Laravel同步不适用于空数组 [英] Laravel sync not working with empty array

问题描述

我有一个看起来像这样的方法:

I've a method looks like this:

public function saveContacts(Request $request)
{
    if($request->contacts) {
        $contacts = collect($request->contacts)->pluck('id');
        $this->contacts()->sync($contacts->toArray());
    }
}

它正在工作，但是如果$request->contacts是一个空数组，它不会删除所有记录.这可能是什么情况?

It's working but if $request->contacts is an empty array it does not remove all records. What could be the case here?

推荐答案

您可以执行以下操作:

if ($request->contacts) {
    $contacts = collect($request->contacts)->pluck('id')->toArray();
    if (empty($contacts)) {
        $this->contacts()->detach();
    } else {
        $this->contacts()->sync($contacts);
    }
}

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