ExampleSchema.php in GraphQL 8.4

Namespace

Drupal\graphql_examples\Plugin\GraphQL\Schema

File

examples/graphql_example/src/Plugin/GraphQL/Schema/ExampleSchema.php

<?php

namespace Drupal\graphql_examples\Plugin\GraphQL\Schema;

use Drupal\graphql\GraphQL\ResolverBuilder;
use Drupal\graphql\GraphQL\ResolverRegistry;
use Drupal\graphql\Plugin\GraphQL\Schema\SdlSchemaPluginBase;
use Drupal\graphql_examples\Wrappers\QueryConnection;

/**
 * @Schema(
 *   id = "example",
 *   name = "Example schema"
 * )
 */
class ExampleSchema extends SdlSchemaPluginBase {

  /**
   * {@inheritdoc}
   */
  public function getResolverRegistry() {
    $builder = new ResolverBuilder();
    $registry = new ResolverRegistry();
    $this
      ->addQueryFields($registry, $builder);
    $this
      ->addArticleFields($registry, $builder);

    // Re-usable connection type fields.
    $this
      ->addConnectionFields('ArticleConnection', $registry, $builder);
    return $registry;
  }

  /**
   * @param \Drupal\graphql\GraphQL\ResolverRegistry $registry
   * @param \Drupal\graphql\GraphQL\ResolverBuilder $builder
   */
  protected function addArticleFields(ResolverRegistry $registry, ResolverBuilder $builder) : void {
    $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()), $builder
      ->produce('uppercase')
      ->map('string', $builder
      ->fromParent())));
    $registry
      ->addFieldResolver('Article', 'author', $builder
      ->compose($builder
      ->produce('entity_owner')
      ->map('entity', $builder
      ->fromParent()), $builder
      ->produce('entity_label')
      ->map('entity', $builder
      ->fromParent())));
  }

  /**
   * @param \Drupal\graphql\GraphQL\ResolverRegistry $registry
   * @param \Drupal\graphql\GraphQL\ResolverBuilder $builder
   */
  protected function addQueryFields(ResolverRegistry $registry, ResolverBuilder $builder) : void {
    $registry
      ->addFieldResolver('Query', 'article', $builder
      ->produce('entity_load')
      ->map('type', $builder
      ->fromValue('node'))
      ->map('bundles', $builder
      ->fromValue([
      'article',
    ]))
      ->map('id', $builder
      ->fromArgument('id')));
    $registry
      ->addFieldResolver('Query', 'articles', $builder
      ->produce('query_articles')
      ->map('offset', $builder
      ->fromArgument('offset'))
      ->map('limit', $builder
      ->fromArgument('limit')));
  }

  /**
   * @param string $type
   * @param \Drupal\graphql\GraphQL\ResolverRegistry $registry
   * @param \Drupal\graphql\GraphQL\ResolverBuilder $builder
   */
  protected function addConnectionFields($type, ResolverRegistry $registry, ResolverBuilder $builder) : void {
    $registry
      ->addFieldResolver($type, 'total', $builder
      ->callback(function (QueryConnection $connection) {
      return $connection
        ->total();
    }));
    $registry
      ->addFieldResolver($type, 'items', $builder
      ->callback(function (QueryConnection $connection) {
      return $connection
        ->items();
    }));
  }

}

Classes

Name	Description
ExampleSchema	Plugin annotation @Schema( id = "example", name = "Example schema" )