foreach ($depatrments as $d) {
     $manager_count = ORM::factory('manager')
             ->where('department_id','=',$d->id)
             ->count_all()
             ;

          $depatrment_table[]=array(
                        'depatrment_name'=>$d->name,
                        'depatrment_mail'=>$d->mail,
                        'depatrment_phone'=>$d->phone,
                        'manager_count'=>$manager_count,

            );
        }