Laravel4 使用 Redis 出現 Call to undefined method Redis::connection() 錯誤

以下次錯誤訊息:


Symfony \ Component \ Debug \ Exception \ FatalErrorException
Call to undefined method Redis::connection()

本來的連線方式是:
$redis = Redis::connection();

後來改用:
$app = app();
$redis = $app['redis']->connection();

參考:
stackoverflow Laravel 4 : Call to undefined method Redis::connection()