Django_rest_framework的fserializers嵌套方法,获取二级/三级数据，直接输出多维数组；用来取代for循环重组数组

serializers.py文件
# -*- coding: utf-8 -*-

from rest_framework import serializers
from goods.models import Goods, GoodsCategory

class GoodsCategory(models.Model):
    """
    商品类别
    """
    CATEGORY_TYPE = (
        (1, "一级类目"),
        (2, "二级类目"),
        (3, "三级类目"),
    )

    name = models.CharField(default="", max_length=30, verbose_name="类别名", help_text="类别名")
    code = models.CharField(default="", max_length=30, verbose_name="类别code", help_text="类别code")
    desc = models.TextField(default="", verbose_name="类别描述", help_text="类别描述")
    category_type = models.IntegerField(choices=CATEGORY_TYPE, verbose_name="类目级别", help_text="类目级别")
    parent_category = models.ForeignKey("self", null=True, blank=True, verbose_name="父类目级别", help_text="父目录",
                                        related_name="sub_cat")
    is_tab = models.BooleanField(default=False, verbose_name="是否导航", help_text="是否导航")
    add_time = models.DateTimeField(default=datetime.now, verbose_name="添加时间")

    class Meta:
        verbose_name = "商品类别"
        verbose_name_plural = verbose_name

    def __str__(self):
        return self.name


class CategorySerializer3(serializers.ModelSerializer):
    class Meta:
        model = GoodsCategory
        fields = "__all__"

class CategorySerializer2(serializers.ModelSerializer):
    sub_cat = CategorySerializer3(many=True)
    class Meta:
        model = GoodsCategory
        fields = "__all__"

class CategorySerializer(serializers.ModelSerializer):
    sub_cat = CategorySerializer2(many=True)
    class Meta:
        model = GoodsCategory
        fields = "__all__"


views.py 文件
from rest_framework import mixins
from rest_framework import filters
from rest_framework.pagination import PageNumberPagination
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import viewsets
from rest_framework_extensions.cache.mixins import CacheResponseMixin
from .filters import GoodsFilter
from .serializers import GoodsSerializer, CategorySerializer, HotWordsSerializer, BannerSerializer

class CategoryViewset(mixins.ListModelMixin, mixins.RetrieveModelMixin, viewsets.GenericViewSet):
    """
    list:
        商品分类列表数据
    retrieve:
        获取商品分类详情
    """
    queryset = GoodsCategory.objects.filter(category_type=1)
    serializer_class = CategorySerializer