Laravel Redirect to Query String

AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Arr;
use Illuminate\Routing\Redirector;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        /**
         * Create a new redirect response to the given queries.
         *
         * @param  array  $queries
         * @param  bool  $merge
         * @param  int  $status
         * @param  array  $headers
         * @param  bool  $secure
         * @return \Illuminate\Http\RedirectResponse
         */
        Redirector::macro('toQuery', function ($queries, $merge = true, $status = 302, $headers = [], $secure = null) {
            $request = $this->generator->getRequest();

            $queries = Arr::query($merge ? array_merge($request->query(), $queries) : $queries);

            return $this->to($request->url().'?'.$queries, $status, $headers, $secure);
        });
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

HomeController.php

<?php

namespace App\Http\Controllers;

class HomeController extends Controller
{
    /**
     * Display the listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        return redirect()->toQuery(['slug' => 'Post'], false);
    }
}