public static function getMembershipsOfUserObjects($user_id)
 {
     $classes = self::getMembershipsOfUser($user_id);
     $object_array = array();
     foreach ($classes as $class) {
         $temp = array('id' => $class['class_id'], 'name' => $class['name']);
         $obj = Classes::instantiate($temp);
         array_push($object_array, $obj);
     }
     return $object_array;
 }