def find_nameid(self, userid, **kwargs):
        """
        Find a set of NameID's that matches the search criteria.

        :param userid: User id
        :param kwargs: The search filter a set of attribute/value pairs
        :return: a list of NameID instances
        """
        res = []
        try:
            _vals = self.db[userid]
        except KeyError:
            logger.debug("failed to find userid %s in IdentDB", userid)
            return res

        for val in _vals.split(" "):
            nid = decode(val)
            if kwargs:
                for key, _val in kwargs.items():
                    if getattr(nid, key, None) != _val:
                        break
                else:
                    res.append(nid)
            else:
                res.append(nid)

        return res
Find a set of NameID's that matches the search criteria.

        :param userid: User id
        :param kwargs: The search filter a set of attribute/value pairs
        :return: a list of NameID instances