Ticket #14896: django-14896.diff

tests/regressiontests/delete_regress/models.py

@@ -35 +35 @@
 class PlayedWithNote(models.Model):
     played = models.ForeignKey(PlayedWith)
     note = models.TextField()
+
+
+class Contact(models.Model):
+    label = models.CharField(max_length=100)
+
+class Email(Contact):
+    email_address = models.EmailField(max_length=100)
+
+class Researcher(Contact):
+    contacts = models.ManyToManyField(Contact, related_name="research_contacts")

tests/regressiontests/delete_regress/tests.py

@@ -4 +4 @@
 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
+from models import (Book, Award, AwardNote, Person, Child, Toy, PlayedWith,
+    PlayedWithNote, Contact, Email, Researcher)
 
 
 # Can't run this test under SQLite, because you can't
@@ -108 +109 @@
         # first two asserts just sanity checks, this is the kicker:
         self.assertEquals(PlayedWithNote.objects.count(), 0)
 
+    def test_inheritance(self):
+        r = Researcher.objects.create(label="Carl")
+        email = Email.objects.create(
+            label="office-email", email_address="carl@science.edu"
+        )
+        r.contacts.add(email)
+
+        email.delete()
+
 class LargeDeleteTests(TestCase):
     def test_large_deletes(self):
         "Regression for #13309 -- if the number of objects > chunk size, deletion still occurs"