Laravel 5.2: withErrors on redirect not working - laravel

Question

I'm currently struggling with a Laravel problem I can't fix myself. If I pass errors using withErrors() the errors are not passed to the Error Bag ($errors).
My Controller (FormController):
public function contact(Request $request) {
$validator = Validator::make($request->all(), [
'name' => 'required',
'email' => 'required|email',
'message' => 'required',
]);
if ($validator->fails()) {
return redirect()->back()->withErrors($validator)->withInput($request->all());
}
return redirect()->back();
}
The thing is, also withInput() is not working. Where could the problem come from? I appreciate your help!
(Part of) the defined routes.php:
Route::group(['middleware' => 'web'], function(){
Route::post('/contact', 'FormController#contact');
});
Session config
return [
'driver' => env('SESSION_DRIVER', 'memcached'),
'lifetime' => 120,
'expire_on_close' => false,
'encrypt' => false,
'files' => storage_path('framework/sessions'),
'connection' => null,
'table' => 'sessions',
'lottery' => [2, 100],
'cookie' => 'session',
'path' => '/',
'domain' => null,
'secure' => false,
];

Answer 1

In Laravel 5.2 you need to use the web middleware in your routes to pass the errors to the view.
Route::group(['middleware' => ['web']], function () {
Route::get('/', function() {
return view('welcome');
});
});

Answer 2

Don't pass anything to the withInput
if ($validator->fails()) {
return redirect()->back()->withErrors($validator)->withInput();
}
and use the old function to get the flashed data
$name = $request->old('name');
or
{{old('name')}}
Hope it helps

Answer 3

If the controller that you are redirecting to is also using withErrors() function, the error messages in redirect()->back()->withErrors($validator) will be overwritten.
But, the old messages are still in session. So you can still read and display them with session('errors'):
#if ($errors->any())
<div class="alert alert-danger">
<ul class="my-0">
#foreach ($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#elseif (null !== session('errors') && session('errors')->any())
<div class="alert alert-danger">
<ul class="my-0">
#foreach (session('errors')->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#endif

Answer 4

This can be due to session problem. To diagnose this problem use print_r($request->session()). if you are getting different id in session object that means session is not setting up properly.
To get it done open Kernel.php
dont specify below line in $middleware array
specify these below line in web middleware group and $middlewarePriority array
\Illuminate\Session\Middleware\StartSession::class,
\Illuminate\View\Middleware\ShareErrorsFromSession::class,