Ticket #7778: tests_queries.diff

tests/regressiontests/queries/models.py

@@ -189 +189 @@
 class Related(models.Model):
     custom = models.ForeignKey(CustomPk)
 
+# An inter-related setup with a model subclass that has a nullable
+# path to another model, and a return path from that model.
 
+class Celebrity(models.Model):
+    name = models.CharField("Name", max_length=20)
+    greatest_fan = models.ForeignKey("Fan", null=True, unique=True)
+
+class TvChef(Celebrity):
+    pass
+    
+class Fan(models.Model):
+    fan_of = models.ForeignKey(Celebrity)
+
+
 __test__ = {'API_TESTS':"""
 >>> t1 = Tag.objects.create(name='t1')
 >>> t2 = Tag.objects.create(name='t2', parent=t1)
@@ -830 +843 @@
 ...     obj.save()
 ...     if i > 10: break
 
+Bug #7778 - Model subclasses cannot be deleted if a nullable foreign key relates 
+to a model that relates back.
+
+>>> tvc = TvChef.objects.create(name="Huey")
+>>> f1 = Fan.objects.create(fan_of=tvc)
+>>> f2 = Fan.objects.create(fan_of=tvc)
+>>> tvc.delete()
 """}