public function toOptionHash()
 {
     $role = Mage::getSingleton('aitpermissions/role');
     if ($role->isPermissionsEnabled()) {
         $this->addFieldToFilter('website_id', array('in' => $role->getAllowedWebsiteIds()));
     }
     return parent::toOptionHash();
 }
 /**
  * Limit websites collection
  *
  * @param Mage_Core_Model_Mysql4_Website_Collection $collection
  */
 public function limitWebsites($collection)
 {
     $collection->addIdFilter(array_merge($this->_role->getRelevantWebsiteIds(), array(0)));
     $collection->addFilterByGroupIds(array_merge($this->_role->getStoreGroupIds(), array(0)));
 }