public static function refund($accountId, $refundInfo)
{
$refund = new self();
$refundNumber = StringUtil::getUniqueCode('refund', 'T');
$refund->transactionId = empty($refundInfo['transactionId']) ? '' : $refundInfo['transactionId'];
$refund->refundNumber = $refundNumber;
$refund->accountId = $accountId;
$refund->orderNumber = $refundInfo['orderNumber'];
$refund->expectedAmount = $refundInfo['expectedAmount'];
$refund->realAmount = $refundInfo['realAmount'];
$refund->admin = $refundInfo['admin'];
$refund->user = $refundInfo['user'];
$refund->refundMode = $refundInfo['refundMode'];
$refund->refundAt = empty($refundInfo['refundAt']) ? new MongoDate() : new MongoDate(TimeUtil::ms2sTime($refundInfo['refundAt']));
$comments = empty($refundInfo['comments']) ? '' : $refundInfo['comments'];
$refund->comments = $comments;
$refund->subject = $refundInfo['subject'];
return $refund->Save();
}