我正在做一个拉拉维尔应用程序。在laravel中，我试图更新透视表中的一行。在此应用程序中，我有三个表:

问题：id,标题,描述

类别：id、名称

category_issues:(pivot table)id，issue_id，category_id

在laravel中，我试图更新透视表中的一行。我有以下关系:
issue.php

public function categories（）{
return$this->bongstomany('app\category','category_issues')；
}

category.php

public function issues（）{
return$this->bongstomany（“app\issue”,“category_issues”）；
}

一个问题可以有许多类别。

显示类别部分的Html代码：

<div class="form-group row">
                    <label for="category" class="col-md-4 col-form-label text-md-right">{{ __('Category :') }}</label>
                    <div class="form-check col-md-6">
                      @foreach ($categories as $category)

                        <input type="checkbox" name="category[]" id="{{ $category->id }}" value="{{ $category->id }}"
                        {{ in_array($category->id, $issue->categories->pluck('id')->toArray())  ? 'checked' : '' }}>

                        <label for="{{ $category->id }}"> {{ $category->name }} </label>
                      @endforeach
                    </div>
                  </div>

下面是更新函数文件：

public function update(Issue $issue)
{
  request()->validate([
      'title'=> ['required', 'min:3'],
      'description'=> ['required', 'min:3'],
      'category' => ['required']
    ]);
  $issue->title = request('title');
  $issue->description = request('description');
  $issue->save();

  //Category_Issue Update
    $categoryIssue = new CategoryIssue;
    $cats = request('category');

     foreach ($cats as $cat) {
       $categoryIssue->updateOrCreate([
         'issue_id'=> $issue->id,
         'category_id' => $cat
       ]);
     }
     return redirect('issues')->with('success', 'Issue has been updated');
}