Finish 0.2.3

business_logic/models/node.py

@@ -42,10 +42,16 @@ def add_root(cls, **kwargs):
         return super(Node, cls).add_root(**kwargs)
 
     def delete(self):
-        if self.object_id and self.content_object:
+        if (
+            self.object_id and
+            self.content_object and
+            self.content_type.app_label == ContentType.objects.get_for_model(self.__class__).app_label
+        ):
             self.content_object.delete()
+
         for child in self.get_children():
             child.delete()
+
         return super(Node, self).delete()
 
     def add_child(self, **kwargs):

tests/test_node.py

@@ -133,6 +133,17 @@ def test_delete_with_lost_content_object(self):
 
         root.delete()
 
+    def test_node_deletion_should_not_delete_content_objects_from_other_apps(self):
+        root = Node.add_root()
+        test_model = TestModel.objects.create()
+        root.add_child(content_object=test_model)
+        root = Node.objects.get(id=root.id)
+
+        root.delete()
+
+        self.assertTrue(TestModel.objects.filter(id=test_model.id))
+        self.assertFalse(Node.objects.all())
+
     def test_statement_or_block(self):
         root = Node.add_root()
         self.failUnless(root.is_block())