如何更改急切加载的连接？答案

【问题标题】：How to change connection of eager loading?如何更改急切加载的连接？
【发布时间】：2020-05-09 05:11:15
【问题描述】：

这些是我的模型

class Posts extends Model {
    protected $connection = 'connection_1';

    public function comments()
    {
        $model = new Comments();
        $model->setConnection($this->connection);

        return $this->hasMany($model, 'comments_id');
    }

}

class Comments extends Model {
    protected $connection = 'connection_1';

    public function author()
    {
        $model = new Authors();
        $model->setConnection($this->connection);

        return $this->hasOne($model, 'id', 'authors_id');
    }

    public function post()
    {
        $model = new Posts();
        $model->setConnection($this->connection);

        return $this->hasOne($model, 'id', 'posts_id');
    }

}

class Authors extends Model {
    protected $connection = 'connection_1';

    public function comments()
    {
        $model = new Comments();
        $model->setConnection($this->connection);

        return $this->hasMany($model, 'authors_id');
    }

}

当我将此代码放入我的控制器时，评论模型已连接到 connection_2 但作者为空，我猜它不会更改与 connection_2 的连接

$posts = new Posts;
$posts->setConnection('connection_2');
$posts->load("comments.author")->get();

如何动态更改 Authors 模型连接，或者为什么 Authors 为空？

【问题讨论】：

标签： laravel eager-loading

【解决方案1】：

我已经这样解决了我的问题：

$conn   = \App\Helpers\Helper::connection($item_id);
$newPdo = \DB::connection($conn)->getPdo();
\DB::setPdo($newPdo);

$posts = \App\Posts::with("comments.author")->get();

在我的助手中

public static function connection($project) {
    switch($project) {
        case 01:
            return 'connection_01';
        break;
        case 02:
            return 'connection_02';
        break;
        case 03:
            return 'connection_03';
        break;
    }
}

【讨论】：