def from_json(self, json_string):
        """Override current FlatTable using data from json.

        :param json_string: JSON String
        :type json_string: str
        """

        obj = json.loads(json_string)
        self.from_dict(obj['groups'], obj['data'])

        return self
Override current FlatTable using data from json.

        :param json_string: JSON String
        :type json_string: str