Trying to get 属性 author of non-object 错误，如何解决？

Question

已尝试按照本教程进行操作 Laravel show last reply left on post，一直有效，但现在 returns 在某些线程上出现此错误

Trying to get property 'author' of non-object (View: /var/www/html/web/resources/views/forums/board.blade.php)

这是我使用的代码：

  <h1>{{$board->name}}</h1>
  @auth
  <a role="button" href="{{route('forums.thread.create', $board->id)}}" class="btn btn-primary">Create Thread</a>
  @endauth

  @foreach($board->threads->sortByDesc('pinned') as $thread)
  <div class="thread-box {{$thread->pinned ? '' : 'bg-light'}} p-3 mt-3" style="background-color: #eee;">
    <a href="{{route('forums.thread.show', $thread->id)}}" class="text-decoration-none">
      <img src="{{$thread->author->avatar}}" alt="User Avatar" style="max-height: 40px;" class="rounded-circle">
      <span>
        {{$thread->name}}
      </span>
    </a>
    @if(!$thread->pinned)
    @else
    <div class=" d-inline lock">
      <i class="fas fa-thumbtack"></i>
    </div>
    @endif
    @if(!$thread->locked)
    @else
    <div class=" d-inline lock">
      <i class="fas fa-lock"></i>
    </div>
    @endif
    <hr>
    @if($thread->replies)<p>Last Update: <img src="{{$thread->replies->sortBydesc('id')->first()->author->avatar}}" alt="User Avatar" style="max-height: 40px;" class="rounded-circle"> <b>{{$thread->replies->sortBydesc('id')->first()->author->username}}</b></p>@else<p>No New Activity</p>@endif
  </div>
  @endforeach
</div>
@endsection

像我说的那样之前可以工作，但似乎不再工作了。有什么想法吗？

Answer 1

$thread->replies->sortBydesc('id')->first() 以某种方式没有返回您正在寻找的最新回复，即使您已经在 if 语句中检查了 $thread->replies。我会调试为什么无法检索线程的最新回复，或者只是在 if 语句中添加另一个条件来检查它。

@if($thread->replies && $thread->replies->sortBydesc('id')->first())
  <p>Last Update:
    <img src="{{$thread->replies->sortBydesc('id')->first()->author->avatar}}"
      alt="User Avatar" style="max-height: 40px;" class="rounded-circle">
    <b>{{$thread->replies->sortBydesc('id')->first()->author->username}}</b> 
  </p>
@else
  <p>No New Activity</p>
@endif

Trying to get 属性 author of non-object 错误，如何解决？

Trying to get property author of non-object error, how to fix it?

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