porting to ndb, question on repeated=true and _validate/_to_base_type

[Tom Willis]

Glad to discover that there's a group for ndb. 

In our application we had sub-classed StringListProperty to insure that the values in the list were unique simply by doing

    def get_value_for_datastore(self, model_instance):

        #dedupe the underlying list

        lst = list(set(super(UniqueStringListProperty,

                   self).get_value_for_datastore(model_instance)))

        #normalize it and return

        return [x.strip().lower() for x in lst if x is not None \

                and len(x.strip()) > 0]

So I can't figure out how to do this in ndb since _to_base_type gets a single value out of the list at a time. 

I suppose it is possible to put this behavior on the class, but we use this a lot so I was wondering if there is any mechanism on Properties for validation/conversion that operates on all the items at once?

Any ideas?

Thanks In Advance

Tom

[Tom Willis]

geez, and I should actually post to the right group. sorry for the noise everyone.