asdf.py

class TaggedItemSerializer(serializers.ModelSerializer):
    def __init__(self, *args, **kwargs):
      serializers.ModelSerializer.__init__(self, *args, **kwargs)
      self.content_object = TaggedItemRelatedField(read_only=True, context=self.context)
      
    tag = TagSerializer()
    #content_object = TaggedItemRelatedField(read_only=True, context=self.context)  wywalić
    content_type = serializers.SerializerMethodField()
    class Meta:
        model = TaggedItem
        fields = ('id', 'tag', 'content_type', 'content_object')
        extra_kwargs = {'content_type': {'context': context}}
    def get_content_type(self, obj):
        return obj.content_type.model