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); }