ComposableSchemaExampleExtension.php in GraphQL 8.4

Namespace

Drupal\graphql_composable\Plugin\GraphQL\SchemaExtension

File

examples/graphql_composable/src/Plugin/GraphQL/SchemaExtension/ComposableSchemaExampleExtension.php

<?php

namespace Drupal\graphql_composable\Plugin\GraphQL\SchemaExtension;

use Drupal\graphql\GraphQL\ResolverBuilder;
use Drupal\graphql\GraphQL\ResolverRegistryInterface;
use Drupal\graphql\GraphQL\Response\ResponseInterface;
use Drupal\graphql\Plugin\GraphQL\SchemaExtension\SdlSchemaExtensionPluginBase;
use Drupal\graphql_composable\GraphQL\Response\ArticleResponse;

/**
 * @SchemaExtension(
 *   id = "composable_extension",
 *   name = "Composable Example extension",
 *   description = "A simple extension that adds node related fields.",
 *   schema = "composable"
 * )
 */
class ComposableSchemaExampleExtension extends SdlSchemaExtensionPluginBase {

  /**
   * {@inheritdoc}
   */
  public function registerResolvers(ResolverRegistryInterface $registry) : void {
    $builder = new ResolverBuilder();
    $registry
      ->addFieldResolver('Query', 'article', $builder
      ->produce('entity_load')
      ->map('type', $builder
      ->fromValue('node'))
      ->map('bundles', $builder
      ->fromValue([
      'article',
    ]))
      ->map('id', $builder
      ->fromArgument('id')));

    // Create article mutation.
    $registry
      ->addFieldResolver('Mutation', 'createArticle', $builder
      ->produce('create_article')
      ->map('data', $builder
      ->fromArgument('data')));
    $registry
      ->addFieldResolver('ArticleResponse', 'article', $builder
      ->callback(function (ArticleResponse $response) {
      return $response
        ->article();
    }));
    $registry
      ->addFieldResolver('ArticleResponse', 'errors', $builder
      ->callback(function (ArticleResponse $response) {
      return $response
        ->getViolations();
    }));
    $registry
      ->addFieldResolver('Article', 'id', $builder
      ->produce('entity_id')
      ->map('entity', $builder
      ->fromParent()));
    $registry
      ->addFieldResolver('Article', 'title', $builder
      ->compose($builder
      ->produce('entity_label')
      ->map('entity', $builder
      ->fromParent())));
    $registry
      ->addFieldResolver('Article', 'author', $builder
      ->compose($builder
      ->produce('entity_owner')
      ->map('entity', $builder
      ->fromParent()), $builder
      ->produce('entity_label')
      ->map('entity', $builder
      ->fromParent())));

    // Response type resolver.
    $registry
      ->addTypeResolver('Response', [
      __CLASS__,
      'resolveResponse',
    ]);
  }

  /**
   * Resolves the response type.
   *
   * @param \Drupal\graphql\GraphQL\Response\ResponseInterface $response
   *   Response object.
   *
   * @return string
   *   Response type.
   *
   * @throws \Exception
   *   Invalid response type.
   */
  public static function resolveResponse(ResponseInterface $response) : string {

    // Resolve content response.
    if ($response instanceof ArticleResponse) {
      return 'ArticleResponse';
    }
    throw new \Exception('Invalid response type.');
  }

}

Classes

Name	Description
ComposableSchemaExampleExtension	Plugin annotation @SchemaExtension( id = "composable_extension", name = "Composable Example extension", description = "A simple extension that adds node related fields.", schema = "composable" )