vendor/topthink/think-orm/src/model/relation/HasOneThrough.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\model\relation;

use Closure;
use think\helper\Str;
use think\Model;

/**
 * 远程一对一关联类
 */
class HasOneThrough extends HasManyThrough
{

    /**
     * 延迟获取关联数据
     * @access public
     * @param  array   $subRelation 子关联名
     * @param  Closure $closure     闭包查询条件
     * @return Model
     */
    public function getRelation(array $subRelation = [], Closure $closure = null)
    {
        if ($closure) {
            $closure($this->getClosureType($closure));
        }

        $this->baseQuery();

        $relationModel = $this->query->relation($subRelation)->find();

        if ($relationModel) {
            $relationModel->setParent(clone $this->parent);
        }

        return $relationModel;
    }

    /**
     * 预载入关联查询（数据集）
     * @access protected
     * @param  array   $resultSet   数据集
     * @param  string  $relation    当前关联名
     * @param  array   $subRelation 子关联名
     * @param  Closure $closure     闭包
     * @param  array   $cache       关联缓存
     * @return void
     */
    public function eagerlyResultSet(array &$resultSet, string $relation, array $subRelation = [], Closure $closure = null, array $cache = []): void
    {
        $localKey   = $this->localKey;