Php Laravel奇怪的查询不'；我不想工作

我正在尝试获取表

注释的用户名，但效果不太好

首先，当我执行查询时

select `comments`.`username` from `comments` inner join `threads` on `comments`.`tid` = `threads`.`tid` where `comments`.`deleted_at` is null and `threads`.`cid` = 4 order by `comments`.`posted_at` desc limit 1

它确实返回它需要返回的值

请注意，此查询中的数字
4
表示int（）

现在，我尝试了很多东西，以使这项工作适当地在拉威尔，但它不

因此，我的视图中有一个
foreach
循环，需要显示
comments.username
中的用户名

我怎样才能做到这一点

每次我尝试某样东西，我都会感到刺痛，或者其他什么东西

使用
$categorie->id
调用
cid
的
id

这是我的代码：

@foreach($categories as $categorie)
              @if($categorie->fid == $forum->fid)
              <td class="topic-marker-forum">
                <i class="fa fa-comments fa-3x"></i>
              </td>

              <td class="col-md-6 col-sm-6">
                <div><a href="Categorie-{{ Str::slug($categorie->name) }}" title="{{ $categorie->name }}"><strong>{{ $categorie->name }}</strong></a></div>
                <div class=""><em>{{ $categorie->description }}</em></div>

              </td>

              <td class="col-md-1 col-sm-1 text-right"><span class="badge">{{ Thread::where('cid', '=', $categorie->id)->remember(15)->count() }}</span></td>

              <td class="col-md-4 col-sm-4 ">
                <div>
                  @if(Thread::where('cid', '=', $categorie->id)->exists() && Comment::join('threads', 'comments.tid', '=', 'threads.tid')->where('threads.cid', '=', $categorie->id)->orderBy('comments.posted_at', 'DESC')->exists())
                    <a href="{{ Config::get('app.url') }}/Thread-{{ Thread::where('cid', '=', $categorie->id)->orderBy('date_posted', 'DESC')->pluck('slug') }}">{{ Helper::HTMLFilter(Thread::where('cid', '=', $categorie->id)->orderBy('date_posted', 'DESC')->pluck('title')) }}</a><br>

                    <i class="fa fa-clock-o"></i> {{ \Carbon\Carbon::createFromFormat('Y-m-d H:i:s', Comment::join('threads', 'comments.tid', '=', 'threads.tid')->where('threads.cid', '=', $categorie->id)->orderBy('comments.posted_at', 'DESC')->pluck('posted_at'))->format('d/m/Y H:i') }}<br>

                    <i class="fa fa-user"></i> <a href="{{ Config::get('app.url') }}/User-query here">query here</a>
                  @else
                  <b>-</b>
                  @endif
                </div>
              </td>
            </tr>
            @endif
            @endforeach

型号：



执行此操作时出现的错误：

{{ DB::statement('select `comments`.`username` from `comments` inner join `threads` on `comments`.`tid` = `threads`.`tid` where `comments`.`deleted_at` is null and `threads`.`cid` = '. $categorie->id .' order by `comments`.`posted_at` desc limit 1') }}

{{Comment::join('threads', 'comments.tid', '=', 'threads.tid')->where('threads.cid', '=', $categorie->id)->orderBy('comments.posted_at', 'DESC')->limit(1)->pluck('username')}}

这只返回
1
，但我需要
用户名

当我这样做时：

{{ DB::statement('select `comments`.`username` from `comments` inner join `threads` on `comments`.`tid` = `threads`.`tid` where `comments`.`deleted_at` is null and `threads`.`cid` = '. $categorie->id .' order by `comments`.`posted_at` desc limit 1') }}

{{Comment::join('threads', 'comments.tid', '=', 'threads.tid')->where('threads.cid', '=', $categorie->id)->orderBy('comments.posted_at', 'DESC')->limit(1)->pluck('username')}}

错误：

SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'username' in field list is ambiguous (SQL: select `username` from `comments` inner join `threads` on `comments`.`tid` = `threads`.`tid` where `comments`.`deleted_at` is null and `threads`.`cid` = 3 order by `comments`.`posted_at` desc limit 1)

当我使用此选项时：

{{Comment::join('threads', 'comments.tid', '=', 'threads.tid')->where('threads.cid', '=', $categorie->id)->orderBy('comments.posted_at', 'DESC')->first()->pluck('username')}}

它不会返回任何错误，但也不会显示正确的值？
粘贴控制器和模型代码，以及如果您正在获取，您将获得的错误。我已更新我的问题。粘贴控制器和模型代码，以及如果您正在获取，您将获得的错误。我已更新我的问题。
{{Comment::join('threads', 'comments.tid', '=', 'threads.tid')->where('threads.cid', '=', $categorie->id)->orderBy('comments.posted_at', 'DESC')->first()->pluck('username')}}