Magento 2 – Save Custom Customer Attribute Value Programmatically

Here in this example, I have tried to save custom attribute value using the Controller file in custom extension. To fix this issue, firstly we need to create ‘controller.php’ file at below location.

app\code\Vendor\Extension\Controller\Index

<?php
Namespace Vendor\Extension\Controller\Index;

class Controller extends \Magento\Framework\App\Action\Action
{

protected $customer;

protected $customerFactory;

public function __construct(
    \Magento\Customer\Model\Customer $customer
    \Magento\Customer\Model\ResourceModel\CustomerFactory $customerFactory
)
{
    $this->customer = $customer;
    $this->customerFactory = $customerFactory;
}

public function execute()
{

    $custom = $this->_customerFactory ->create();
    $custom = $custom->setWebsiteId($helperData->getWebsiteId());
    $custom = $custom->loadByEmail("abc123@xyz.com");
    $custom->setCustomAttributeCode(custom attribute value);   

  // Main code to resolve this issue.
    $customerData = $custom->getDataModel();
    $customerData->setCustomAttribute('custom_attribute code', 'custom attribute value');
    $custom->updateData($customerData);

    $custom->save();
}
}

For more refrance click here

Note : Above code is not tested. you have to check.

I hope it helps!

As you have using Api interface, So, you have to add hide_address as an extension attribute of Magento\Customer\Api\Data\AddressInterface.

Create a <Module>/etc/extension_attributes.xml file to define a hide_address extension attribute.

<?xml version="1.0"?>
<!-- 
/**
 *
 * @author Amit Bera
 * @copyright Copyright (c) 2018-2020 amitbera.com
 */
 -->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Api/etc/extension_attributes.xsd">
    <extension_attributes for="Magento\Customer\Api\Data\AddressInterface">
        <attribute code="hide_address" type="int"/>
    </extension_attributes>
</config>

Save using below code:

$address->setFirstname('Shoaib')
    ->setLastname('Munir')
    ->setCountryId('pk')
    ->setCity('ABC')
    ->setPostcode('12345')
    ->setCustomerId(2)
    ->setStreet(array('Line 1','Line 2'))
    ->setTelephone('1234567')
    ->setFax('12345')
    ->setVatId('12345')
    ->setIsDefaultBilling('1')
    ->setIsDefaultShipping('1');

$addressExtension = $address->getExtensionAttributes();
if(null === $addressExtension){
  // $addressExtensionFactory is instance of \Magento\Customer\Api\Data\AddressExtensionFactory
 $addressExtension =$addressExtensionFactory->create(); 
}

$addressExtension->setHideAddress(1)
$address->setExtensionAttributes($addressExtension);

I am not sure why this is saving. Please assign attribute set to this attribute and see what happen:

/** @var \Magento\Eav\Setup\EavSetup $eavSetup */
$eavSetup->addAttributeToSet(
            \Magento\Customer\Api\AddressMetadataInterface::ENTITY_TYPE_ADDRESS,
            \Magento\Customer\Api\AddressMetadataInterface::ATTRIBUTE_SET_ID_CUSTOMER,
            null,'hide_address');

Source: Magento2 : user define customer attribute not save value while create / save from admin