[1.9.x] Fixed #26092 -- Fixed QuerySet.order_by() regression with an M2M through model.

Backport of ee596888e1149864e7828f5cf63c0eda395744c3 from master

2 files changed, 15 insertions, 0 deletions

diff --git a/tests/m2m_through/models.py b/tests/m2m_through/models.py
index c25303f6f5..dab3be5164 100644
--- a/tests/m2m_through/models.py
+++ b/tests/m2m_through/models.py
@@ -65,6 +65,7 @@ class CustomMembership(models.Model):
 
     class Meta:
         db_table = "test_table"
+        ordering = ["date_joined"]
 
 
 class TestNoDefaultsOrNulls(models.Model):
diff --git a/tests/m2m_through/tests.py b/tests/m2m_through/tests.py
index 0d6609a6cd..5f5d78ea28 100644
--- a/tests/m2m_through/tests.py
+++ b/tests/m2m_through/tests.py
@@ -197,6 +197,20 @@ class M2mThroughTests(TestCase):
             attrgetter("name")
         )
 
+    def test_order_by_relational_field_through_model(self):
+        CustomMembership.objects.create(person=self.jim, group=self.rock)
+        CustomMembership.objects.create(person=self.bob, group=self.rock)
+        CustomMembership.objects.create(person=self.jane, group=self.roll)
+        CustomMembership.objects.create(person=self.jim, group=self.roll)
+        self.assertQuerysetEqual(
+            self.rock.custom_members.order_by('custom_person_related_name'),
+            [self.jim, self.bob], lambda x: x
+        )
+        self.assertQuerysetEqual(
+            self.roll.custom_members.order_by('custom_person_related_name'),
+            [self.jane, self.jim], lambda x: x
+        )
+
     def test_query_first_model_by_intermediate_model_attribute(self):
         Membership.objects.create(
             person=self.jane, group=self.roll,