def _inject_long_term_attribute(self, sender, data, **kwargs):
long_term_room_ids = {
room.id
for room, value in Room.find_with_attribute('long-term')
if value.lower() in ('true', '1', 'yes')
}
for room in data:
room['is_long_term'] = room['id'] in long_term_room_ids
