购物车全选

1. 后端接口设计

请求方式 ： PUT /cart/selection/

请求参数： JSON 或 表单

参数	类型	是否必须	说明
selected	bool	是	是否全选，true表示全选，false表示取消全选

返回数据：JSON

返回值	类型	是否必须	说明
message	str	是	ok

2. 后端实现

在carts/serializers.py中新建序列化器

class CartSelectAllSerializer(serializers.Serializer):
    """
    购物车全选
    """
    selected = serializers.BooleanField(label='全选')

在carts/views.py中新建视图

class CartSelectAllView(APIView):
    """
    购物车全选
    """
    def perform_authentication(self, request):
        """
        重写父类的用户验证方法，不在进入视图前就检查JWT
        """
        pass

    def put(self, request):
        serializer = CartSelectAllSerializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        selected = serializer.validated_data['selected']

        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')
            cart = redis_conn.hgetall('cart_%s' % user.id)
            sku_id_list = cart.keys()

            if selected:
                # 全选
                redis_conn.sadd('cart_selected_%s' % user.id, *sku_id_list)
            else:
                # 取消全选
                redis_conn.srem('cart_selected_%s' % user.id, *sku_id_list)
            return Response({'message': 'OK'})
        else:
            # cookie
            cart = request.COOKIES.get('cart')

            response = Response({'message': 'OK'})

            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()
                # 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