hacer automáticamente creating_by y actualizado_by laravel

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Facades\Auth;

class Flight extends Model {

    use SoftDeletes;
    use Notifiable;

    /**
     * Table name
     * @var variable
     */
    public $table = 'flight';

     /**
     * For Soft delete
     * @var array
     */
    protected $dates = ['deleted_at'];

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

        static::creating(function ($model) {
            $model->created_by = is_object(Auth::guard(config('app.guards.web'))->user()) ? Auth::guard(config('app.guards.web'))->user()->id : 1;
            $model->updated_by = NULL;
        });

        static::updating(function ($model) {
            $model->updated_by = is_object(Auth::guard(config('app.guards.web'))->user()) ? Auth::guard(config('app.guards.web'))->user()->id : 1;
        });
    }
}
Irfan