Php 在laravel中使用同步功能时无法删除数据
我正在做一个laravel应用程序。在laravel中,我试图从数据透视表中删除一行及其相关数据。在此应用程序中,我有三个表:Php 在laravel中使用同步功能时无法删除数据,php,laravel,eloquent,laravel-5.8,Php,Laravel,Eloquent,Laravel 5.8,我正在做一个laravel应用程序。在laravel中,我试图从数据透视表中删除一行及其相关数据。在此应用程序中,我有三个表: issues: id, title, description categories: id, name category_issues:(pivot table) id, issue_id, category_id 在laravel中,我试图从数据透视表中删除一行及其相关数据。我有这样的关系: Issue.php public function categorie
issues: id, title, description
categories: id, name
category_issues:(pivot table) id, issue_id, category_id
在laravel中,我试图从数据透视表中删除一行及其相关数据。我有这样的关系:
Issue.php
public function categories() {
return $this->belongsToMany('App\Category', 'category_issues');
}
Category.php
public function issues() {
return $this->belongsToMany('App\Issue', 'category_issues');
}
一个问题可以有许多类别
用于显示类别部分的Html代码:
<div class="form-group row">
<label for="category" class="col-md-4 col-form-label text-md-right">{{ __('Category :') }}</label>
<div class="form-check col-md-6">
@foreach ($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>
以下是删除功能文件:
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
$cats = request('category');
$issue->categories()->sync($cats);
return redirect('issues')->with('success', 'Issue has been updated');
}
public function destroy(Issue $issue)
{
$issue->categories()->delete();
return redirect('issues')->with('danger', 'Issue deleted');
}
必须使用detach()来删除数据透视表数据
$issue->categories()->detach();
查看此文档,研究之后,我发现将数据库模式更改为级联删除到子行是可行的。