如何在父类别中创建类别本身而不仅仅是 id

Question

I'm using Django Rest Framework for API and I wrote the model Category in which I have parent and I'm using it like this: parent = models.ForeignKey('self', on_delete=models.CASCADE, null=True, blank=True)在 API 中，它看起来像这样：

{
    "id": 7,
    "name": "softwares",
    "img": "",
    "parent": 1
},
{
    "id": 8,
    "name": "databases",
    "img": "",
    "parent": 1
},
{
    "id": 9,
    "name": "appearance",
    "img": "",
    "parent": 2
},
{
    "id": 10,
    "name": "media",
    "img": "",
    "parent": 2
},
{
    "id": 11,
    "name": "system",
    "img": "",
    "parent": 2
},

这是类别序列化程序：

class CategorySerializer(serializers.ModelSerializer):

    class Meta:
        model = Category
        fields = '__all__'

和类别视图集：

class CategoryViewSet(viewsets.ModelViewSet):

    queryset = Category.objects.all()
    serializer_class = CategorySerializer

    action_to_serializer = {
        "retrieve": CategoryDetailSerializer,
    }

    def get_serializer_class(self):
        return self.action_to_serializer.get(
            self.action,
            self.serializer_class
        )

如何制作类别本身而不仅仅是 id？

Answer 1

假设您不会处理无限序列的关系并且只使用一级父级来处理它，您可以通过使用nested serializers器来实现这一点，您的场景中的示例将是这样的：

class NestedCategorySerializer(serializers.ModelSerializer):
    class Meta:
        model = Category
        fields = ('id', 'name', 'img')

class CategorySerializer(serializers.ModelSerializer):
    parent = NestedCategorySerializer()

    class Meta:
        model = Category
        fields = '__all__'

如果您的关系需要更多深度级别，您可以改进此示例以始终包括序列化父级 - 小心循环。