dongxixia6399 2017-12-14 06:57
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如何在Laravel 5.5中实现事件

The Laravel Eloquent Event docs give this example:

namespace App;

use App\Events\UserSaved;
use App\Events\UserDeleted;
use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The event map for the model.
     *
     * @var array
     */
    protected $dispatchesEvents = [
        'saved' => UserSaved::class,
        'deleted' => UserDeleted::class,
    ];
}

I simply want to know what would go in a UserSaved::class to, let's say, add a hash id on the initial save. The docs are frustratingly opaque at this point!

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  • dousao2186 2017-12-14 07:12
    关注

    In any of your model event classes, just do this:

    For example: App\Events\UserSaved.php

    <?php
    
    namespace App\Events;
    
    use Illuminate\Queue\SerializesModels;
    
    class UserSaved
    {
    
        use SerializesModels;
    
        /**
         * @var \App\User
         */
        public $user;
    
        public function __construct($user)
        {
            // All dispatched model events will receive an instance
            // of the model itself. Usually, we'll just assign
            // it as a property of this event class
            $this->user = $user;
        }
    }
    

    Dispatched event are supplied with the model instance, as shown in the source code:

    Documentation: Defining Events

    So at the later time when your listeners caught this event, they will have an instance of this UserSaved object, and you can just access user from $userSaved->user.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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