thinkphp/library/think/model/relation/HasManyThrough.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 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 think\db\Query;
use think\Exception;
use think\Loader;
use think\Model;
use think\model\Relation;

class HasManyThrough extends Relation
{
    // 中间关联表外键
    protected $throughKey;
    // 中间表模型
    protected $through;

    /**
     * 构造函数
     * @access   public
     * @param Model  $parent     上级模型对象
     * @param string $model      模型名
     * @param string $through    中间模型名
     * @param string $foreignKey 关联外键
     * @param string $throughKey 关联外键
     * @param string $localKey   关联主键
     */
    public function __construct(Model $parent, $model, $through, $foreignKey, $throughKey, $localKey)
    {
        $this->parent     = $parent;
        $this->model      = $model;
        $this->through    = $through;
        $this->foreignKey = $foreignKey;
        $this->throughKey = $throughKey;
        $this->localKey   = $localKey;
        $this->query      = (new $model)->db();
    }

    /**
     * 延迟获取关联数据
     * @param string   $subRelation 子关联名
     * @param \Closure $closure     闭包查询条件
     * @return false|\PDOStatement|string|\think\Collection
     */
    public function getRelation($subRelation = '', $closure = null)
    {
        if ($closure) {
            call_user_func_array($closure, [ & $this->query]);
        }

        return $this->relation($subRelation)->select();