def get_by_listing(cls, listing): q = add_filters(cls.all(), ('listing', ), (listing, )) return q
def get_by_target(cls, target): q = add_filters(cls.all(), ('target', ), (target, )) return q
def get_by_source(cls, bid, listing, source): q = add_filters(cls.all(), ('bid', 'listing', 'source'), (bid, listing, source)) return q.get()