全选购物车

提示：在购物车页面修改购物车使用局部刷新的效果。

1. 全选购物车接口设计和定义

1.请求方式

2.请求参数：JSON

3.响应结果：JSON

4.后端接口定义

class CartsSelectAllView(View):
    """全选购物车"""

    def put(self, request):
        # 接收和校验参数
        # 判断用户是否登录
        user = request.user
        if user.is_authenticated:
            # 用户已登录，操作redis购物车
            pass
        else:
            # 用户未登录，操作cookie购物车
            pass

2. 全选购物车后端逻辑实现

1.接收和校验参数

class CartsSelectAllView(View):
    """全选购物车"""

    def put(self, request):
        # 接收参数
        json_dict = json.loads(request.body.decode())
        selected = json_dict.get('selected', True)

        # 校验参数
        if selected:
            if not isinstance(selected, bool):
                return http.HttpResponseForbidden('参数selected有误')

        # 判断用户是否登录
        user = request.user
        if user is not None and user.is_authenticated:
            # 用户已登录，操作redis购物车
            pass
        else:
            # 用户已登录，操作cookie购物车
            pass

2.全选Redis购物车

class CartsSelectAllView(View):
    """全选购物车"""

    def put(self, request):
        # 接收和校验参数
        ......

        # 判断用户是否登录
        user = request.user
        if user is not None and user.is_authenticated:
            # 用户已登录，操作redis购物车
            redis_conn = get_redis_connection('carts')
            cart = redis_conn.hgetall('carts_%s' % user.id)
            sku_id_list = cart.keys()
            if selected:
                # 全选
                redis_conn.sadd('selected_%s' % user.id, *sku_id_list)
            else:
                # 取消全选
                redis_conn.srem('selected_%s' % user.id, *sku_id_list)
            return http.JsonResponse({'code': RETCODE.OK, 'errmsg': '全选购物车成功'})
        else:
            # 用户已登录，操作cookie购物车
            pass

3.全选cookie购物车

class CartsSelectAllView(View):
    """全选购物车"""

    def put(self, request):
        # 接收和校验参数
        ......

        # 判断用户是否登录
        user = request.user
        if user is not None and user.is_authenticated:
            # 用户已登录，操作redis购物车
            ......
        else:
            # 用户已登录，操作cookie购物车
            cart = request.COOKIES.get('carts')
            response = http.JsonResponse({'code': RETCODE.OK, 'errmsg': '全选购物车成功'})
            if cart is not None:
                cart = pickle.loads(base64.b64decode(cart.encode()))
                for sku_id in cart:
                    cart[sku_id]['selected'] = selected
                cookie_cart = base64.b64encode(pickle.dumps(cart)).decode()
                response.set_cookie('carts', cookie_cart, max_age=constants.CARTS_COOKIE_EXPIRES)

            return response