How does \Magento\Sales\Model\Order\Shipment::getTracks() work?

dmitry_fedyuk · April 26, 2016, 8:15pm

Context: How does \Magento\Sales\Model\ResourceModel\Order\Shipment\Relation::processRelation() work?

magento/magento2/blob/958164/app/code/Magento/Sales/Model/Order/Shipment.php#L561-L578


/**
 * Returns tracks
 *
 * @return \Magento\Sales\Api\Data\ShipmentTrackInterface[]
 */
public function getTracks()
{
    if ($this->getData(ShipmentInterface::TRACKS) === null) {
        $collection =  $this->_trackCollectionFactory->create()->setShipmentFilter($this->getId());
        if ($this->getId()) {
            foreach ($collection as $item) {
                $item->setShipment($this);
            }
            $this->setData(ShipmentInterface::TRACKS, $collection->getItems());
        }
    }
    return $this->getData(ShipmentInterface::TRACKS);
}