DRF一对多序列化和反序列化

• models.py

  # 商品分类
  class Category(models.Model):
      name = models.CharField(max_length=32)
  
  # 商品
  class Goods(models.Model):
      name = models.CharField(max_length=32)
      price = models.DecimalField(max_digits=9,decimal_places=2)
      cate = models.ForeignKey(to='Category',on_delete=models.CASCADE)

• urls.py

  from django.urls import path,include
  from . import views
  urlpatterns = [
      path('goods/',views.GoodsView.as_view()),
  ]

• seralizers.py

  # 序列化
  class GoodsSerializer(serializers.ModelSerializer):
      # 如果想查出分类名称 CharField(source='<本model中的外键>.<外键指向的model的相应属性>')
      cate_name = serializers.CharField(source='cate.name')
      class Meta:
          model=Goods
          fields = ('cate_name','name','price')
  
  # 反序列化
  class GoodsUnSerializer(serializers.Serializer):
      name = serializers.CharField(max_length=32)
      price = serializers.DecimalField(max_digits=9,decimal_places=2)
      cate = serializers.IntegerField()
  
      # 添加
      def create(self, data):
          return Goods.objects.create(
              cate_id = data.pop('cate'),
              **data
          )
      # 编辑
      def update(self,instance,data):
          return instance.update(
            cate_id = data.pop('cate'),
              **data
          )
  

• views.py

  class GoodsView(APIView):
    # 查询
      def get(self,request):
          goods = models.Goods.objects.all()
          gs = GoodsSerializer(goods,many=True)
          return Response(gs.data)
  
    # 添加
      def post(self,request):
          dic = {"name":"金丝猴","price":132,'cate':3}
          gs = GoodsUnSerializer(data=dic)
          if gs.is_valid():
              gs.save()
              return HttpResponse('ok')
          return HttpResponse('error')
  
      # 更新
      def put(self,request):
          obj = models.Goods.objects.filter(id=1)
          dic = {"name":"金丝猴123","price":234,'cate':2}
          gs = GoodsUnSerializer(obj,data=dic)
          if gs.is_valid():
              gs.save()
              return HttpResponse('put-ok')
          return HttpResponse('put-error')