moved dict init to setattr for auto-__init__ thing

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sqlalchemy/mapping/__init__.py b/lib/sqlalchemy/mapping/__init__.py
index 2bcdcabd0..fcfa17fe0 100644
--- a/lib/sqlalchemy/mapping/__init__.py
+++ b/lib/sqlalchemy/mapping/__init__.py
@@ -137,7 +137,7 @@ def assign_mapper(class_, *args, **params):
     if not isinstance(getattr(class_, '__init__'), types.MethodType):
         def __init__(self, **kwargs):
              for key, value in kwargs.items():
-                 self.__dict__[key] = value
+                 setattr(self, key, value)
         class_.__init__ = __init__
     m = mapper(class_, *args, **params)
     class_.mapper = m