Laravel身份验证不适用于特定用户

Question

我有一个非常适合每个移动用户登录的代码，直到用户尝试登录，但他不能在这里输入登录代码， 请注意，这仅发生在该用户上

public function MobileLogin(Request $request)
{
    error_log($request);

    $n = $request->get('username');
    $p = $request->get('password');

    error_log($p);
    error_log($n);
    error_log('i got the values');

    if (Auth::attempt( array(
            'UserName' => $request->get('username'),
            'password' => $request->get('password')
        ) )) {
        $user = Auth::user();
        $id = Auth::id();
        error_log($id); // i am able to see this value on the log which means user is authenticated

        $n = 'ok';

        return Response::json($user); // but i couldn't get this instead
    } else {
        $n ='Invalid Username or Password Please Try Again'; // i get this

        return Response::json($n);
    }
}