Auth::user(） 即使用户已登录，也会返回 Null

这里存储新注册用户的方法数据保存在数据库中，然后新用户登录。

在存储方法内进行用户身份验证后，控制器将触发 show 方法，在 show 方法内 dd（Auth：：user（）） 返回 null null。我的路由和控制器位于路由中间件组中。这意味着我没有登录用户。

我该如何解决这个问题？

public function store(Request $request)
{
    //
    $data = $request->all();
    print_r($data);
    $rules = array(
       'username'  => 'unique:users,username|required|alpha_num',
       'password'  => 'required|alpha_num',
       'full_name' => 'required',
       'email'     => 'required|unique:users,email'
    );
    // Create a new validator instance.
    $validator = Validator::make($data, $rules);
    if ($validator->fails()) {
        $errors = $validator->messages();
        return Redirect::route('user.create')->withErrors($validator);
    } else {
        $user = new User();
        $user->username = $request->username;
        $user->password = Hash::make($request->password);
        $user->full_name = $request->full_name;
        $user->email = $request->email;
        $user->joined = date('d-m-y H-i-s');
        $user->save();

        if(Auth::attempt(['username' => $request['username'],'password' => $request['password']])){
            return redirect()->route('user.show',[$request['username']]);
        }
    }
}
public function show($user)
{
    $indicator = is_numeric($user)?'user_id':'username';
    $info=User::where($indicator,'=',$user)->get()->first();
    if($info){
       dd(Auth::user());  // returns null
       $data = array('info' => $info);
       return View::make('user.show')->with('info',$data);
    }else{
         echo "this user doesn't exist";
         $info = User::where($indicator,'=', Auth::user()->$indicator)->first();
         $data = array('info' => $info);
         return View::make('user.show')->with('info',$data);
    }
}

我的用户模型：

namespace App;
use Illuminate'Database'Eloquent'Model;
use Illuminate'Contracts'Auth'Authenticatable;
class User extends Model implements Authenticatable
{
    use 'Illuminate'Auth'Authenticatable;
    protected $table = 'users';
    public $timestamps = false;
}