public function editAction()
 {
     $id = (int) isset($_GET['id']) ? $_GET['id'] : 0;
     $this->conf_caja = conf_caja::get($id);
     $this->page->extra_url = '&action=edit&id=' . (int) $this->conf_caja->getId();
     $this->action = 'edit';
     $this->template = 'admin_cajas/form';
     if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $this->conf_caja->setValues($_POST);
         $this->conf_caja->setEdit(true);
         if ($this->conf_caja->save()) {
             $this->new_message("Configuracion de caja actualizada correctamente!");
             $this->indexAction();
         } else {
             $this->new_error_msg("¡Imposible actualizar configuracion de caja!");
         }
     }
 }