Fixed #23055 -- Made generic admin filter obey ModelAdmin queryset.

Thanks to Trac user synasius and to Ola Sitarska for helping in
identifying the issue and helping with the test case.

django/contrib/admin/filters.py

@@ -364,7 +364,12 @@ class AllValuesFieldListFilter(FieldListFilter):
         self.lookup_val_isnull = request.GET.get(self.lookup_kwarg_isnull,
                                                  None)
         parent_model, reverse_path = reverse_field_path(model, field_path)
-        queryset = parent_model._default_manager.all()
+        # Obey parent ModelAdmin queryset when deciding which options to show
+        if model == parent_model:
+            queryset = model_admin.get_queryset(request)
+        else:
+            queryset = parent_model._default_manager.all()
+
         # optional feature: limit choices base on existing relationships
         # queryset = queryset.complex_filter(
         #    {'%s__isnull' % reverse_path: False})

tests/admin_filters/tests.py

@@ -134,6 +134,18 @@ class BookAdminWithUnderscoreLookupAndTuple(BookAdmin):
     list_filter = ('year', ('author__email', AllValuesFieldListFilter), 'contributors', 'is_best_seller', 'date_registered', 'no')
 
 
+class BookAdminWithCustomQueryset(ModelAdmin):
+
+    def __init__(self, user, *args, **kwargs):
+        self.user = user
+        super(BookAdminWithCustomQueryset, self).__init__(*args, **kwargs)
+
+    list_filter = ('year',)
+
+    def get_queryset(self, request):
+        return super(BookAdminWithCustomQueryset, self).get_queryset(request).filter(author=self.user)
+
+
 class BookAdminRelatedOnlyFilter(ModelAdmin):
     list_filter = (
         'year', 'is_best_seller', 'date_registered', 'no',
@@ -365,6 +377,22 @@ class ListFiltersTests(TestCase):
         self.assertEqual(choices[2]['selected'], True)
         self.assertEqual(choices[2]['query_string'], '?year=2002')
 
+    def test_allvaluesfieldlistfilter_custom_qs(self):
+        # Make sure that correct filters are returned with custom querysets
+        modeladmin = BookAdminWithCustomQueryset(self.alfred, Book, site)
+        request = self.request_factory.get('/')
+        changelist = self.get_changelist(request, Book, modeladmin)
+
+        filterspec = changelist.get_filters(request)[0][0]
+        choices = list(filterspec.choices(changelist))
+        # Should have 'All', 1999 and 2009 options i.e. the subset of years of
+        # books written by alfred (which is the filtering criteria set by
+        # BookAdminWithCustomQueryset.get_queryset())
+        self.assertEqual(3, len(choices))
+        self.assertEqual(choices[0]['query_string'], '?')
+        self.assertEqual(choices[1]['query_string'], '?year=1999')
+        self.assertEqual(choices[2]['query_string'], '?year=2009')
+
     def test_relatedfieldlistfilter_foreignkey(self):
         modeladmin = BookAdmin(Book, site)