<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(); $articles = Article::all(); return view('category.categories')->with('cats',$categories)->with('arts',$articles); }</pre> <p>我的 Blade 视图设置如下：</p> <pre class="brush:php;toolbar:false;"><ul> @foreach($cats as $cat) <li>{{ $cat->name}} <ul> @foreach($arts as $art) @if($cat->id == $art->category_id) <li>{{ $art->title }}</li> @else <li>No articles</li> @endif @endforeach </ul> </li> @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>