feat: BeforeUpdate hook supports update using struct field value

[demoManito]

• Do only one thing
• Non breaking API changes
• Tested

What did this pull request do?

In the BeforeUpdate hook function, if the structure field value is updated and the field has the gorm:"column:field_name" set, the field is updated in SQL

User Case Description

• Code:

type User struct {
	ID      int64 `gorm:"column:id;primary_key"`
	Version int64 `gorm:"column:version"`
	UserID  int64 `gorm:"column:user_id"`
}

// BeforeUpdate gorm hook
func (u *User) BeforeUpdate(*gorm.DB) error {
	u.Version = time.Now().Unix()
	return nil
}

func Update() error {
	return DB().Model(&User{}).Where("id = ?", 1).Update("user_id", 312123).Error
}

• Expected Output:

UPDATE `user` SET `version`=1724247677,`user_id`=312123 WHERE id = 1

[jinzhu]

It's too tricky; it's not recommended to use Hooks for updating values. Instead, it's better to use SQL expressions.

[demoManito]

It's too tricky; it's not recommended to use Hooks for updating values. Instead, it's better to use SQL expressions.

ok thanks