>>> room = Room(name=u"Traquair Room", divided=False)
    >>> room.save()
    >>> room.name
    u'Traquair Room'
    >>> room.divided
    False

    >>> room2 = Room(name=u'Boclair Room', divided=True)
    >>> room2.save()
    >>> room2.name
    u'Boclair Room'
    >>> room2.divided
    True

    >>> room2.parents.add(room)
    >>> room2.save()
    >>> room2.parents.all()
    [<Room: Traquair Room>]
    >>> room.room_divisions_set.all()
    [<Room: Boclair Room>]