1、显示当前用户的购物车数据

            逻辑：需要用到用户id去购物车数据表进行过滤，返回一个购物车数据列表；

            继承类：ListAPIView

             属性：序列化器，queryset=Cart，authentication_classes=[ ]

具体代码部分：

class CartAPI(ListAPIView):

queryset = Cart.objects.all()

serializer_class = CartItemSerializer

# 需要登录的认证 保证用户是登录的

authentication_classes = [LoginAuthentication]

# 由于前端需要的是如下字典类型，所以需要重写List# this.carts = data.carts;# this.total_price = data.total_price;

def list(self, request, *args, **kwargs):

    queryset = self.filter_queryset(self.get_queryset())

    page = self.paginate_queryset(queryset)

    if page is not None:

        serializer = self.get_serializer(page, many=True)

        return self.get_paginated_response(serializer.data)

        serializer = self.get_serializer(queryset, many=True)

        result = { "cart": serializer.data, "total_price": 0 }

        return Response({"data": result})