public static function handleClassesRequest()
 {
     // discover activerecord classes
     $recordClasses = array();
     foreach (Emergence_FS::findFiles('\\.php$', true, 'php-classes') as $classNode) {
         if ($classNode->Type != 'application/php') {
             continue;
         }
         $classPath = $classNode->getFullPath(null, false);
         array_shift($classPath);
         $className = preg_replace('/(\\.class)?\\.php$/i', '', join('\\', $classPath));
         foreach (static::$classFilters as $pattern) {
             if (preg_match($pattern, $className)) {
                 continue 2;
             }
         }
         if (is_subclass_of($className, 'ActiveRecord') && !in_array($className, $recordClasses)) {
             $recordClasses[] = $className;
         }
     }
     natsort($recordClasses);
     return static::respond('classes', array('classes' => $recordClasses));
 }