如何在 Laravel PHP 框架中合并两个集合而不丢失（丢失）键？

我是 Laravel/PHP 的新手，我正在做我的个人“玩具项目”，我遇到了一个我已经在 Google 上搜索了很长时间的问题。但是，我无法找出完美的解决方案。

问题是，我有两个集合$questions and $answers，我想将它们合并到一个大集合中。这是这两个集合的结构/示例

$questions:

questions: [
{
    id: 1,
    title: "Why do PHP developers love Laravel? What are the things that distinguish Laravel from other PHP frameworks?",
    desc: null,
    user_id: 2,
    created_at: "2018-07-15 06:45:57",
    updated_at: "2018-07-15 06:45:57",
    status: "ok"
}
]

$answers:

answers: [
{
    id: 2,
    content: "Laravel is usually considered as PHP on rails! It is amazing!",
    user_id: 2,
    question_id: 1,
    created_at: "2018-07-15 07:11:39",
    updated_at: "2018-07-15 07:11:39"
},
{
    id: 1,
    content: "PHP is the best programming language in the world! [smile]",
    user_id: 1,
    question_id: 1,
    created_at: "2018-07-15 07:02:21",
    updated_at: "2018-07-15 07:05:12"
}
]

我努力了merge命令，我得到了这样的东西：

$data = $questions->merge($answers);
$data = $data->sortByDesc(function($item) {
    return $item->created_at;
});




data: [
{
    id: 2,
    content: "Laravel is usually considered as PHP on rails! It is amazing!",
    user_id: 2,
    question_id: 1,
    created_at: "2018-07-15 07:11:39",
    updated_at: "2018-07-15 07:11:39"
},
{
    id: 1,
    content: "PHP is the best programming language in the world! [smile]",
    user_id: 1,
    question_id: 1,
    created_at: "2018-07-15 07:02:21",
    updated_at: "2018-07-15 07:05:12"
}
]

注意到，在$data，我找不到这个问题了，但我确实想在$data收藏。此外，我尝试过类似的命令union, push, put，他们都没有给出令人满意的解决方案。

我的代码有问题还是我根本无法在 PHP 中执行此操作？如果我的代码中有错误，我已经粘贴在这里。

public function timeline()
{
    list($limit, $skip) = paginate(rq('page'), rq('limit'));

    /* Retrieve questions, $questions is like I pasted above*/
    $questions = question_init()
        ->limit($limit)
        ->skip($skip)
        ->orderBy('created_at', 'desc')
        ->get();

    /* Retrieve answers, $answers is like I pasted above */
    $answers = answer_init()
        ->limit($limit)
        ->skip($skip)
        ->orderBy('created_at', 'desc')
        ->get();        

    /* Merge questions and answers */
    $data = $questions->merge($answers);

    /* Sort by Created time */
    $data = $data->sortByDesc(function($item) {
        return $item->created_at;
    });

    $data = $data->values()->all();

    return succ(['questions' => $questions, 'answers' => $answers, 'data' => $data]);
}

这是因为扩展支持集合的 Eloquent 集合使用一个字典，该字典以合并时包含的模型实例的键为键。它们具有专门用于处理模型集合的特殊功能。通常你不会因为这个原因合并 Eloquent Collections。

您可以从 Eloquent 集合之一中获取支持集合，并将其他集合合并到其中。

$collection->toBase()会给你一个Illuminate\Support\Collection从你的Illuminate\Database\Eloquent\Collection.

你可以试试：

$data = $questions->toBase()->merge($answers);