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How to add custom attribute in address for rest api to set and get for view that attribute in magento 2.1.12 ?

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Step 1:

Create a new column and set value for the existing order Firstly, you need to create a new column in table sales_order and name for it set a value for the existing orders. In this post, we named it “tip_and_trick_attribute”.

Step 2: Create a specific new Life

Next, you create a file \app\code\Magento\TipandTrick\etc\extension_attributes.xml in the extension folder with following content:

<?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="tip_and_trick_attribute" type="string" />
</extension_attributes>
</config>

You have to create file extension_attributes.xml to add the custom attribute because Magento 2 doesn’t accept to add a new field in the response on the Rest API

Step 3: Create observe

In this step, you need to create observe for event ‘sales_order_load_after’ through the file \app\code\Magento\TipandTrick\etc\events.xml to add the custom attribute into extension_attributes.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_tip_and_trick_attribute" instance="Magestore\TipAndTrick\Observer\Sales\OrderLoadAfter" />
</event>
</config>

Step 4: Create a file a handle the event

Create a file app\code\Magento\TipandTrick\Observer\Sales\OrderLoadAfter.php to handle the event ‘sales_order_load_after’ which is declared above

<?php
namespace Magestore\TipAndTrick\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 = $order->getData('tip_and_trick_attribute');
    $extensionAttributes->setTipAndTrickAttribute($attr);
    $order->setExtensionAttributes($extensionAttributes);
}
private function getOrderExtensionDependency()
{
    $orderExtension = \Magento\Framework\App\ObjectManager::getInstance()->get(
        '\Magento\Sales\Api\Data\OrderExtension'
    );
    return $orderExtension;
}
}

In execute a function, you get the custom attribute from order data and set it into extension attributes of the orders.

Step 5: Delete folder to apply function

Delete folder var\generation to apply function setTipandTrickAttribute’ and ‘getTipandTrickAttribute’ in file‘var\generation\Magento\Sales\Api\Data\OrderExtension.php’. This file will be auto-created.

After getting an order on Magento 2 Rest API, you can see the custom attribute in the response.

Thanks for reading! for refrence:- https://magehit.com/blog/how-to-get-value-of-custom-attribute-on-magento-2-rest-api/

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