protected function post_comment($r)
{
Input::ensureRequest($r, array("id"));
$id = $r["id"];
$posts = $this->jsonPost();
Input::ensureRequest($posts, array("username", "mail", "content"));
$comments = new CommentsModel();
$comment = $comments->newRow();
$comment->set(CommentsModel::POST_ID, $id);
$comment->set(CommentsModel::USERNAME, $posts["username"]);
$comment->set(CommentsModel::MAIL, $posts["mail"]);
$comment->set(CommentsModel::CONTENT, $posts["content"]);
$comment->save();
$ret = $comment->getValues();
$ret["gid"] = md5($ret[CommentsModel::MAIL]);
unset($ret[CommentsModel::ID]);
unset($ret[CommentsModel::POST_ID]);
unset($ret[CommentsModel::MAIL]);
Output::success($ret);
}