From 04f8798a856ded8fd433b9ce1d3faf08d8981d8d Mon Sep 17 00:00:00 2001
From: sdghchj <sdghchj@qq.com>
Date: Thu, 31 Dec 2020 09:21:45 +0800
Subject: [PATCH] add tag "ALWAYSUPDATE" to update zero value

---
 callbacks/update.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/callbacks/update.go b/callbacks/update.go
index db5b52fb..2219a953 100644
--- a/callbacks/update.go
+++ b/callbacks/update.go
@@ -239,6 +239,9 @@ func ConvertToAssignments(stmt *gorm.Statement) (set clause.Set) {
 								value = stmt.DB.NowFunc().Unix()
 							}
 							isZero = false
+						} else if isZero {
+							_, isZero = field.TagSettings["ALWAYSUPDATE"]
+							isZero = !isZero
 						}
 
 						if ok || !isZero {