数据透视表返回空数组

Question

我正在尝试从数据透视表中获取数据（我有第三列）。但它返回空数组。当我做dd（）时我得到了这个

Collection {#323 ▼
  #items: []
}

$a = new Subject();
$authorized_users = $a->users()->get(['auth_teacher']);

模型

主题

public function users()
{
    return $this->belongsToMany('App\User')->withPivot('auth_teacher')->withTimestamps();
}

用户

public function subjects()
{
    return $this->belongsToMany('App\Subject')->withPivot('auth_teacher')->withTimestamps();
}   

编辑：错误编写的列名。我将其更改为正确但字符串仍为空

Answer 1

只需在模型上使用pivot关系。

$a = Subject::find(1);
foreach ($a->users as $user) {
    echo $user->pivot->auth_teacher;
}

https://laravel.com/docs/5.3/eloquent-relationships#many-to-many

在文档中查找＆＃34;检索中间表列＆＃34;

Answer 2

尝试以下代码：

$a = new Subject();
$authorized_users = $a->users()->find(['subject_id']);