In-Model Event Observers for Laravel Models.

RegisterInModelEvents.php

<?php

namespace App\Models\Traits;

use Illuminate\Support\Str;

trait RegisterInModelEvents
{
    /**
     * Register in-model event observers. This is to avoid creating a seperate
     * observer file for a single event. Will match any method matching the
     * `on[ObservableEvent]` and register it as a listener on the event.
     *
     * For example, onCreating(); onCreated(); onUpdating(); onUpdated();
     * onDeleting(); onDeleted(); onSaving(); onSaved(); onRestoring();
     * onRestored(); etc. It also supports added observable events.
     *
     * @return void
     */
    protected static function bootRegisterInModelEvents()
    {
        $instance = new static;

        foreach ($instance->getObservableEvents() as $event) {
            $method = 'on'.Str::ucfirst($event);
            if (method_exists($instance, $method)) {
                static::registerModelEvent($event, static::class.'@'.$method);
            }
        }
    }
}