 )
 
 
@@ -157,3 +157,37 @@ def test_lazy_strings_not_evaluated(self):
         lazy_func = lazy(lambda x: 0 / 0, int)  # raises ZeroDivisionError if evaluated.
         f = models.CharField(choices=[(lazy_func('group'), (('a', 'A'), ('b', 'B')))])
         self.assertEqual(f.get_choices(include_blank=True)[0], ('', '---------'))
+
+
+class GetChoicesOrderingTests(TestCase):
+
+    @classmethod
+    def setUpTestData(cls):
+        cls.foo1 = Foo.objects.create(a='a', d='12.34')
+        cls.foo2 = Foo.objects.create(a='b', d='12.34')
+        cls.bar1 = Bar.objects.create(a=cls.foo1, b='a')
+        cls.bar2 = Bar.objects.create(a=cls.foo2, b='a')
+        cls.field = Bar._meta.get_field('a')
+
+    def assertChoicesEqual(self, choices, objs):
+        self.assertEqual(choices, [(obj.pk, str(obj)) for obj in objs])
+
+    def test_get_choices(self):
+        self.assertChoicesEqual(
+            self.field.get_choices(include_blank=False, ordering=('a',)),
+            [self.foo1, self.foo2]
+        )
+        self.assertChoicesEqual(
+            self.field.get_choices(include_blank=False, ordering=('-a',)),
+            [self.foo2, self.foo1]
+        )
+
+    def test_get_choices_reverse_related_field(self):
+        self.assertChoicesEqual(
+            self.field.remote_field.get_choices(include_blank=False, ordering=('a',)),
+            [self.bar1, self.bar2]
+        )
+        self.assertChoicesEqual(
+            self.field.remote_field.get_choices(include_blank=False, ordering=('-a',)),
+            [self.bar2, self.bar1]
+        )