Resource Registrar, add a parameter to show routes

AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind(
            \Illuminate\Routing\ResourceRegistrar::class,
            \App\Lib\ResourceRegistrar::class
        );
    }
}

ResourceRegistrar.php

<?php

namespace App\Lib;

use Illuminate\Routing\ResourceRegistrar as BaseRegistrar;

class ResourceRegistrar extends BaseRegistrar
{
    // force it to define edit before show to avoid conflicting routes
    protected $resourceDefaults = ['index', 'create', 'store', 'edit', 'show', 'update', 'destroy'];
    
    public function addResourceShow($name, $base, $controller, $options)
    {
        $uri = $this->getResourceUri($name). '/{'. $base .'}';
        
        if (isset($options['slug']) && $options['slug']) {
            $uri .= '/{slug}';
        }
        
        $action = $this->getResourceAction($name, $controller, 'show', $options);
        
        return $this->router->get($uri, $action);
    }
}