Xtykutl

I have the following object inheritance model.

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)

And the inherited models are,

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)

and

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)

The respective Serializers are as follows,

class RoomSerializer(serializers.ModelSerializer):

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



    class Meta:

        model = Room

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

and

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',)

and

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',)

My problem is that I have fetched all rooms for an user in the following manner.

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

Now I want to Serialize this data based on the room type. Thus instead of using the RoomSerializer I want to traverse the list of rooms and if the room is ClubRoom, then use ClubRoomSerializer or else LeagueRoomSerializer.
I'm not sure how to determine the child object from the parent.

Can someone help me with this.

class RoomSerializer(serializers.Serializer):

    def to_representation(self, instance):

        if isinstance(instance, LeagueRoom)

            serializer_class = LeagueRoomSerializer

        elif isinstance(instance, ClubRoom):

            serializer_class = ClubRoomSerializer

        return serializer_class(instance=instance).data



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

serialized = RoomSerializer(queryset, many=True).data