withX（）在Laravel 4.2中不起作用

Question

The problem is that withErrors() is working perfectly in this code, but withMessage() isn't.

I also tried with('message', 'Test message!'). In views file, I can retrieve withErrors using $errors variable, but if I want to retrieve withMessage, I have to use Session::get('message'). Why is $message not working?

Controller:

public function registration() {
    $rules = array(...);
    $validator = Validator::make(Input::all(), $rules);

    if($validator->fails()) {
        return Redirect::route('registration')->withErrors($validator);
    }
    else {
        //Some code here...

        return Redirect::route('registration')->withMessage('Test message!');
    }
}

Template:

@extends('default.base')

@section('main')
    @if(!empty($errors->all()))
        <div class="alert alert-danger" role="alert">
            <ul>
                @foreach($errors->all() as $error)
                    <li>{{ $error }}
                @endforeach
            </ul>
        </div>
    @endif


    @if(isset($message))
    {{ $message }}
    @endif
@stop

Answer 1

That is because errors is a special case. When creating a view, Laravel check's if there is a session variable with the name errors. If so it will then pass the contents as $errors to the view.

Illuminate\View\ViewServiceProvider@registerSessionBinder

if ($me->sessionHasErrors($app))
{
    $errors = $app['session.store']->get('errors');

    $app['view']->share('errors', $errors);
}

This means you either use Session::has('message') and Session::get('message') in your view or you add a View Composer that does basically the same that Laravel does with errors:

View::composer('*', function($view){
    if(Session::has('message')){
        $view->with('message', Session::get('message'));
    }
});