1 files changed, 12 insertions, 1 deletions
diff --git a/lib/sqlalchemy/util.py b/lib/sqlalchemy/util.py
index 3636d5523..bd40039d4 100644
--- a/lib/sqlalchemy/util.py
+++ b/lib/sqlalchemy/util.py
@@ -57,7 +57,18 @@ class ArgSingleton(type):
             instance = type.__call__(self, *args)
             ArgSingleton.instances[hashkey] = instance
             return instance
-        
+
+def get_cls_kwargs(cls):
+    """return the full set of legal kwargs for the given cls"""
+    kw = []
+    for c in cls.__mro__:
+        cons = c.__init__
+        if hasattr(cons, 'func_code'):
+            for vn in cons.func_code.co_varnames:
+                if vn != 'self':
+                    kw.append(vn)
+    return kw
+                        
 class SimpleProperty(object):
     """a "default" property accessor."""
     def __init__(self, key):