AutoMigrate Error 1091 (42000): Can't DROP 'uni_sys_users_user_name'; check that column/key exists

[aixj1984]

GORM Playground Link

go-gorm/playground#1

Description

version：1.25.10
question： It can only be executed when the table is created for the first time. If it is executed again, as long as there is a unique index in the table, it will prompt that an undefined index cannot be deleted.
-- 只有第一次创建表的时候可以执行，再次执行，只要表有唯一索引，就会提示无法删除一个未定义的索引
error：Error 1091 (42000): Can't DROP 'uni_sys_users_user_name'; check that column/key exists

UserName string gorm:"size:50;column:user_name;comment:登录名称;uniqueIndex:idx_user_name;" json:"userName" // 登录名称