public static function getAllChallengeWinners()
{
Challenge::getAllChallenges();
if (!self::$allFetched) {
$items = query(__CLASS__)->sortDesc('time')->selectMultiple();
self::$cache = array();
foreach ($items as $item) {
if (!$item->getChallenge()) {
continue;
}
self::$cache[$item->id] = $item;
}
self::$allFetched = true;
}
return self::$cache;
}
