Сериализация набора объектов, относящихся к разным классам моделей

#models.py:
 
 
class Article(models.Model):
 
     title = models.CharField(max_lenght=1000)
     text = models.TextField(max_length=5000)
 
 
class ArticleVk(Article):
     pass
     #специфические поля
     
 
class ArticleYandex(Article):
     pass
     #специфические поля
 
     
#serializers.py:
 
from rest_framework import serializers
 
from . import models
 
 
class ArticleSerializer(serializers.ModelSerializer):
    def __init__(self, intance, data, **kwargs):
         self.Meta.model = type(instance) if instance else models.Article
         super().__init__(intance=instance, data=data, **kwargs)
 
    class Meta:
         model = models.Article
 
class ArticleListSerializer(serializers.ListSerializer):
 
    def to_representation(self, data):
        ordering = self.context.get('request').query_params.getlist('ordering_content')
        iterable = data.all() if isinstance(data, models.models.Manager) else data
 
        serialized_data = []
 
        for item in iterable.order_by(*ordering):
            serialized_data.append(self.child.to_representation(item))
        return serialized_data
 
 
class GameSerializer(serializers.ModelSerializer):
 
     articles_set = serializers.SerializerMethodField('content_serializer')
 
     
     def article_serializer(self, game):
        context = { 'request': self.context.get('request') }
        article_set = models.Article.objects.filter(games__in=[game]).select_subclasses().distinct()
        serializer = ArticleListSerializer(article_set, many=True, context=context, required=False, child=ArticleSerializer())
        return serializer.data

#models.py:
 
 
class Article(models.Model):
 
     title = models.CharField(max_lenght=1000)
     text = models.TextField(max_length=5000)
 
 
class ArticleVk(Article):
     pass
     #специфические поля
     
 
class ArticleYandex(Article):
     pass
     #специфические поля
 
     
#serializers.py:
 
from rest_framework import serializers
 
from . import models
 
 
class ArticleChildSerializer(serializers.ModelSerializer):
    def __init__(self, intance=None, data=serializers.empty, **kwargs):
         self.Meta.model = type(instance) if instance else models.Article
         super().__init__(intance=instance, data=data, **kwargs)
 
    class Meta:
         model = models.Article
 
class ArticleListSerializer(serializers.ListSerializer):
 
    def to_representation(self, data):
        ordering = self.context.get('request').query_params.getlist('ordering_content')
        iterable = data.all() if isinstance(data, models.models.Manager) else data
 
        serialized_data = []
 
        for item in iterable.order_by(*ordering):
            self.child = ArticleChildSerializer(item)
            serialized_data.append(self.child.to_representation(item))
        return serialized_data
 
class ArticleSerializer(serializers.ListSerializer):
 
      class Meta:
          list_serializer_class = ArticleListSerializer
 
class GameSerializer(serializers.ModelSerializer):
 
     articles_set = serializers.SerializerMethodField('article_serializer')
 
     
     def article_serializer(self, game):
        context = { 'request': self.context.get('request') }
        article_set = models.Article.objects.filter(games__in=[game]).select_subclasses().distinct()
        serializer = ArticleSerializer(article_set, many=True, context=context, required=False, child=ArticleChildSerializer())
        return serializer.data