Php 无法在我的laravel应用程序中操作透视表

new job.blade.php

<select class="js-example-basic-multiple categories  form-control" name="categories[]" style="width: 100%" multiple="multiple">
    <option value=""></option>
    @foreach($array['categories'] as $key => $category)
        <option value="{!! $category->id !!}">{!! $category->category_name !!}</option>
    @endforeach
</select>

public function categories() {
    return $this->belongsToMany('App\Category', 'category_job_post', 'category_id', 'job_post_id');
}

public function jobs() {
    return $this->belongsToMany('App\JobPost');
}

给我一个所选类别id的数组，例如：['1'，'2']

但当我尝试将其与pivot表同步时

$job->categories()->sync($request['categories']);

我犯了这个错误

SQLSTATE[23000]：完整性约束冲突：1452无法添加或 更新子行：外键约束失败 （

jobs\u网站

category\u job\u post

，约束

category\u job\u post\u category\u id\u foreign

外键（

category\u id

） 删除级联上的引用

category

（

id

）

category\u job\u post

（

category\u id

，

job\u post\u id

）值（11,1））

我的分类表中没有像11这样的id

JobPost.php

<select class="js-example-basic-multiple categories  form-control" name="categories[]" style="width: 100%" multiple="multiple">
    <option value=""></option>
    @foreach($array['categories'] as $key => $category)
        <option value="{!! $category->id !!}">{!! $category->category_name !!}</option>
    @endforeach
</select>

public function categories() {
    return $this->belongsToMany('App\Category', 'category_job_post', 'category_id', 'job_post_id');
}

public function jobs() {
    return $this->belongsToMany('App\JobPost');
}

Category.php

<select class="js-example-basic-multiple categories  form-control" name="categories[]" style="width: 100%" multiple="multiple">
    <option value=""></option>
    @foreach($array['categories'] as $key => $category)
        <option value="{!! $category->id !!}">{!! $category->category_name !!}</option>
    @endforeach
</select>

public function categories() {
    return $this->belongsToMany('App\Category', 'category_job_post', 'category_id', 'job_post_id');
}

public function jobs() {
    return $this->belongsToMany('App\JobPost');
}

---

您必须切换列名

public function categories() {
    return $this->belongsToMany('App\Category', 'category_job_post', 'job_post_id', 'category_id');
}