Django rest框架序列化多对多字段

Question

如何将多对多字段序列化为列表，然后通过rest框架返回它们？在下面的示例中，我尝试返回该帖子以及与其关联的标签列表。

models.py

class post(models.Model):
    tag = models.ManyToManyField(Tag)
    text = models.CharField(max_length=100)

serializers.py

class PostSerializer(serializers.ModelSerializer):
    class Meta:
        model = Post
        fields = ("text", "tag"??)

views.py

class PostViewSet(viewsets.ReadOnlyModelViewSet):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

Answer 1

你将需要一个TagSerializer，其class Meta有model = Tag。之后TagSerializer被创建，修改PostSerializer与many=True一个ManyToManyField关系：

class PostSerializer(serializers.ModelSerializer):
    tag = TagSerializer(read_only=True, many=True)

    class Meta:
        model = Post
        fields = (tag, text,)