WishlistResolver.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\WishlistGraphQl\Model\Resolver;

use Magento\Framework\GraphQl\Config\Element\Field;
use Magento\Framework\GraphQl\Query\ResolverInterface;
use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
use Magento\Wishlist\Model\ResourceModel\Wishlist as WishlistResourceModel;
use Magento\Wishlist\Model\Wishlist;
use Magento\Wishlist\Model\WishlistFactory;

/**
 * Fetches the Wishlist data according to the GraphQL schema
 */
class WishlistResolver implements ResolverInterface
{
    /**
     * @var WishlistResourceModel
     */
    private $wishlistResource;

    /**
     * @var WishlistFactory
     */
    private $wishlistFactory;

    /**
     * @param WishlistResourceModel $wishlistResource
     * @param WishlistFactory $wishlistFactory
     */
    public function __construct(WishlistResourceModel $wishlistResource, WishlistFactory $wishlistFactory)
    {
        $this->wishlistResource = $wishlistResource;
        $this->wishlistFactory = $wishlistFactory;
    }

    /**
     * @inheritdoc
     */
    public function resolve(
        Field $field,
        $context,
        ResolveInfo $info,
        array $value = null,
        array $args = null
    ) {
        $customerId = $context->getUserId();

        /** @var Wishlist $wishlist */
        $wishlist = $this->wishlistFactory->create();
        $this->wishlistResource->load($wishlist, $customerId, 'customer_id');

        if (null === $wishlist->getId()) {
            return [];
        }

        return [
            'sharing_code' => $wishlist->getSharingCode(),
            'updated_at' => $wishlist->getUpdatedAt(),
            'items_count' => $wishlist->getItemsCount(),
            'name' => $wishlist->getName(),
            'model' => $wishlist,
        ];
    }
}