public function save(Application_Model_Comments $comments)
 {
     $data = array('user_name' => $comments->getUsername(), 'description' => $comments->getDescription(), 'date_created' => date('Y-m-d H:i:s'));
     if (null === ($id = $comments->getId())) {
         unset($data['id']);
         $this->getDbTable()->insert($data);
     } else {
         $this->getDbTable()->update($data, array('id = ?' => $id));
     }
 }