Fixed #14423 -- corrected incorrect SQL being generated when a nullable, inherited field was used in an exclude. Thanks to PhiR_42 for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14600 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/model_inheritance_regress/tests.py

@@ -3,12 +3,16 @@ Regression tests for Model inheritance behaviour.
 """
 
 import datetime
+from operator import attrgetter
+
 from django.test import TestCase
-from regressiontests.model_inheritance_regress.models import (
-    Place, Restaurant, ItalianRestaurant, ParkingLot, ParkingLot2,
-    ParkingLot3, Supplier, Wholesaler, Child, SelfRefChild, ArticleWithAuthor,
-    M2MChild, QualityControl, DerivedM, Person, BirthdayParty, BachelorParty,
-    MessyBachelorParty, InternalCertificationAudit)
+
+from models import (Place, Restaurant, ItalianRestaurant, ParkingLot,
+    ParkingLot2, ParkingLot3, Supplier, Wholesaler, Child, SelfRefParent,
+    SelfRefChild, ArticleWithAuthor, M2MChild, QualityControl, DerivedM,
+    Person, BirthdayParty, BachelorParty, MessyBachelorParty,
+    InternalCertificationAudit)
+
 
 class ModelInheritanceTest(TestCase):
     def test_model_inheritance(self):
@@ -355,7 +359,10 @@ class ModelInheritanceTest(TestCase):
         self.assertEqual(parties, [bachelor, messy_parent])
 
     def test_11369(self):
-        """verbose_name_plural correctly inherited from ABC if inheritance chain includes an abstract model."""
+        """
+        verbose_name_plural correctly inherited from ABC if inheritance chain
+        includes an abstract model.
+        """
         # Regression test for #11369: verbose_name_plural should be inherited
         # from an ABC even when there are one or more intermediate
         # abstract models in the inheritance chain, for consistency with
@@ -364,3 +371,18 @@ class ModelInheritanceTest(TestCase):
                 InternalCertificationAudit._meta.verbose_name_plural,
                 u'Audits'
         )
+
+    def test_inherited_nullable_exclude(self):
+        obj = SelfRefChild.objects.create(child_data=37, parent_data=42)
+        self.assertQuerysetEqual(
+            SelfRefParent.objects.exclude(self_data=72), [
+                obj.pk
+            ],
+            attrgetter("pk")
+        )
+        self.assertQuerysetEqual(
+            SelfRefChild.objects.exclude(self_data=72), [
+                obj.pk
+            ],
+            attrgetter("pk")
+        )