laravel查询多对多

Posted 2021-04-28

我有2个模型，Service和Category。它们与多对多关系相关，如下所示：

Service.php

public function categories()
{
   return $this->belongsToMany('AppCategory')->withTimestamps();
}

Category.php

public function services()
{
   return $this->belongsToMany('AppService')->withTimestamps();
}

当然还有一个数据透视表：

category_service

  - category_id
  - service_id
  - created_at
  - updated_at

我想使用本地范围根据类别ID过滤服务结果。我已经完成以下工作：

Service.php

public function scopeFilter($query, $category_ids)
{
    $services = Service::whereHas('categories', function (Builder $query) use ($category_ids) {
        $query->whereIn('category_id', $category_ids)->get();
    });

    return $services;
}

但是我遇到了Column not found错误，具体是：

Column not found: 1054 Unknown column 'services.id' in 'where clause' (SQL: select * from `categories` inner join `category_service` on `categories`.`id` = `category_service`.`category_id` where `services`.`id` = `category_service`.`service_id` and `category_id` in (1, 2))

1和2是我通过的类别ID。

我根据发现的here和here的答案编写了该函数。

任何指针？

答案

将->get()放在封口之外。

public function scopeFilter($query, $category_ids) { $services = Service::whereHas('categories', function (Builder $query) use ($category_ids) { $query->whereIn('category_id', $category_ids); })->get(); return $services; }