vendor/topthink/think-orm/src/model/relation/HasManyThrough.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\Collection;
use think\db\BaseQuery as Query;
use think\helper\Str;
use think\Model;
use think\model\Relation;

/**
 * 远程一对多关联类
 */
class HasManyThrough extends Relation
{
    /**
     * 中间关联表外键
     * @var string
     */
    protected $throughKey;

    /**
     * 中间主键
     * @var string
     */
    protected $throughPk;

    /**
     * 中间表查询对象
     * @var Query
     */
    protected $through;

    /**
     * 架构函数
     * @access public
     * @param  Model  $parent     上级模型对象
     * @param  string $model      关联模型名
     * @param  string $through    中间模型名
     * @param  string $foreignKey 关联外键
     * @param  string $throughKey 中间关联外键
     * @param  string $localKey   当前模型主键
     * @param  string $throughPk  中间模型主键
     */
    public function __construct(Model $parent, string $model, string $through, string $foreignKey, string $throughKey, string $localKey, string $throughPk)
    {
        $this->parent     = $parent;
        $this->model      = $model;
        $this->through    = (new $through)->db();
        $this->foreignKey = $foreignKey;