Django rest中的泛型关系

from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from django.db import models

class Comment(models.Model):
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type', 'object_id')
    text = models.TextField()

from rest_framework import serializers
from .models import Comment

class CommentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Comment
        fields = ['id', 'content_type', 'object_id', 'text']

from rest_framework import viewsets
from .models import Comment
from .serializers import CommentSerializer

class CommentViewSet(viewsets.ModelViewSet):
    queryset = Comment.objects.all()
    serializer_class = CommentSerializer

# 假设我们要查询关联到某个文章的所有评论
article_id = 1
content_type = ContentType.objects.get_for_model(Article)
comments = Comment.objects.filter(content_type=content_type, object_id=article_id)

comments = Comment.objects.select_related('content_object').all()