Method [validate] does not exist. - Laravel 5.5 - laravel-5

Question

I'm trying "laravel-modules" and "Laravel-permission package". But when run post, it has issue 'Method [validate] does not exist.'. i have added 'use Validator;' but no thing change. In some topics, i remove "use Illuminate\Routing\Controller;" in PermissionController, but it have error
Controller
namespace App\Http\Controllers;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
class Controller extends BaseController
{
use AuthorizesRequests, DispatchesJobs, ValidatesRequests;
}
My PermissionController
namespace Modules\User\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Routing\Controller;
use Auth;
//Importing laravel-permission models
use Spatie\Permission\Models\Role;
use Spatie\Permission\Models\Permission;
use Session;
class PermissionController extends Controller
{
// use Validator;
public function __construct() {
$this->middleware(['auth', 'isAdmin']); //isAdmin middleware lets only users with a //specific permission permission to access these resources
}
/**
* Display a listing of the resource.
* #return Response
*/
public function index()
{
$permissions = Permission::all(); //Get all permissions
return view('user::permissions/index')->with('permissions', $permissions);
// return view('user::index');
}
/**
* Show the form for creating a new resource.
* #return Response
*/
public function create()
{
$roles = Role::get(); //Get all roles
return view('user::permissions/create')->with('roles', $roles);
}
/**
* Store a newly created resource in storage.
* #param Request $request
* #return Response
*/
public function store(Request $request)
{
$this->validate($request, [
'name'=>'required|max:40',
]);
$name = $request['name'];
$permission = new Permission();
$permission->name = $name;
$roles = $request['roles'];
$permission->save();
if (!empty($request['roles'])) { //If one or more role is selected
foreach ($roles as $role) {
$r = Role::where('id', '=', $role)->firstOrFail(); //Match input role to db record
$permission = Permission::where('name', '=', $name)->first(); //Match input //permission to db record
$r->givePermissionTo($permission);
}
}
return redirect()->route('permissions.index')
->with('flash_message',
'Permission'. $permission->name.' added!');
}
}
Route
Route::group(['middleware' => 'web', 'prefix' => 'permissions', 'namespace' => 'Modules\User\Http\Controllers'], function()
{
Route::get('/', 'PermissionController#index');
Route::get('/create', 'PermissionController#create');
Route::post('/', 'PermissionController#store');
Route::delete('/', ["as" => "permissions.destroy", "uses" => "PermissionController#destroy"]);
});

Answer 1

Add back in use Validator in your PermissionController. Add this right after use Auth;. You have currently added this in the wrong place.
Then change your $this->validate(...) code to:
// validate the input
$validation = Validator::make( $request->all(), [
'name'=>'required|max:40',
]);
// redirect on validation error
if ( $validation->fails() ) {
// change below as required
return \Redirect::back()->withInput()->withErrors( $validation->messages() );
}

Answer 2

I was trying
$this->validate($request, [
'password' => 'required|confirmed|min:6',
]);
But in Laravel 5.7 following code did the trick for me
$request->validate([
'password' => 'required|confirmed|min:6',
]);