[radmen]

The problem

I'm trying to integrate the Shopify GQL introspection proxy (https://shopify.dev/admin-graphql-direct-proxy/2026-10) for one of our tools.

It's using the following query to get the introspection:

Introspection::getIntrospectionQuery([
    'descriptions' => true,
    'directiveIsRepeatable' => false,
    'schemaDescription' => false,
    'specifiedByURL' => false,
    'typeIsOneOf' => false,
])

Turns out, the isOneOf is not propagated to the InputObjectType. It is in the JSON response, but the object doesn't receive it.

I made this fix with the help of the AI. Please let me know if there is something I should fix.

Reproduction script

  <?php declare(strict_types=1);

  // Usage: php repro.php /path/to/graphql-php
  require $argv[1] . '/vendor/autoload.php';

  use GraphQL\Type\Introspection;
  use GraphQL\Utils\BuildClientSchema;

  $query = Introspection::getIntrospectionQuery(['typeIsOneOf' => true]);

  $response = file_get_contents('https://shopify.dev/admin-graphql-direct-proxy/2026-10', false, stream_context_create([
      'http' => [
          'method' => 'POST',
          'header' => 'Content-Type: application/json',
          'content' => json_encode(['query' => $query]),
      ],
  ]));

  $introspection = json_decode($response, true, flags: JSON_THROW_ON_ERROR)['data'];

  $fromShopify = array_column($introspection['__schema']['types'], 'isOneOf', 'name')['ProductIdentifierInput'];
  $schema = BuildClientSchema::build($introspection);

  echo 'Shopify sends isOneOf: ', var_export($fromShopify, true), PHP_EOL;
  echo 'Built schema isOneOf:  ', var_export($schema->getType('ProductIdentifierInput')->isOneOf(), true), PHP_EOL;

Changelog

Fixed

• Preserve isOneOf on input object types built with BuildClientSchema::build()