<?php namespace Modules\Menu\Database\Models;
   
use Illuminate\Database\Eloquent\Model;

class Menu extends Model {

	public $table = 'menu';

	public $timestamps = false;

    protected $fillable = ["text","link","position","parent_id","depth","left","right","public"];

}
<?php namespace Modules\Menu\Database\Models;
   
use Illuminate\Database\Eloquent\Model;

class Menu extends Model {

	public $table = 'menu';

	public $timestamps = false;

	protected $fillable = ["text","link","position","parent_id","depth","left","right","public"];
    
	public function children()
	{
		return $this->whereParentId($this->id)->orderBy('position')->get();
	}

	public static function hierarchy($parent_id = 0)
	{
		$items = self::whereParent_id($parent_id)->orderBy('position')->get();

		foreach($items as $item)
		{
			$item->items = self::hierarchy($item->id);
		}

		return $items;
	}

}

Add usefull methods for working with childrens of menu
Add usefull methods for working with childrens of menu