def get_sort_on(allowed_indexes=None):
    """ returns the 'sort_on' from the request
    """
    sort_on = get("sort_on")
    if allowed_indexes and sort_on not in allowed_indexes:
        logger.warn("Index '{}' is not in allowed_indexes".format(sort_on))
        return None
    return sort_on
def get_sort_on ( allowed_indexes = None ) : sort_on = get ( "sort_on" ) if allowed_indexes and sort_on not in allowed_indexes : logger . warn ( "Index '{}' is not in allowed_indexes" . format ( sort_on ) ) return None return sort_on
returns the 'sort_on' from the request