Drupal 8.x + GraphQL 模块自定义类型/字段插件接收错误“字段必须是字段名称作为键的对象”

Question

我正在尝试创建一个模块来定义它自己的自定义类型和相关的字段插件。

安装后，GraphQLi 在控制台报如下错误：

未捕获的错误：CustomTypeInterface 字段必须是字段名称作为键的对象或返回此类对象的函数。

Drupal 8.61。我已经尝试过 GraphQL 3.0-RC2 和 3.x-Dev。任何帮助将非常感激。谢谢。

我的代码如下：

/graphql_custom.info.yml

name: GraphQL Custom Type Example
type: module
description: ''
package: GraphQL
core: 8.x
dependencies:
  - graphql_core

/src/CustomObject.php

namespace Drupal\graphql_custom;

class CustomObject {
    protected $data;

    function __construct(String $data) {
        $this->data = $data;
    }

    function getData() {
        return $this->data;
    }
}

/src/Plugin/GraphQL/Fields/CustomField.php

<?php

namespace Drupal\graphql_custom\Plugin\GraphQL\Fields;

use Drupal\graphql_custom\CustomObject;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\graphql\GraphQL\Execution\ResolveContext;
use Drupal\graphql\Plugin\GraphQL\Fields\FieldPluginBase;
use GraphQL\Type\Definition\ResolveInfo;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Created Custom Object with argument as data.
 *
 * @GraphQLField(
 *   id = "custom_field",
 *   secure = true,
 *   name = "customfield",
 *   type = "CustomType",
 *   nullable = true,
 *   arguments = {
 *     "argument" = "String!"
 *   }
 * )
 */
class CustomField extends FieldPluginBase implements ContainerFactoryPluginInterface {
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static(
            $configuration,
            $plugin_id,
            $plugin_definition
        );
    }

    /**
     * {@inheritdoc}
     */
    protected function isLanguageAwareField() {
        return FALSE;
    }

    /**
     * {@inheritdoc}
     */
    public function resolve($value, array $args, ResolveContext $context, ResolveInfo $info) {
        return parent::resolve($value, $args, $context, $info);
    }

    /**
     * {@inheritdoc}
     */
    public function resolveValues($value, array $args, ResolveContext $context, ResolveInfo $info) {
        $arg = $args['argument'];
        $object = new CustomObject($arg);

        yield $object;
    }
}

/src/Plugin/GraphQL/Fields/CustomFieldData.php

<?php

namespace Drupal\graphql_custom\Plugin\GraphQL\Fields;

use Drupal\graphql_custom\CustomObject;
use Drupal\graphql\Plugin\GraphQL\Fields\FieldPluginBase;
use Drupal\graphql\GraphQL\Execution\ResolveContext;
use GraphQL\Type\Definition\ResolveInfo;

/**
 * Custom Type Data Field
 *
 * @GraphQLField(
 *   id = "custom_field_data",
 *   secure = true,
 *   name = "data",
 *   type = "String",
 *   parents = {"CustomType"}
 * )
 */

class CustomFieldData extends FieldPluginBase {
    /**
     * {@inheritdoc}
     */
    protected function resolveValues($value, array $args, $context, $info) {
        if ($value instanceOf CustomObject) {
            yield (string) $value->getData();
        } else {
            yield (string) "Empty";
        }
    }
}

/src/Plugin/GraphQL/Interfaces/CustomTypeInterface.php

<?php

namespace Drupal\graphql_custom\Plugin\GraphQL\Interfaces;

use Drupal\graphql_custom\CustomObject;
use Drupal\graphql\Annotation\GraphQLInterface;
use Drupal\graphql\Plugin\GraphQL\Interfaces\InterfacePluginBase;

/**
 * Interface for Custom Type.
 *
 * For simplicity reasons, this example does not utilize dependency injection.
 *
 * @GraphQLInterface(
 *   id = "custom_type_interface",
 *   name = "CustomTypeInterface"
 * )
 */

class CustomTypeInterface extends InterfacePluginBase {
    /**
     * {@inheritdoc}
     */
    public function resolveType($object) {
        if ($object instanceof CustomObject) {
            $schemaManager = \Drupal::service('graphql_core.schema_manager');

            return $schemaManager->findByName('CustomType', [
                    GRAPHQL_CORE_TYPE_PLUGIN,
                ]);
        }
    }
}

/src/Plugin/GraphQL/Types/CustomType.php

<?php
namespace Drupal\graphql_custom\Plugin\GraphQL\Types;

use Drupal\graphql_custom\CustomObject;
use Drupal\graphql\Plugin\GraphQL\Types\TypePluginBase;
use Drupal\graphql\GraphQL\Execution\ResolveContext;
use GraphQL\Type\Definition\ResolveInfo;

/**
 * GraphQL Custom Type.
 *
 * @GraphQLType(
 *   id = "custom_type",
 *   name = "CustomType",
 *   interfaces = {"CustomTypeInterface"}
 * )
 */

class CustomType extends TypePluginBase {
    /**
     * {@inheritdoc}
     */
    public function applies($object, ResolveContext $context, ResolveInfo $info) {
        return $object instanceof CustomObject;
    }
}

Answer 1

对于您的字段，您应该在父母中使用接口引用而不是类型：

parents = {"CustomTypeInterface"}

另一种方法是删除接口并使用示例中提到的直接类型引用。