From 59730417aabd5b510d66d9d923d265a6fc0195a0 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Wed, 23 Dec 2020 17:31:47 +0800
Subject: [PATCH] Fix auto migrate field with customized field type, close
 https://github.com/go-gorm/mysql/issues/20

---
 migrator/migrator.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/migrator/migrator.go b/migrator/migrator.go
index 084d430f..a475d307 100644
--- a/migrator/migrator.go
+++ b/migrator/migrator.go
@@ -381,7 +381,7 @@ func (m Migrator) MigrateColumn(value interface{}, field *schema.Field, columnTy
 
 	// check precision
 	if precision, _, ok := columnType.DecimalSize(); ok && int64(field.Precision) != precision {
-		if strings.Contains(m.DataTypeOf(field), fmt.Sprint(field.Precision)) {
+		if regexp.MustCompile(fmt.Sprintf("[^0-9]%d[^0-9]", field.Precision)).MatchString(m.DataTypeOf(field)) {
 			alterColumn = true
 		}
 	}