public function listRecords()
 {
     $start = 0;
     $number = 50;
     if (isset($_POST['rStart'])) {
         $start = $_POST['rStart'];
     }
     if (isset($_POST['rNumber'])) {
         $number = $_POST['rNumber'];
     } else {
         $number = School::rowCount();
     }
     $schools = School::all($start, $number);
     require_once 'views/school/list.php';
 }