'Returns the extra property by deserializing json.'

@property
def extra_dejson(self):

    obj = {}
    if self.extra:
        try:
            obj = json.loads(self.extra)
        except Exception as e:
            logging.exception(e)
            logging.error(u'Failed    parsing    the    json    for    conn_id    %s', self.conn_id)
    return obj
