我有以下对象继承模型：

class Room:
    name = models.CharField(db_index=True, unique=True, max_length=255)
    status = models.CharField(default=RoomStatus.ACTIVE, max_length=256, null=True)
    members = models.ManyToManyField(User)
    last_activity = models.DateTimeField(default=timezone.now)

继承的模型为：

class LeagueRoom(Room):
    league = models.ForeignKey(League, on_delete=models.CASCADE, null=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, null=True)
    logo_url = models.CharField(max_length=1024, null=True)

以及：

class ClubRoom(Room):
    club = models.ForeignKey(Club, on_delete=models.CASCADE, null=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, null=True)
    logo_url = models.CharField(max_length=1024, null=True)

各个序列化程序如下所示：

class RoomSerializer(serializers.ModelSerializer):
    members = UserSerializer(read_only=True, many=True)

    class Meta:
        model = Room
        fields = ('id', 'name', 'status', 'members', 'created', 'modified', 'last_active')

以及

class LeagueRoomSerializer(serializers.ModelSerializer):
    location = LocationSerializer(read_only=True)
    league = LeagueSerializer(read_only=True)
    room = RoomSerializer(read_only=True)

    class Meta:
        model = LeagueRoom
        fields = ('id', 'name', 'location', 'status', 'league',
                  'logo_url', 'room', 'created', 'modified',)

以及：

class ClubRoomSerializer(serializers.ModelSerializer):
    location = LocationSerializer(read_only=True)
    club = ClubSerializer(read_only=True)
    room = RoomSerializer(read_only=True)

    class Meta:
        model = ClubRoom
        fields = ('id', 'name', 'location', 'club', 'logo_url',
                  'status', 'room', 'created', 'modified',)

我的问题是，我以下面的方式为一个用户获取了所有房间。

rooms = user.room_set.order_by('-last_activity')

现在我想根据房间类型序列化这个数据。因此，我想遍历房间列表，而不是使用RoomSerializer。如果房间是ClubRoom，则使用ClubRoomSerializer或LeagueRoomSerializer。我如何从父对象中确定子对象？