def METHOD_NAME(data):
    """
    when a person opens the playlist page he immediately enters the
    websocket room. This way he can see in live which people are in the
    review room. The user still has to explicitly enter the review room
    to actually be in sync with the other users
    """
    room, room_id = _get_room_from_data(data)
    rooms_data[room_id] = room
    join_room(room_id)
    emit("preview-room:room-people-updated", room, room=room_id)