Update Item Product Options After Order Placed - magento

Question

I'm working on an observer that needs to add (a) serial key(s) to each item in the cart once an order is placed.
I'm listening to the event sales_model_service_quote_submit_success right now.
I've been able to access the order, get a list of the items, iterate through them, and get the product options. My code fails either when I try to setProductOptions or save--I'm not sure which, maybe it's both.
Here is the relevant code:
// Get access to order information
$lastOrderId = Mage::getSingleton('checkout/session')->getLastOrderId();
$order = Mage::getModel('sales/order')->load($lastOrderId);
// Get the items from the order
$items = $order->getAllItems();
foreach ($items as $item)
{
// Pretend here is the call that fetches the serial keys for this item and stores them in $keyString
// If we actually received the keys in a string, store them with the item
if (!empty($keyString))
{
$productOptions = array();
if (count($item->getProductOptions()))
{
$productOptions = $item->getProductOptions();
}
$productOptions['keys'] = $keyString;
$item->setProductOptions($productOptions);
$item->save();
}
}
Any ideas what I have forgotten or done wrong? Thanks a bunch.

Answer 1

no such observer , at least i didn't find it from codebase, here's what you can use
Mage::dispatchEvent('sales_model_service_quote_submit_before', array('order'=>$order, 'quote'=>$quote));
Mage::dispatchEvent('sales_model_service_quote_submit_after', array('order'=>$order, 'quote'=>$quote));
and in your observer method
/**
*
* #param Varien_Event_Observer $observer
*
*/
public function setShippingDefaults(Varien_Event_Observer $observer) {
$order = $observer->getEvent()->getOrder();
}
the idea is that if you do it in before-action then you won't need to call save and if you do it in after-action then you do and if you do it in before action you might just end in endless loop if you are not careful.