在 Django 中多态序列化对象

Question

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)

继承的模型是，

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)

和

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)

各自的序列化程序如下，

class RoomSerializer(serializers.ModelSerializer):

    members = UserSerializer(read_only=True, many=True)

    class Meta:

        model = Room

        fields = ('id', 'name', 'status', 'members', 'created', 'modified', 'last_active')

和

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',)

和

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',)

我的问题是我已通过以下方式为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些数据。因此，不是使用RoomSerializerI want 遍历房间列表，如果房间是 ClubRoom，则使用ClubRoomSerializeror else LeagueRoomSerializer。我不确定如何从父对象确定子对象。

有人可以帮我弄这个吗。