def custom(self, ref, context=None):
        if ref is None:
            return True
        else:
            return ( not self.builtin(ref, context) )
Deserialize the field's JSON string data.
dataset/ETHPy150Open jumoconnect/openjumo/jumodjango/lib/suds/xsd/schema.py/Schema.custom--crossover with--dataset/ETHPy150Open deis/deis/controller/api/serializers.py/JSONStringFieldSerializer.to_internal_value