public function redirect()
{
$follow = Follow::getOrFail(Param::get('id'));
$thread = Thread::get($follow->thread_id);
$last_comment_id = Comment::getLastIdInThread($thread);
$follow->last_comment = $last_comment_id;
$follow->update();
redirect(VIEW_THREAD_URL, array('id' => $thread->id, 'page' => ThreadController::LAST_PAGE));
}