Dynamic pages with slugs for CakePHP 2.x

PageSlugRoute.php

<?php
// app/Lib/Routing/Route/PageSlugRoute.php
// 
App::uses('Page', 'Model');
App::uses('CakeRoute', 'Routing/Route');
class PageSlugRoute extends CakeRoute {

  public function parse($url) {
    $params = parent::parse($url);
    if (empty($params)) return false;
    
    /* Get slugs for dynamic "static" pages. These are used to create the
     * routes, as well as in the controller, to set caching.
     */
    $slugs = Cache::read('Page.slugs');

    if (empty($slugs)) {
      App::uses('Page', 'Model');
      $Page = new Page();
      $slugs = $Page->getSlugs();
    }
    //debug($slugs);
    
    if (isset($slugs[$params['slug']])) {
      $params['pass'][] = $params['slug'];
      return $params;
    }
    return false;    
  }
}


// app/Config/routes.php

App::uses('PageSlugRoute', 'Lib/Routing/Route');

// add routes directly for any non-dynamic pages
Router::connect(
  '/',
  [
    'controller' => 'pages',
    'action'     => 'display',
    'slug'       => 'about'
  ),
  [
    'slug' => 'about',
    'pass' => ['slug')
  )
);


Router::connect(
  '/admin/pages/edit/:id',
  [
    'admin'      => 1,
    'controller' => 'pages',
    'action'     => 'edit'
  ],
  [
    'id'   => '[0-9]+',
    'pass' => ['id']
  ]
);
Router::connect(
  '/admin/pages/add/:parent_id',
  [
    'admin'      => 1,
    'controller' => 'pages',
    'action'     => 'add'
  ],
  [
    'parent_id' => '[0-9]+',
    'pass'      => ['parent_id']
  ]
);
Router::connect(
  '/admin/pages/delete/:id',
  [
    'admin'      => 1,
    'controller' => 'pages',
    'action'     => 'delete'
  ],
  [
    'id'   => '[0-9]+',
    'pass' => ['id']
  ]
);

// dynamic routes
Router::connect(
  '/:slug',
  [
    'admin'      => 0,
    'controller' => 'pages',
    'action'     => 'display'
  ],
  [
    'slug'       => '[-0-9a-z]+',
    'pass'       => ['slug'],
    'routeClass' => 'PageSlugRoute'
  ]
);

CakePlugin::routes();
require CAKE . 'Config' . DS . 'routes.php';