posts_controller.php

class PostsController extends AppController {
        var $name = 'Posts';

        function random() {
                $random = $this->Post->find('first',array(
                        'conditions' => array(
                                'Post.active'=>1,
                        ),
                        'order' => 'rand()',
                ));
                $this->view($random['Post']['id']);
                $this->render('view');
        }
}