datatable.directory/app/Http/Controllers/Controller.php

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Http\Request;
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 {
        ValidatesRequests::validate as validate_orig;
        ValidatesRequests::validateWithBag as validateWithBag_orig;
    }

    // Hacks to allow recursive nesting of validations in string and array format

    public function makeValidator($data, $rules, $messages = array(), $customAttributes = array())
    {
        return \Validator::make($data, vali($rules), $messages, $customAttributes);
    }

    public function validate(Request $request, array $rules,
                             array $messages = [], array $customAttributes = [])
    {
        return objBag($this->validate_orig($request, vali($rules), $messages, $customAttributes));
    }

    public function validateWithBag($errorBag, Request $request, array $rules,
                                    array $messages = [], array $customAttributes = [])
    {
        return objBag($this->validateWithBag_orig($errorBag, $request, vali($rules),
            $messages, $customAttributes));
    }

    protected function backWithErrors($errors)
    {
        return back()->withInput()->withErrors($errors);
    }
}