我正在写一个CommentSerializer，因为它的一个字段是originalPost。 Post已经写了PostSerializer。在模型中，Comment继承了Post，但仅有originalPost作为附加字段。两者的代码如下：

class PostSerializer(serializers.ModelSerializer):
    poster = UserSerializer()
    community = CommunitySerializer()

    class Meta:
        model = Post
        fields = ['post','community','poster','id']

    def create(self,validated_data):
        userData = validated_data.pop('poster')
        user = User.objects.get_or_create(username=userData['username'],email=userData['email'],first_name=userData['first_name'],last_name=userData['last_name'],password=userData['password'])[0]
        validated_data['poster'] = user

        communityData = validated_data.pop('community')
        community = Community.objects.get_or_create(name=communityData['name'])[0]
        validated_data['community'] = community

        post = Post.objects.create(**validated_data)
        return post

class CommentSerializer(serializers.ModelSerializer):
    poster = UserSerializer()
    community = CommunitySerializer()
    originalPost = PostSerializer()
    class Meta:
        model = Comment
        fields = ['post','originalPost']

    def create(self,password=userData['password'])[0]
        validated_data['poster'] = user
        communityData = validated_data.pop('community')
        community = Community.objects.get_or_create(name=communityData['name'])[0]
        validated_data['community'] = community

        originalPostData = validated_data.pop('originalPost')
        originalPost = Post.objects.get_or_create(id = originalPostData['id'])[0]
        validated_data['originalPost'] = originalPost

        comment = Comment.objects.create(**validated_data)
        return comment

我的问题是我将以下comment1通过了我的createComment测试：

self.postWithId = {'post': 'post text','community': self.community1,'poster': self.user1,'id': 1}
self.comment1 = {'post': 'comment text','originalPost': self.postWithId}

很明显，我的评论的originalPost字段应该有一个id字段，但是当到达此行时  originalPost = Post.objects.get_or_create(id = originalPostData['id'])[0]在CommentSerializer中出现键错误，因为似乎id字段已从validated_data输入中完全删除。

我一直看到很多相关的帖子说要制作id read_only=False（Django REST Framework nested resource key "id" unaccessible，然后需要我手动设置一个id，我这样做对此，我可以采用默认的AutoField行为。