當記錄存儲在數據庫中但收到無法訪問的語句時，我正在嘗試執行發送郵件功能public function store(Request $request)    {        $visit = Visit::create($request->all());        return response()->json($visit);        $this->sendEmail($request);    }這是發送電子郵件功能public function sendEmail(Request $request){        $visit = Visit::create($request->all());        $host_email = Db::table('users')            ->where('name', '=', $visit->visitor_host)            ->value('email');        $to_name =  $request->input('visitor_name');        $data = array('name'=> $to_name, "body" => "Test mail");        Mail::send('mails.mail', $data, function($message) {            $message->from('[email protected]','cytonn');            $message->to('[email protected]');            $message->subject('Visitor coming notification');        });    }