Magento - can't save changed customer GroupId with observer for newsletter_subscriber_save_before event -

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i built observer newsletter_subscriber_save_before event; gets fired when customer subscribes/unsubscribes newsletters. need change customers groupid accordingly. seems can change groupid, can't manage save it. if call in code $customer->save() - method, run infinite loop; same occurs if try hook newsletter_subscriber_save_after event.

anyone can me? appreciated!

here's code in observer.php :

public function newsletter_subscriber_change($observer) {     try {          // status of subscriber         $subscriber = $observer->getevent()->getsubscriber();          $status = $subscriber->getstatus();         $email = $subscriber->getemail();          $customer = mage::getsingleton('customer/customer');         $customer->setwebsiteid(mage::app()->getwebsite()->getid());          $customer->loadbyemail($email);      // here change groupid         $customer->setdata( 'group_id', 9 );     // if check group here, change applied ...         $customer_group = $customer->getgroupid();          // tried saving following, run loop         $customer->save();       } catch (exception $e) {         mage::log("newsletter_subscriber_change observer failed: " . $e->getmessage());     } }

you got infinite loop because mage_newsletter capture customer_save_after event save subscribe data. can update group id raw query bellow: 

public function newsletter_subscriber_change($observer) {     try {          // status of subscriber         $subscriber = $observer->getevent()->getsubscriber();          $status = $subscriber->getstatus();         $email = $subscriber->getemail();          $customer = mage::getsingleton('customer/customer');         $customer->setwebsiteid(mage::app()->getwebsite()->getid());          $customer->loadbyemail($email);          $adapter = mage::getsingleton('core/resource');          /* @var $conn varien_db_adapter_interface */         $conn = $adapter->getconnection('core_write');          $update = 'update ' . $customer->getresource()->gettable('customer/customer_enity')                 . ' set group_id = ? entity_id = ?';          $conn->query($update, array(9, $customer->getid()));      } catch (exception $e) {         mage::log("newsletter_subscriber_change observer failed: " . $e->getmessage());     } }

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