<p>我目前正在使用 Laravel 9 进行我的第一个实际项目。我遇到了一个无法解决的问题。我有两个表“类别”和“文章”，它们与字段 id（类别表）和category_id（文章表）连接。</p> <p>在我的 CategoryController 中：</p> <pre class="brush:php;toolbar:false;">public function categories(){ $categories = Category::all(); $articles = Article::all(); return view('category.categories')-&gt;with('cats',$categories)-&gt;with('arts',$articles); }</pre> <p>我的 Blade 视图设置如下：</p> <pre class="brush:php;toolbar:false;">&lt;ul&gt; @foreach($cats as $cat) &lt;li&gt;{{ $cat-&gt;name}} &lt;ul&gt; @foreach($arts as $art) @if($cat-&gt;id == $art-&gt;category_id) &lt;li&gt;{{ $art-&gt;title }}&lt;/li&gt; @else &lt;li&gt;No articles&lt;/li&gt; @endif @endforeach &lt;/ul&gt; &lt;/li&gt; @endforeach</pre> <p>当我签入时，我得到了这个</p> <pre class="brush:php;toolbar:false;">Category 1 Article title 1 No articles No articles No articles No articles Category 2 No articles Article title 2 No articles No articles No articles Category 3 No articles No articles Article title 3 No articles No articles Category 4 No articles No articles No articles Article title 4 No articles Category 5 No articles No articles No articles No articles No articles</pre> <p>我该如何解决这个问题，这样它只显示一次“类别 5 下没有文章”</p>

public function articles()
{
    return $this->hasMany(Article::class);
}

public function categories(){
    $categories = Category::with('articles')->get();
    return view('category.categories')->with('cats',$categories);
}

<ul>
  @foreach($cats as $cat)
    <li>{{ $cat->name}}</li>
    @if(empty($cat->articles))
      <li>No articles</li> 
    @else
      <ul>
        @foreach($cat->articles as $art)
          <li>{{ $art->title }}</li>
        @endforeach
      </ul>
    @endif
  @endforeach
</ul>