gistfile1.php

<?php

class Application_Model_Posts
{
    public function getPosts()
    {
        $posts = new Application_Model_DbTable_Posts();
        $select = $posts->select()->order('created_at DESC')
                                  ->order('id DESC');
        return $posts->fetchAll($select);
    }
}


class IndexController extends Zend_Controller_Action
{

    ...

    public function indexAction()
    {
        // Создаем экземпляр модели постов
        $posts = new Application_Model_Posts();
        
        // Выполняем запрос
        $this->view->posts = $posts->getPosts();
    }

    ...

}