每次保存时如何将 NOW() 保存到 Laravel Eloquent 模型中的同一字段？
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How to save NOW() to the same field in my Laravel Eloquent model every time I save?
提问by prograhammer
Every time I perform the following:
每次我执行以下操作：
$user = new User;
$user->name = 'John';
$user->save();
I want a field called "modified" to be updated to NOW()in MySQL. I can't use Laravel's timestamps because I'm only using a single modified field. I could rely on MySQL to do this for me, but I was wondering if there was a way to accomplish this in my Laravel model? Perhaps using a mutator in some way to set this before saving?
我想NOW()在 MySQL 中更新一个名为“修改”的字段。我不能使用 Laravel 的时间戳，因为我只使用了一个修改过的字段。我可以依靠 MySQL 来为我做这件事，但我想知道是否有办法在我的 Laravel 模型中完成此任务？也许在保存之前以某种方式使用 mutator 来设置它？
As a bonus:how would I do something like this $user->modified = "NOW()"? (which is obviously wrong, but hopefully demonstrates the point)
作为奖励：我将如何做这样的事情$user->modified = "NOW()"？（这显然是错误的，但希望能证明这一点）
回答by Joseph Silber
You can accomplish this in the savingevent, for which you can register a callback in you model's bootmethod:
您可以在saving事件中完成此操作，您可以在模型的boot方法中注册回调：
class User extends Eloquent {
public static function boot()
{
static::saving(function($user)
{
$user->modified = DB::raw('NOW()');
// Alternatively, you can use this:
$user->modified = Carbon\Carbon::now();
});
parent::boot();
}
}
