public function getOldInput($key)
    {
        $this->input = $this->request->hasOldInput() !== false ? $this->request->oldInput() : array();

        // Input that is flashed to the flash can be easily retrieved by the
        // developer, making repopulating old forms and the like much more
        // convenient, since the request's previous input is available.
        return array_get($this->input, $this->transformKey($key), null);
    }