验证用户Laravel

大家好，我有一个带有laravel的简单应用程序，我试图在我的应用程序中添加一个用户身份验证，这是我的route.php文件：

Route::model('task', 'Task');

Route::get('/login', 'HomeController@ShowLogin');
Route::post('/login', 'HomeController@doLogin');
Route::get('/logout' , 'HomeController@doLogout');

Route::group(array('before'=>'auth'), function(){
Route::get('/', 'TasksController@home');
Route::get('/create', 'TasksController@create');
Route::get('/edit/{task}', 'TasksController@edit');
Route::post('/edit', 'TasksController@doEdit');
Route::post('/create' , 'TasksController@saveCreate');
Route::get('/delete/{task}' , 'TasksController@delete');
Route::post('/delete', 'TasksController@doDelete');
Route::get('/task/{id}' , 'TasksController@show')->where('id', ''d+');
});

这是我的HomeController.php；

class HomeController extends BaseController {
public function showLogin()
{
    return View::make('login');
}
public function doLogin()
{
    $userdata = array(
        'username' => Input::get('username'),
        'password' => Input::get('password')
    );
    dd(Auth::attempt($userdata));
    if(Auth::attempt($userdata))
    {
        return Redirect::to('/');
    }
    else
    {
        return Redirect::to('login');
    }
}
public function doLogout()
{
    Auth::logout();
    return Redirect::to('login');
}
}

这是我的login.blade.php文件：

@extends('layout')
@section('content')
<section class="header section-padding">
<div class="background">&nbsp;</div>
<div class="container">
    <div class="header-text">
        <h1>Learning Laravel: The Easiest Way</h1>
        <p>
            Showing a single task <br/> using route parameter!
        </p>
    </div>
</div>
</section>
<div class="container">
<section class="section-padding">
    <div class="jumbotron text-center">
        <h1>
            Login
        </h1>
        <P>
            {{ $errors->first('username')  }}
            {{ $errors->first('password') }}
        </P>
        {{ Form::open(['url' => '/login', 'class' => 'form']) }}
        <div class="form-group">
            {{ Form ::label('username', 'Username:') }}
            {{ Form::text('username')}}
        </div>
        <div class="form-group">
            {{ Form::label('password', 'Password:') }}
            {{ Form::password('password') }}
        </div>
        <div class="form-group">
            {{ Form::submit('Login', ['class' => 'btn btn-primary']) }}
        </div>
        {{ Form::close() }}
    </div>
</section>
</div>
@stop

当我输入任何用户名和密码时，我没有得到任何错误，我从未登录，我重定向到登录页面，dd（）总是返回bool（false），任何人都能帮助我吗，并解释更多关于Laravel中身份验证的信息，谢谢U：）

编辑

这是我的模型/User.php，我不添加任何代码：

class User extends Eloquent implements UserInterface, RemindableInterface {
    use UserTrait, RemindableTrait;

    protected $table = 'users';
    protected $hidden = array('password', 'remember_token');
}

我手动创建用户表