php - 如何在 Laravel PHP 框架中合并两个集合而不删除(丢失)键？

Question

我是 Laravel/PHP 的新手，我正在做我的个人“玩具项目”，我遇到了一个我在谷歌上搜索了很长时间的问题。但是，我想不出一个完美的解决方案。

问题是，我有两个集合 $questions和 $answers ，我想将它们合并为一个大集合。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"
}
]

我试过 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 ，我再也找不到问题了，但我确实想在 $data 中找到它收藏。此外，我尝试过类似 union 的命令。 , 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]);
}

Answer 1

这是因为扩展支持集合的 Eloquent 集合使用一个字典，该字典由合并时包含的模型实例的键作为键。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像这样的 Eloquent Collections。

您可以从 Eloquent 集合之一中获取支持集合并将另一个集合合并到其中。
$collection->toBase()会给你一个Illuminate\Support\Collection来自您的 Illuminate\Database\Eloquent\Collection .

你可以试试:

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