Fix cache of Predicate.asPredicate

product/ERP5Type/Core/Predicate.py

@@ -585,16 +585,13 @@ class Predicate(XMLObject):
   def asPredicate(self, script_id=None):
     """
       This method tries to convert the current Document into a predicate
-      looking up methods named Class_asPredictae, MetaType_asPredicate, PortalType_asPredicate
+      looking up methods named Class_asPredicate, MetaType_asPredicate, PortalType_asPredicate
     """
     cache = getTransactionalVariable()
-    key = id(self), script_id
-    if 'asPredicate' in cache:
-      cache = cache['asPredicate']
-      if key in cache:
+    key = 'asPredicate', self, script_id
+    try:
       return cache[key]
-    else:
-      cache = cache['asPredicate'] = {}
+    except KeyError:
       script = self._getTypeBasedMethod('asPredicate', script_id)
       if script is not None:
         self = script()