如何在 Laravel 的 hasManyThrough 关系中删除 laravel_through_key

Question

我有一个 hasManythrough 关系。如下：

public function contacts(){
    return $this->hasManyThrough(ContactContent::class, Content::class,"id",'as_parent_content_id','as_parent_content_id','id');
}
public function getSupportElementsAttribute(){
    return [
        "contacts" => $this->contacts,
        "documents" => $this->documents,
        "assignments" => $this->assignments
    ];
}

这个返回是这样的：

"contacts": [
                {
                    "id": 66,
                    "as_parent_content_id": 5074,
                    "created_at": "2020-09-30 16:21:11",
                    "updated_at": "2020-09-30 16:21:11",
                    "create_user_id": 1,
                    "laravel_through_key": 5074
                }
            ],

如何删除这个 laravel_through_key ？

Answer 1

您可能想从集合中隐藏此列吗？然后 ：

$user = User::with('posts')->get();
$user->makeHidden('laravel_through_key');

现在laravel_through_key将从您的收藏中隐藏。

替代解决方案：添加laravel_through_key模型的$hidden属性，如：

protected $hidden = [
    'laravel_through_key'
];

Answer 2

您可以向模型添加受保护的属性

参考链接https://laravel.com/docs/8.x/eloquent-serialization#hiding-attributes-from-json

  /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
       'laravel_through_key'
    ];

或者你可以使用 makeHidden()

参考链接https://laravel.com/docs/8.x/eloquent-collections#method-makeHidden

public function getSupportElementsAttribute(){
    return [
        "contacts" => $this->contacts->makeHidden('laravel_through_key'),
        "documents" => $this->documents,
        "assignments" => $this->assignments
    ];
}