public function isInterestedIn($question)
{
$interest = new Interest();
$interest->setQuestion($question);
$interest->setUserId($this->getId());
$interest->save();
}
public function addInterest(Interest $l)
{
$this->collInterests[] = $l;
$l->setQuestion($this);
}
public function executeInterested()
{
$this->question = QuestionPeer::retrieveByPk($this->getRequestParameter('id'));
$this->forward404Unless($this->question);
$user = $this->getUser()->getSubscriber();
$interest = new Interest();
$interest->setQuestion($this->question);
$interest->setUser($user);
$interest->save();
}