Ticket #19870: select_related_regress.patch

tests/regressiontests/select_related_regress/models.py

@@ -94 +94 @@
 
     def __str__(self):
         return self.name
+
+# Models for testing bug #19870.
+@python_2_unicode_compatible
+class Fowl(models.Model):
+    name = models.CharField(max_length=10)
+
+    def __str__(self):
+        return self.name
+
+class Hen(Fowl):
+    pass
+
+class Chick(Fowl):
+    mother = models.ForeignKey(Hen)

tests/regressiontests/select_related_regress/tests.py

@@ -5 +5 @@
 
 from .models import (Building, Child, Device, Port, Item, Country, Connection,
     ClientStatus, State, Client, SpecialClient, TUser, Person, Student,
-    Organizer, Class, Enrollment)
+    Organizer, Class, Enrollment, Hen, Chick)
 
 
 class SelectRelatedRegressTests(TestCase):
@@ -162 +162 @@
             # The select_related join was promoted as there is already an
             # existing join.
             self.assertTrue('LEFT OUTER' in str(qs.query))
+
+    def test_regression_19870(self):
+        """
+        Regression for #19870
+
+        """
+        hen = Hen.objects.create(name='Hen')
+        chick = Chick.objects.create(name='Chick', mother=hen)
+
+        self.assertEqual(Chick.objects.all()[0].mother.name, 'Hen')
+        self.assertEqual(Chick.objects.select_related()[0].mother.name, 'Hen')