- [bug] When the primary key column of a Table

    is replaced, such as via extend_existing,
    the "auto increment" column used by insert()
    constructs is reset.  Previously it would
    remain referring to the previous primary
    key column.  [ticket:2525]

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/sqlalchemy/util/langhelpers.py b/lib/sqlalchemy/util/langhelpers.py
index ac4b5527a..7fe5d3e82 100644
--- a/lib/sqlalchemy/util/langhelpers.py
+++ b/lib/sqlalchemy/util/langhelpers.py
@@ -537,6 +537,8 @@ class memoized_property(object):
         obj.__dict__[self.__name__] = result = self.fget(obj)
         return result
 
+    def _reset(self, obj):
+        obj.__dict__.pop(self.__name__, None)
 
 class memoized_instancemethod(object):
     """Decorate a method memoize its return value.