root/trunk/apps/snippets/lib/myUser.class.php

<?php

class myUser extends sfBasicSecurityUser
{
  public function signIn($user)
  {
    $this->setAttribute('user_id', $user->getId(), 'user');
    $this->setAttribute('login', $user->getlogin(), 'user');
    $this->setAttribute('name', $user->__toString(), 'user');

    $this->setAuthenticated(true);

    $this->addCredential('user');

    if ($user->getIsAdmin())
    {
      $this->addCredential('admin');
    }
  }

  public function signOut()
  {
    $this->getAttributeHolder()->removeNamespace('user');

    $this->setAuthenticated(false);
    $this->clearCredentials();
  }

  public function getUserLogin()
  {
    return $this->getAttribute('login', false, 'user');
  }

  public function getUserName()
  {
    return $this->getAttribute('name', false, 'user');
  }

  public function getUserId()
  {
    return $this->getAttribute('user_id', false, 'user');
  }

  public function canVoteFor($snippet)
  {
    // only authenticated users can vote
    if(!$this->isAuthenticated())
    {
      return false;
    }

    $user_id = $this->getUserId();

    // you can't vote for your own questions
    if ($snippet->getSnippetUser()->getId() == $user_id)
    {
      return false; 
    }

    // you can vote only once
    $c = new Criteria();
    $c->add(SnippetVotePeer::USER_ID, $user_id) ;
    $c->add(SnippetVotePeer::SNIPPET_ID, $snippet->getId());
    $vote = SnippetVotePeer::doSelectOne($c);

    return ($vote) ? false : true;
  }
}

?>