def to_internal_value(self, data):
        field = super(JSONStringFieldSerializer, self).to_internal_value(data)

        for k, v in field.viewitems():
            if v is not None:  # NoneType is used to unset a value
                field[k] = unicode(v)

        return field
Deserialize the field's JSON string data.
dataset/ETHPy150Open deis/deis/controller/api/serializers.py/JSONStringFieldSerializer.to_internal_value