public function indexAction()
{
$request = $this->getRequest();
$page = $request->getParam('page', 1);
$sort = $request->getParam('sort', 'id');
$order = $request->getParam('order', 'asc');
$announcementModel = new Announcement();
$select = $announcementModel->select()->where('ghost = false');
$select->order($sort . ' ' . $order);
$paginator = new Base_Paginator(new Zend_Paginator_Adapter_DbTableSelect($select));
$paginator->setCurrentPageNumber($page);
$this->view->paginator = $paginator;
$this->view->headers = array('created_at', 'title', 'created_by', 'valid_since', 'valid_until', 'id_branch');
}