From 948832640a5c0aace5812d874b17b8159701135c Mon Sep 17 00:00:00 2001
From: antao <antao2002@gmail.com>
Date: Thu, 6 Dec 2018 18:06:17 +0800
Subject: [PATCH] Update Mapper.h

---
 orm_lib/inc/drogon/orm/Mapper.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/orm_lib/inc/drogon/orm/Mapper.h b/orm_lib/inc/drogon/orm/Mapper.h
index d652b3ab..eab8cd1a 100644
--- a/orm_lib/inc/drogon/orm/Mapper.h
+++ b/orm_lib/inc/drogon/orm/Mapper.h
@@ -98,7 +98,7 @@ class Mapper
                 const ExceptionCallback &ecb) noexcept;
     std::future<T> insertFuture(const T &) noexcept;
 
-    size_t update(T &obj) noexcept(false);
+    size_t update(const T &obj) noexcept(false);
     void update(const T &obj,
                 const CountCallback &rcb,
                 const ExceptionCallback &ecb) noexcept;
@@ -771,7 +771,7 @@ inline std::future<T> Mapper<T>::insertFuture(const T &obj) noexcept
     return prom->get_future();
 }
 template <typename T>
-inline size_t Mapper<T>::update(T &obj) noexcept(false)
+inline size_t Mapper<T>::update(const T &obj) noexcept(false)
 {
     clear();
     static_assert(!std::is_same<typename T::PrimaryKeyType, void>::value, "No primary key in the table!");