custom “sales_order_item” attribute to API response

Question

I followed this guide to add a custom product attribute to quote and sales order item throughout the order process and this works fine.

My custom attribute is added to the sales_order_item table correctly but will not return in the order api call: /rest/V1/orders/X . The item in the order are present but the custom added attribute seems to be missing.

How do I add this sales_order_item attribute to the API output?

I tried it by adding a "extension_attributes.xml" to my custom module (that included the custom attribute: see earlier mentioned link) but that seems to have no effect:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Sales\Api\Data\OrderItemInterface">
        <attribute code="deliverycode" type="string" />
    </extension_attributes>
</config>

Thanks for the help!

Update

Still haven't resolved the issues after trying some minor things. I ran into this topic, which is closely related to my issue. I am trying to adjust the code to suit my needs but I haven't found the answer yet after a few hours of trying to switch the code the be suitable for "sales_order_item". If anyone has any solutions or tips to push me in the right direction they are very much appreciated!

Answer 1

Hi,

Please try to get the order item rest/V1/orders/items/(orderid)

Or else add extension attributes in order api

1. create Vendor\Module\etc\extension_attributes.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
<extension_attributes for="Magento\Sales\Api\Data\OrderInterface">
    <attribute code="order_attribute" type="string" />
</extension_attributes>
</config>

Then create observer for event ‘sales_order_load_after’

2. Vendor\Module\etc\events.xml
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="sales_order_load_after">
    <observer name="sales_order_load_order_attribute" instance="Vendor\Module\Observer\Sales\OrderLoadAfter" />
</event>
</config>

Create a file to get the event data

3. vendor\Module\Observer\Sales\OrderLoadAfter.php

<?php
namespace Vendor\Module\Observer\Sales;
use Magento\Framework\Event\ObserverInterface;
class OrderLoadAfter implements ObserverInterface
{
public function execute(\Magento\Framework\Event\Observer $observer)
{
    $order = $observer->getOrder();
    $extensionAttributes = $order->getExtensionAttributes();
    if ($extensionAttributes === null) {
        $extensionAttributes = $this->getOrderExtensionDependency();
    }
    $attr = `Get the order item attributes`
    $extensionAttributes->setOrderAttribute($attr);
    $order->setExtensionAttributes($extensionAttributes);
}
private function getOrderExtensionDependency()
{
    $orderExtension = \Magento\Framework\App\ObjectManager::getInstance()->get(
        '\Magento\Sales\Api\Data\OrderExtension'
    );
    return $orderExtension;
}
}

Please run the upgrade, compile and deploy command

THanks

Answer 2

Let's imagine that you are implementing this for the order service. Then, you request the following service to get a single order:

rest/V1/orders/:orderId

In fact you are requesting the get method of OrderRepository.

So in your extension_attributes.xml you already have this:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Sales\Api\Data\OrderItemInterface">
        <attribute code="deliverycode" type="string" />
    </extension_attributes>
</config>

After doing that you need to implement you Plugin for the OrderRepository, where in your implementation you should follow the example down below:

<?php

namespace YourVendor\Sales\Plugin\Model;

class OrderRepository
{

    protected $orderItemExtension;

    public function __construct(
        \Magento\Sales\Api\Data\OrderItemExtensionInterfaceFactory $orderItemExtension
    )
    {
        $this->orderItemExtension = $orderItemExtension;
    }

    public function afterGet(
        \Magento\Sales\Model\OrderRepository $subject,
        $result
    )
    {
        foreach ($result->getItems() as $item) {
            $deliveryCode = ""; // whatever it comes from...

            $extensionAttributes = $this->orderItemExtension->create();
            $extensionAttributes->setData('deliverycode', $deliveryCode );
            $item->setExtensionAttributes($extensionAttributes);
        }

        return $result;
    }
}

I hope it helps!