How to get the shipment number of an order item?

Question

Once an order is placed, I programmatically generate associated shipments (because of different manufacturing time on my products)

I can then have for a single order several associated shipments:

ex:

• Shipment #100000110 in 2 days for items 1 and 2
• Shipment #100000111 in 5 days for item 3

I would like to access the shipment number associated to specific item :

something like :

$order = Mage::getModel('sales/order')->load($_order_id);
$_items = $order->getAllItems();

foreach ($_items as $_item)
{
    $ciid = $_item->getId();
    $shipmentNbr = $_item->getShipment()->getIncrementId();
    ...
}

Thank your for your help,

Answer 1

If you have the $orderItem, you can easily get all the ShipmentItems:

$shipmentItems = Mage::getResourceModel('sales/order_shipment_item_collection')
    ->addFieldToFilter('order_item_id', $orderItem->getId());
foreach ($shipmentItems as $shipment_item) {
     if ($shipment_id = $shipment_item->getParentId()) {
        $shipment = Mage::getModel('sales/order_shipment')->load($shipment_id);
     }
}

if this doesn't work, you need to load the shipment based on the $item->getParentId()