Fixed #11319 - Added lookup support for ForeignKey.to_field. Also reverted no-longer-needed model formsets workaround for lack of such support from r10756. Thanks Russell and Alex for review.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15303 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/delete_regress/tests.py

@@ -5,7 +5,7 @@ from django.db import backend, connection, transaction, DEFAULT_DB_ALIAS
 from django.test import TestCase, TransactionTestCase, skipUnlessDBFeature
 
 from models import (Book, Award, AwardNote, Person, Child, Toy, PlayedWith,
-    PlayedWithNote, Contact, Email, Researcher)
+    PlayedWithNote, Contact, Email, Researcher, Food, Eaten)
 
 
 # Can't run this test under SQLite, because you can't
@@ -119,6 +119,16 @@ class DeleteCascadeTransactionTests(TransactionTestCase):
 
         email.delete()
 
+    def test_to_field(self):
+        """
+        Cascade deletion works with ForeignKey.to_field set to non-PK.
+
+        """
+        apple = Food.objects.create(name="apple")
+        eaten = Eaten.objects.create(food=apple, meal="lunch")
+
+        apple.delete()
+
 class LargeDeleteTests(TestCase):
     def test_large_deletes(self):
         "Regression for #13309 -- if the number of objects > chunk size, deletion still occurs"