delete tables in an inheritance rel. requires them in reverse

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/sqlalchemy/mapping/mapper.py b/lib/sqlalchemy/mapping/mapper.py
index 8239df99c..6a7eb9659 100644
--- a/lib/sqlalchemy/mapping/mapper.py
+++ b/lib/sqlalchemy/mapping/mapper.py
@@ -636,7 +636,9 @@ class Mapper(object):
     def delete_obj(self, objects, uow):
         """called by a UnitOfWork object to delete objects, which involves a
         DELETE statement for each table used by this mapper, for each object in the list."""
-        for table in self.tables:
+        l = list(self.tables)
+        l.reverse()
+        for table in l:
             if not self._has_pks(table):
                 continue
             delete = []