Fixed #10733 -- select_related().only() failure

The bug was reported pre 1.1, and somewhere along the way it has been
fixed. So, this is tests only addition.

tests/select_related_regress/models.py

@@ -108,3 +108,21 @@ class Hen(Fowl):
 
 class Chick(Fowl):
     mother = models.ForeignKey(Hen)
+
+class Base(models.Model):
+    name = models.CharField(max_length=10)
+    lots_of_text = models.TextField()
+
+    class Meta:
+        abstract = True
+
+class A(Base):
+    a_field = models.CharField(max_length=10)
+
+class B(Base):
+    b_field = models.CharField(max_length=10)
+
+class C(Base):
+    c_a = models.ForeignKey(A)
+    c_b = models.ForeignKey(B)
+    is_published = models.BooleanField()

tests/select_related_regress/tests.py

@@ -5,7 +5,7 @@ from django.utils import six
 
 from .models import (Building, Child, Device, Port, Item, Country, Connection,
     ClientStatus, State, Client, SpecialClient, TUser, Person, Student,
-    Organizer, Class, Enrollment, Hen, Chick)
+    Organizer, Class, Enrollment, Hen, Chick, Base, A, B, C)
 
 
 class SelectRelatedRegressTests(TestCase):
@@ -173,3 +173,19 @@ class SelectRelatedRegressTests(TestCase):
 
         self.assertEqual(Chick.objects.all()[0].mother.name, 'Hen')
         self.assertEqual(Chick.objects.select_related()[0].mother.name, 'Hen')
+
+    def test_ticket_10733(self):
+        a = A.objects.create(name='a', lots_of_text='lots_of_text_a', a_field='a_field')
+        b = B.objects.create(name='b', lots_of_text='lots_of_text_b', b_field='b_field')
+        c = C.objects.create(name='c', lots_of_text='lots_of_text_c', is_published=True,
+                             c_a=a, c_b=b)
+        results = C.objects.all().only('name', 'lots_of_text', 'c_a', 'c_b', 'c_b__lots_of_text',
+                                       'c_a__name', 'c_b__name').select_related()
+        self.assertQuerysetEqual(results, [c], lambda x: x)
+        with self.assertNumQueries(0):
+            qs_c = results[0]
+            self.assertEqual(qs_c.name, 'c')
+            self.assertEqual(qs_c.lots_of_text, 'lots_of_text_c')
+            self.assertEqual(qs_c.c_b.lots_of_text, 'lots_of_text_b')
+            self.assertEqual(qs_c.c_a.name, 'a')
+            self.assertEqual(qs_c.c_b.name, 'b')