public ActionResult <ProductDTO> GetAttr(string id)
        {
            if (DataHelper.IsEmptyString(id))
            {
                return(BadRequest());
            }
            //
            var re = _productModel.GetAttrDTO(id);

            if (re == null)
            {
                return(Problem(statusCode: 500, detail: "Data not exist"));
            }
            var productDetail = GetListProducts().Find(item => item.Id == id);

            if (productDetail != null)
            {
                re.Discount = productDetail.Discount;
            }
            return(re);
        }