View source  
  <?php
namespace Drupal\social_user\Plugin\GraphQL\SchemaExtension;
use Drupal\graphql\GraphQL\ResolverBuilder;
use Drupal\graphql\GraphQL\ResolverRegistryInterface;
use Drupal\social_graphql\Plugin\GraphQL\SchemaExtension\SchemaExtensionPluginBase;
use Drupal\social_user\GraphQL\UserActorTypeResolver;
class UserSchemaExtension extends SchemaExtensionPluginBase {
  
  public function registerResolvers(ResolverRegistryInterface $registry) {
    $builder = new ResolverBuilder();
    
    $registry
      ->addTypeResolver('Actor', new UserActorTypeResolver($registry
      ->getTypeResolver('Actor')));
    
    $registry
      ->addFieldResolver('Query', 'viewer', $builder
      ->produce('viewer'));
    $registry
      ->addFieldResolver('Query', 'users', $builder
      ->produce('query_user')
      ->map('after', $builder
      ->fromArgument('after'))
      ->map('before', $builder
      ->fromArgument('before'))
      ->map('first', $builder
      ->fromArgument('first'))
      ->map('last', $builder
      ->fromArgument('last'))
      ->map('reverse', $builder
      ->fromArgument('reverse'))
      ->map('sortKey', $builder
      ->fromArgument('sortKey')));
    $registry
      ->addFieldResolver('Query', 'user', $builder
      ->produce('entity_load_by_uuid')
      ->map('type', $builder
      ->fromValue('user'))
      ->map('uuid', $builder
      ->fromArgument('id')));
    
    $registry
      ->addFieldResolver('User', 'id', $builder
      ->produce('entity_uuid')
      ->map('entity', $builder
      ->fromParent()));
    $registry
      ->addFieldResolver('User', 'displayName', $builder
      ->produce('entity_label')
      ->map('entity', $builder
      ->fromParent()));
    $registry
      ->addFieldResolver('User', 'mail', $builder
      ->fromPath('entity:user', 'mail.value'));
    $registry
      ->addFieldResolver('User', 'created', $builder
      ->fromPath('entity:user', 'created.value'));
    $registry
      ->addFieldResolver('User', 'updated', $builder
      ->fromPath('entity:user', 'changed.value'));
    $registry
      ->addFieldResolver('User', 'status', $builder
      ->produce('user_status')
      ->map('user', $builder
      ->fromParent()));
    $registry
      ->addFieldResolver('User', 'roles', $builder
      ->produce('user_roles')
      ->map('user', $builder
      ->fromParent()));
  }
}