public function comment($title, $content, User $user)
{
$c = parent::comment($title, $content, $user);
// generate activity
$info = array('user' => $user, 'action' => 'comment', 'object' => $this, 'link' => $c);
$act = Activity::create($info);
// inform all stack holders
$users = Sdb::fetch('user', Comment::table(), array('teacher=?' => array($this->id)));
$info = array('activity' => $act);
foreach ($users as $u) {
$info['user'] = $u;
Timeline::create($info);
}
}
