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()
