Event listener to prevent empty spaces in sortable list

AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Contracts\Filesystem\Filesystem;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\Event;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Event::listen('eloquent.deleted:*', function ($model) {
            $reflector = new \ReflectionClass($model);
            $traits = $reflector->getTraitNames();
            if(in_array('Rutorika\Sortable\SortableTrait', $traits)){
                $namespace = $reflector->getName();
                $position_field = $namespace::getSortableField();
                $model->next()->decrement($position_field);
            }
            return true;
        });
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
    }
}