修改购物车数据

1. 后端接口设计

请求方式 ： PUT /cart/

请求参数： JSON 或 表单

返回数据： JSON

2. 后端实现

在carts/views.py中修改视图，添加put方法

 class CartView(APIView):
    ...

    def put(self, request):
        """
        修改购物车数据
        """
        serializer = CartSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        sku_id = serializer.validated_data.get(‘sku_id‘)
        count = serializer.validated_data.get(‘count‘)
        selected = serializer.validated_data.get(‘selected‘)

        # 尝试对请求的用户进行验证
        try:
            user = request.user
        except Exception:
            # 验证失败，用户未登录
            user = None

        if user is not None and user.is_authenticated:
            # 用户已登录，在redis中保存
            redis_conn = get_redis_connection(‘cart‘)
            pl = redis_conn.pipeline()
            pl.hset(‘cart_%s‘ % user.id, sku_id, count)
            if selected:
                pl.sadd(‘cart_selected_%s‘ % user.id, sku_id)
            else:
                pl.srem(‘cart_selected_%s‘ % user.id, sku_id)
            pl.execute()
            return Response(serializer.data)
        else:
            # 用户未登录，在cookie中保存
            # 使用pickle序列化购物车数据，pickle操作的是bytes类型
            cart = request.COOKIES.get(‘cart‘)
            if cart is not None:
                cart = pickle.loads(base64.b64decode(cart.encode()))
            else:
                cart = {}

            cart[sku_id] = {
                ‘count‘: count,
                ‘selected‘: selected
            }
            cookie_cart = base64.b64encode(pickle.dumps(cart)).decode()

            response = Response(serializer.data)
            # 设置购物车的cookie
            # 需要设置有效期，否则是临时cookie
            response.set_cookie(‘cart‘, cookie_cart, max_age=constants.CART_COOKIE_EXPIRES)
            return response

原文地址：https://www.cnblogs.com/hzlnice/p/9393125.html