public function save(Application_Model_Comment $comment)
{
$data = array('password' => $comment->getPassword(), 'username' => $comment->getUserName());
if (null === ($id = $comment->getId())) {
unset($data['id']);
$this->getDbTable()->insert($data);
} else {
$this->getDbTable()->update($data, array('id = ?' => $id));
}
}