def create_stream(pigeon_id, name, cover_url, sub_list, tag_list):
pigeon_key = ndb.Key(Pigeon, pigeon_id)
stream = Stream()
stream.key = ndb.Key(Stream, name, parent=pigeon_key)
stream.name = name
stream.cover_url = cover_url
stream.tags = tag_list
stream.put()
for pid in sub_list:
if pid != pigeon_id:
if not pigeon_exists(pid):
create_pigeon(pid)
suber_key = ndb.Key(Pigeon, pid)
sub = Subscription()
sub.Pigeon_key = suber_key
sub.Stream_key = stream.key
sub.put()
return
