Question

我有一个模型Shop和一个模型Comment。

在Comment模型上：

public function shop()
    {
        return $this->belongsTo('App\Shop', 'commentable_id');
    }

Shop模型是：

public function comments() {       
        return $this->hasMany('App\Comment', 'commentable_id');
    }

所以这种关系是一对多的

我想复制Shop的所有注释并将它们附加到另一个Shop：

$shop = Shop::find(1);
$comments = $shop->comments()->pluck('id')->toArray(); // it works, i have all the ids of the comments

$othershop = Shop::find(2);
$othershop->comments()->associate($comments); // doesn't work
$othershop->comments()->attach($comments); // doesn't work

有人知道如何处理一对多情况吗？

Answer 1

您可以使用createMany的关系方法：

$othershop->comments()->createMany($shop->comments->toArray());

如果一家商店可以有很多评论（也可以将其拆分为更多查询以提高存储效率），您还可以利用分块：

$shop->comments()->chunk(500, function ($comments) use ($othershop) {
    $othershop->comments()->createMany($comments->toArray());
});

编辑：根据评论更改了我的答案。

Answer 2

要复制评论，您首先需要复制它们。然后，您可以将它们与他们自己的模型相关联：

$shop = Shop::find(1);
$otherShop = Shop::find(2);

$comments = $shop->comments()->get();
foreach ($comments as $comment) {
    $tmp = $comment->replicate();
    $tmp->shop()->associate($otherShop);
    $tmp->save();
}

一对多的同事

2 个答案: