public static function getAllChallenges()
{
if (!self::$allFetched) {
$items = query(__CLASS__)->where(array('year' => Year::current()))->sort('name')->selectMultiple();
self::$cache = array();
foreach ($items as $item) {
self::$cache[$item->id] = $item;
}
self::$allFetched = true;
}
return self::$cache;
}
