Fixed #18083 -- Fixed cascade deletion with proxy model of concrete subclass. Thanks Simon Charette for report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17887 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/proxy_model_inheritance/tests.py

@@ -1,11 +1,3 @@
-"""
-XX. Proxy model inheritance
-
-Proxy model inheritance across apps can result in syncdb not creating the table
-for the proxied model (as described in #12286).  This test creates two dummy
-apps and calls syncdb, then verifies that the table has been created.
-"""
-
 from __future__ import absolute_import
 
 import os
@@ -14,12 +6,20 @@ import sys
 from django.conf import settings
 from django.core.management import call_command
 from django.db.models.loading import cache, load_app
-from django.test import TransactionTestCase
+from django.test import TestCase, TransactionTestCase
 from django.test.utils import override_settings
 
+from .models import (ConcreteModel, ConcreteModelSubclass,
+    ConcreteModelSubclassProxy)
+
 
 @override_settings(INSTALLED_APPS=('app1', 'app2'))
 class ProxyModelInheritanceTests(TransactionTestCase):
+    """
+    Proxy model inheritance across apps can result in syncdb not creating the table
+    for the proxied model (as described in #12286).  This test creates two dummy
+    apps and calls syncdb, then verifies that the table has been created.
+    """
 
     def setUp(self):
         self.old_sys_path = sys.path[:]
@@ -41,3 +41,19 @@ class ProxyModelInheritanceTests(TransactionTestCase):
         from .app2.models import NiceModel
         self.assertEqual(NiceModel.objects.all().count(), 0)
         self.assertEqual(ProxyModel.objects.all().count(), 0)
+
+
+class MultiTableInheritanceProxyTest(TestCase):
+
+    def test_model_subclass_proxy(self):
+        """
+        Deleting an instance of a model proxying a multi-table inherited
+        subclass should cascade delete down the whole inheritance chain (see
+        #18083).
+
+        """
+        instance = ConcreteModelSubclassProxy.objects.create()
+        instance.delete()
+        self.assertEqual(0, ConcreteModelSubclassProxy.objects.count())
+        self.assertEqual(0, ConcreteModelSubclass.objects.count())
+        self.assertEqual(0, ConcreteModel.objects.count())