How to change custom customer attributes with GraphQL mutation?

Question

I followed this answer to create a custom attribute on customer with graphQL. The query works great, but if I try to change the value with a mutation, it just returns null. Can anyone please help me with adding this functionality please? Code and example below:

schema.graphql:

type Customer {
 sample_attribute: String @doc(description: "Customer Custom Attribute Show")
 @resolver(
 class: "\\Wrightway\\CustomGraphQl\\Model\\Resolver\\GetCustomerCustomAttr"
 )
}
input CustomerInput {
 sample_attribute: String @doc(description: "Customer Custom Attribute Val")
}

Model/Resolver/GetCustomerCustomAttr.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare (strict_types = 1);
namespace Wrightway\CustomGraphQl\Model\Resolver;
use Magento\Customer\Api\Data\CustomerInterface;
use Magento\Framework\Exception\LocalizedException;
use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
/**
 * Customer custom attribute field resolver
 */
class GetCustomerCustomAttr implements ResolverInterface
{
 /**
 * @var Magento\Customer\Api\CustomerRepositoryInterface
 */
 protected $customerRepositoryInterface;
 /**
 * @param Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface
 */
 public function __construct(
 \Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface
 ) {
 $this->customerRepositoryInterface = $customerRepositoryInterface;
 }
 /**
 * @inheritdoc
 */
 public function resolve(
 Field $field,
 $context,
 ResolveInfo $info,
 array $value = null,
 array $args = null
 ) {
 if (!isset($value['model'])) {
 throw new LocalizedException(__('"model" value should be specified'));
 }
 /** @var CustomerInterface $customer */
 $customer = $value['model'];
 $customerId = (int) $customer->getId();
 $customerData = $this->customerRepositoryInterface->getById($customerId);
 /* Get customer custom attribute value */
 if ($customer->getCustomAttribute('sample_attributess')) {
 $customerAttributeVal = $customer->getCustomAttribute('sample_attributess')->getValue();
 } else {
 $customerAttributeVal = null;
 }
 return $customerAttributeVal;
 }
}

Query example (works great):

{
 customer {
 firstname
 sample_attribute
 }
}

returns:

{
 "data": {
 "customer": {
 "firstname": "Adam",
 "sample_attribute": null
 }
 }
}

Mutation example (doesn't work, returns null when attempted to change data):

mutation {
 updateCustomer(
 input: {
 firstname: "Adam",
 sample_attribute: "This is sample text"
 }
 ) {
 customer {
 firstname
 sample_attribute
 }
 }
}

returns (The added data, "This is sample text" returns null, and also returns null on the query.:

{
 "data": {
 "updateCustomer": {
 "customer": {
 "firstname": "Adam",
 "sample_attribute": null
 }
 }
 }
}

What do I need to add to make this work? Help much appreciated.

Answer 1

I have written an example that interacts with 2 extension attributes. One is called preferred_colour and it does the same thing as your sample_attribute extension attribute

My graphql is like below:

type Customer { 
 preferred_colour: String
 @doc(description: "Customer Preferred Colour")
 @resolver(class: "\\Mbs\\CustomerAttribute\\Model\\Resolver\\GetCustomerPreferredColour")
}
input CustomerInput {
 preferred_colour: String
}

You need a customer repository plugin like below

<type name="Magento\Customer\Api\CustomerRepositoryInterface">
 <plugin name="save_additional_customer_info" type="Mbs\CustomerAttribute\Plugin\AssignAdditionalData" />
 </type>

I add below the plugin code

class AssignAdditionalData
{
 private \Mbs\CustomerAttribute\Model\AdditionalCustomerInfoHandler $additionalCustomerInfoHandler;
 /**
 * @param AdditionalCustomerInfoHandler $additionalCustomerInfoHandler
 */
 public function __construct(
 \Mbs\CustomerAttribute\Model\AdditionalCustomerInfoHandler $additionalCustomerInfoHandler
 ) {
 $this->additionalCustomerInfoHandler = $additionalCustomerInfoHandler;
 }
 public function afterGet(
 \Magento\Customer\Api\CustomerRepositoryInterface $subject,
 \Magento\Customer\Api\Data\CustomerInterface $customer
 ) {
 $this->addAdditionalInfoExtensionAttribute($customer);
 return $customer;
 }
 public function afterGetList(
 \Magento\Customer\Api\CustomerRepositoryInterface $subject,
 \Magento\Customer\Api\Data\CustomerSearchResultsInterface $results
 ) {
 array_map([$this, 'addAdditionalInfoExtensionAttribute'], $results->getItems());
 return $results;
 }
 ..
}

As you can see the plugin hydrates the customer data from the extension attributes data

I add the url to a public repository so that you can see the full code.

customer attribute repository. Particularly, within this code, the class \Mbs\CustomerAttribute\Model\AdditionalCustomerInfoHandler is what you may want to take a look at.

• Adam Wright: Thank you, this is a huge help!
• Herve Tribouilloy: my pleasure, feel free to thumb up it, it will give me 10 more points :-)