RouteServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\Facades\Route;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use App\Page;
class RouteServiceProvider extends ServiceProvider
{
    /**
     * This namespace is applied to your controller routes.
     *
     * In addition, it is set as the URL generator's root namespace.
     *
     * @var string
     */
    protected $namespace = 'App\Http\Controllers';

    /**
     * Define your route model bindings, pattern filters, etc.
     *
     * @return void
     */
    public function boot()
    {
        parent::boot(); 
        Route::bind('article_date',function($value,$route){ 
            $parms = $route->parameters();
            $pages = Page::find($parms['id']);
            if(isset($pages)) { return $pages;  }
            return abort(404);
        }); 
    } 
}