Hi,

I found a bug in FilterMapping class of the z3c.multiform package. Basically the problem is due to the way the __len__ method is computed.


Attached is a tiny patch for this bug. Feel free to use any copyright ownership you want for it.

Regards

Lorenzo
Index: multiform/gridform.py
===================================================================
--- multiform/gridform.py       (revisión: 69125)
+++ multiform/gridform.py       (copia de trabajo)
@@ -129,7 +129,7 @@
 
     def __len__(self):
         '''See interface `IReadContainer`'''
-        return len(self.keys())
+        return len(tuple(self.keys()))
 
     def __contains__(self, key):
         '''See interface `IReadContainer`'''
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