think\model\Relation::hasManyThrough PHP Метод

    public function hasManyThrough($model, $through, $foreignKey, $throughKey, $localKey, $alias)
    {
        // 记录当前关联信息
        $this->type = self::HAS_MANY_THROUGH;
        $this->model = $model;
        $this->middle = $through;
        $this->foreignKey = $foreignKey;
        $this->throughKey = $throughKey;
        $this->localKey = $localKey;
        $this->alias = $alias;
        $this->query = (new $model())->db();
        // 返回关联的模型对象
        return $this;
    }