简单的增删查改接口，其中增，改需要进行反序列化和校验：

    1. class GoodsView1(APIView):
    2.     authentication_classes = []
    3.     permission_classes = []
    4.     throttle_classes = [VisitLimit, ]
    5.     def get(self,request):
    6.         """查所有数据或（如果带有id证明是查一个）"""
    7.         id = request.query_params.get('id')
    8.         if not id:
    9.             goods = Goods.objects.all()
    10.             serializer = GoodsSerializer(goods,many=True)
    11.         else:
    12.             goods_obj = get_object_or_404(Goods,id=id)
    13.             serializer = GoodsSerializer(goods_obj)
    14.         return Response(serializer.data)
    17.     def post(self,request):
    18.         """增接口"""
    19.         data = request.data
    20.         # 只需用data关键字把待反序列化的数据传进去
    21.         serializer = GoodsSerializer(data=data)
    22.         if serializer.is_valid():
    23.             serializer.save()
    24.             return Response(serializer.data)
    25.         return Response(serializer.errors)
    28.     def delete(self,request):
    29.         """删接口，查询单个和这个删除以及更新接口我都是?id=1这样传参，可以统一接口url，如果在url传参路由就会要重新定义"""
    30.         id = request.query_params.get('id')
    31.         if id:
    32.             book_obj = get_object_or_404(Goods,id=id)
    33.             book_obj.delete()
    34.             return Response("删除成功")
    35.         return Response("您必须传入待删除的id，不能一次性全删")
    37.     def patch(self,request):
    38.         """更新接口"""
    39.         id = request.query_params.get('id')
    40.         if id:
    41.             book_obj = get_object_or_404(Goods, id=id)
    42.             # instance是待修改的对象，data是修改的内容
    43.             serializer = GoodsSerializer(data=request.data, instance=book_obj)
    44.             if serializer.is_valid():
    45.                 serializer.save()
    46.                 # 更新成功后返回更新的这条记录
    47.                 return Response(serializer.data)
    48.             return Response(serializer.errors)
    49.         return Response("您必须传入待更新的id")