Laravel 5.2 Foreach 按日期排序

Question

我做了一个视图，显示一个帖子和对该帖子的回复。对于这个问题，回复是在 foreach 循环中并按随机顺序进行的。有没有办法对 foreach 循环进行排序，以便最早的回复位于顶部？最旧的回复在底部？。

这是循环

 @foreach($topic->replies as $reply)
         <div class="collection">
            <div class="collection-item row">
               <div class="col s3">
                  <div href="" class="avatar collection-link">
                     <div class="row">
                        <div class="col s3"><img src="/uploads/avatars/{{ $reply->user->avatar }}" alt="" class="circle" style="width: 50px;"></div>
                           <div class="col s9">
                              <p class="user-name">{{ $reply->user->username }}</p>
                           </div>
                        </div>
                              <p>Role: {{ $reply->user->role->role_name }}</p>
                              <p>Since: {{ $reply->user->created_at }}</p>
                              <p class="post-timestamp">Posted on: {{ $reply->created_at }}</p>
                     </div>
                   </div>
                   <div class="col s9">
                      <div class="row last-row">
                        <div class="col s12">
                           <p>{!! $reply->reply_text !!}</p>
                        </div>
                      </div>
                      <div class="row last-row block-timestamp">
                        <div class="col s6">
                           <p class="post-timestamp">Last changed: {{ $reply->updated_at }}</p>
                        </div>
                      </div>
                 </div>
             </div>
         </div>
 @endforeach

TopicsController.php（显示方法）

public function show($theme_id, $topic_id)
{
    $theme = Theme::with('topics')->findOrFail($theme_id);
    $topic = Topic::with('theme')->findOrFail($topic_id);

    return view('topics.topic')->withTopic($topic)->withTheme($theme);

}

提前致谢！

Answer 1

所有Eloquent查询都返回Laravel 集合。因此，您可以使用该sortBy函数在 foreach 中对回复进行排序。

@foreach($topic->replies->sortByDesc('created_at') as $reply)

但是，更好的解决方案是在查询中对您的回复进行排序。这可以通过像这样更新你的 Eloquent 查询来实现：

$topic = Topic::with([
    'theme',
    'replies' => function ($query) {
        $query->orderByDesc('created_at');
    }
])
->findOrFail($topic_id);