Session::flash is not working in Laravel version 5.2.27 - forms

Question

I am trying to display a success message upon form submit in Laravel.
However, it doesn't work.
I've added use Session; at the top of the controller file, the routes are in the middleware and the configuration in config/session.php is the default one.
My controller function is able to save in the database without any problem :
public function store(Request $request)
{
$post = new Post;
$post->title = $request->title;
$post->description = $request->description;
$post->slug = $request->slug;
$post->body = $request->body;
$post->save();
Session::flash('success', 'SUCCESS MESSAGE GOES HERE');
return redirect()->route('posts.show', $post->id);
}
here is my template file :
#if(Session::has('success'))
<div class="alert-box success">
<h2>{{ Session::get('success') }}</h2>
</div>
#endif
My routes :
Route::group(['middleware' => ['web']], function() {
Route::get('/', 'PagesController#getIndex');
Route::resource('posts','PostController');
});
Is see there is no success in the session file. I cannot figure out why exactly :
a:4:{s:6:"_token";s:40:"EntXIr9tkqAcKarDZhaNxKb6RfcFdFV9ZtF6W7kU";s:9:"_previous";a:1:{s:3:"url";s:30:"http://localhost:8000/posts/35";}s:5:"flash";a:2:{s:3:"old";a:0:{}s:3:"new";a:0:{}}s:9:"_sf2_meta";a:3:{s:1:"u";i:1459467699;s:1:"c";i:1459467699;s:1:"l";s:1:"0";}}
Someone can help me figure out what the problem is?

Answer 1

The web middleware no longer needs to be explicitly applied to routes in your routes.php file. It is now silently applied to routes within app/Providers/RouteServiceProvider.php, as per this change in Laravel 5.2.27
Previously you would be required to explicitly apply the web middleware to routes like so:
Route::group(['middleware' => ['web']], function () {
Route::get('/', function () {
return view('welcome');
});
});
The above can now be achieved like so:
Route::get('/', function () {
return view('welcome');
});

Answer 2

Make sure the route is using the "web" middleware to access session data.
Route::group(['middleware' => 'web'], function () {
Route::get('foo', 'FooController#bar'); // session data should be available here
});