class RatihAnggaranORM extends ORM_Model
{
 public static function fSumber_dana($orm, $sumber_dana_id = false)
    {
        return ($sumber_dana_id) ?  $orm->where('sumber_dana_id', $sumber_dana_id) : $orm;
    }
    public static function fStatus($orm, $status = false)
    {
        return ($status) ?  $orm->where('status', $status) : $orm;
    }
    /** END Filter **/


   public  static function bySumberDana($sumber_dana_id = false)
    {
        return self::filter('fSumber_dana', $sumber_dana_id);
    }

    public static  function byStatus($status = false)
    {
        return self::filter('fStatus', $status);
    }

      //this will return ERROR that second chaining is not available. 
	$query = RatihAnggaranORM::byStatus()->bySumberDana();
	var_dump($query);