def formatter(self, api_client, data, newval):
raise NotImplementedError<EOL>
Format Value for Model

        The return value of this method is used as a value for the field in the
        model of which this field is a member

        api_client
            instance of a Pandora API client
        data
            complete JSON data blob for the parent model of which this field is
            a member
        newval
            the value of this field as retrieved from the JSON data after
            having resolved default value logic