php 保存后、保存前等的laravel模型回调

laravel model callbacks after save, before save, etc

提问by Orbitum

Are there callbacks in Laravel like:

Laravel 中是否有回调，例如：

afterSave()
beforeSave()
etc

I searched but found nothing. If there are no such things - what is best way to implement it?

我搜索了但一无所获。如果没有这样的事情 - 实施它的最佳方法是什么？

Thanks!

谢谢！

采纳答案by Charly Palencia

Actually, Laravel has real callback before|after save|update|create some model. check this:

实际上，Laravel 有真正的回调之前|之后保存|更新|创建一些模型。检查这个：

https://github.com/laravel/laravel/blob/3.0/laravel/database/eloquent/model.php#L362

https://github.com/laravel/laravel/blob/3.0/laravel/database/eloquent/model.php#L362

the EventListener like saved and saving are the real callbacks

像保存和保存这样的 EventListener 是真正的回调

$this->fire_event('saving'); 

$this->fire_event('saved');

how can we work with that? just assign it to this eventListener example:

我们怎样才能做到这一点？只需将它分配给这个 eventListener 示例：

 \Laravel\Event::listen('eloquent.saving: User', function($user){
  $user->saving();//your event or model function
});

回答by afarazit

The best way to achieve before and after save callbacks in to extend the save()function.

最好的方法是实现前后保存回调中的扩展save()功能。

Here's a quick example

这是一个快速示例

class Page extends Eloquent {

   public function save(array $options = [])
   {
      // before save code 
      parent::save($options);
      // after save code
   }
}

So now when you save a Page object its save()function get called which includes the parent::save()function;

所以现在当你保存一个 Page 对象时，它的save()函数被调用，其中包含该parent::save()函数；

$page = new Page;
$page->title = 'My Title';
$page->save();

回答by Nicodemuz

Adding in an example for Laravel 4:

添加 Laravel 4 的示例：

class Page extends Eloquent {

    public static function boot()
    {
        parent::boot();

        static::creating(function($page)
        {
            // do stuff
        });

        static::updating(function($page)
        {
            // do stuff
        });
    }

}

回答by Laurence

Even though this question has already been marked 'accepted' - I'm adding a new updated answer for Laravel 4.

即使这个问题已经被标记为“已接受” - 我正在为 Laravel 4 添加一个新的更新答案。

Beta 4 of Laravel 4 has just introduced hook events for Eloquent save events- so you dont need to extend the core anymore:

Laravel 4 的 Beta 4 刚刚为 Eloquent 保存事件引入了钩子事件- 所以你不再需要扩展核心：

Added Model::creating(Closure) and Model::updating(Closure) methods for hooking into Eloquent save events. Thank Phil Sturgeon for finally pressuring me into doing this... :)

添加了 Model::creating(Closure) 和 Model::updating(Closure) 方法，用于挂钩 Eloquent 保存事件。感谢 Phil Sturgeon 最终迫使我这样做...... :)

回答by saswanb

In Laravel 5.7, you can create a model observer from the command line like this:

在 Laravel 5.7 中，您可以像这样从命令行创建模型观察者：

php artisan make:observer ClientObserver --model=Client

Then in your app\AppServiceProvider tell the boot method the model to observe and the class name of the observer.

然后在你的 app\AppServiceProvider 中告诉 boot 方法要观察的模型和观察者的类名。

use App\Client;
use App\Observers\ClientObserver;

class AppServiceProvider extends ServiceProvider
{
    public function boot()
   {
        Client::observe(ClientObserver::class);
   }
   ...
}

Then in your app\Observers\ you should find the observer you created above, in this case ClientObserver, already filled with the created/updated/deleted event hooks for you to fill in with your logic. My ClientObserver:

然后在您的 app\Observers\ 中，您应该找到您在上面创建的观察者，在本例中为 ClientObserver，已经填充了 created/updated/deleted 事件挂钩供您填充逻辑。我的客户观察者：

namespace App\Observers;

use App\Client;

class ClientObserver
{

    public function created(Client $client)
    {
        // do your after-model-creation logic here
    }
    ...
}

I really like the simplicity of this way of doing it. Reference https://laravel.com/docs/5.7/eloquent#events

我真的很喜欢这种做法的简单性。参考https://laravel.com/docs/5.7/eloquent#events

回答by safrazik

Your app can break using afarazit solution* Here's the fixed working version:

您的应用程序可能会因使用 afarazit 解决方案而崩溃* 这是固定的工作版本：

NOTE: savingor any other event won't work when you use eloquent outside of laravel, unless you require the events package and boot the events. This solution will work always.

注意：saving除非您需要事件包并启动事件，否则当您在 laravel 之外使用 eloquent 时，或任何其他事件都将不起作用。此解决方案将始终有效。

class Page extends Eloquent {

   public function save(array $options = [])
   {
      // before save code 
      $result = parent::save($options); // returns boolean
      // after save code
      return $result; // do not ignore it eloquent calculates this value and returns this, not just to ignore

   }
}

So now when you save a Page object its save()function get called which includes the parent::save()function;

所以现在当你保存一个 Page 对象时，它的save()函数被调用，其中包含该parent::save()函数；

$page = new Page;
$page->title = 'My Title';
if($page->save()){
  echo 'Page saved';
}

afarazit* I tried to edit his answer but didn't work

afarazit* 我试图编辑他的答案，但没有奏效

回答by Deinumite

If you want control over the model itself, you can override the save function and put your code before or after __parent::save().

如果您想控制模型本身，您可以覆盖 save 函数并将您的代码放在__parent::save().

Otherwise, there is an event fired by each Eloquent model before it saves itself.

否则，每个 Eloquent 模型都会在保存之前触发一个事件。

There are also two events fired when Eloquent saves a model.

当 Eloquent 保存模型时，还会触发两个事件。

"eloquent.saving: model_name" or "eloquent.saved: model_name".

“eloquent.saving：model_name”或“eloquent.saved：model_name”。

http://laravel.com/docs/events#listening-to-events

http://laravel.com/docs/events#listening-to-events