在 Eloquent 中软删除多对多关系的支点

Question

有没有办法“软删除”多对多关系？我已经在我的数据透视表中添加了一个deleted_at 列，并且正在使用SoftDeletingTrait。但是当你detach这两个关系时，该行被完全删除。

我有表 clients、users 和 client_user。我希望不知何故，使用User::find($user_id)->detach($client_id) 不会真正删除数据透视行，而是将deleted_at 设置为当前时间戳。

然后在此之后继续，我不希望能够恢复软删除的项目。但是，此刻，即使我手动设置deleted_at的值，我仍然得到结果

Answer 1

DB::table('client_user')
                ->where('client_id', $client->id)
                ->where('user_id', $user->id)
                ->update(array('deleted_at' => DB::raw('NOW()')));

Answer 2

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\Relation;

class User extend Model
{

    public function clients(): Relation
    {
        return $this
            ->belongsToMany(
                Client::class,
                'client_user',
                'user_id',
                'client_id'
            )
            ->using(ClientUserPivot::class)
            ->wherePivot('deleted_at', null)
            // load pivot ID (otherwise deleted event won't fire)
            // load more pivot fileds if we need
            ->withPivot('id', 'is_enabled', 'extra') 
            ->withTimestamps();
    }

}

/* The Cilent model file, in a similar way */
namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\Relation;

class Client extend Model
{

    public function users(): Relation
    {
        return $this
            ->belongsToMany(
                User::class,
                'client_user',
                'client_id',
                'user_id'
            )
            ->using(ClientUserPivot::class)
            ->wherePivot('deleted_at', null)
            // load pivot ID (otherwise deleted event won't fire)
            // load more pivot fileds if we need
            ->withPivot('id', 'is_enabled', 'extra') 
            ->withTimestamps();
    }

}

/* The Pivot file */
namespace App\Models;

use Illuminate\Database\Eloquent\Relations\Pivot;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Database\Eloquent\SoftDeletes;

class ClientUserPivot extends Pivot
{
    use SoftDeletes;

    public $incrementing = true;

    protected $table = 'client_user';

    protected $dates = ['deleted_at'];

    public function client(): Relation
    {
        return $this->belongsTo(Client::class);
    }

    public function user(): Relation
    {
        return $this->belongsTo(User::class);
    }
}

/////////////////////////
// We can see that the Pivot class is extends Model class,
// it just use the AsPivot trait, set the $incrementing = false,
// and set the $guarded = [].

// So, we can run the methods of Model in Pivot entity, such as @delete.
// Working:
$user = User::find(1);
$client = $user->clients->firstWhere('id', $clientId);
if ($client) {
    $client->pivot->delete();
}

// Last:
// You may have seen that I added a 'is_enabled' field in the pivot table,
// I think it may better than SoftDeletes.

Answer 3

是的，您可以在数据透视表上进行软删除，您只需为它们提供自己的 id 和时间戳。这样“SoftDeletingTrait”就可以工作了。这有点棘手，但它对我有用。 编辑：

而且我也忘了提到你必须为数据透视表制作一个模型，正如上面有人告诉你的那样 =P 例如，你有一个信用额度，以及该信用额度的许多要求，用于许多credit_lines，但您想知道每行上的请求的状态，并且还从该信用额度中删除，而不是从其他信用额度中删除。

Table
credit_line
id
name
capital
[More columns]
Table
requirements (Documents and things that everybody uses)
id
name
[More columns]

Table (pivot)

credit_line_has_requirements
id <---- you need this...
timestamps <---- also this
status_id <---- declined, accepted etc... 
reason <---- a text description of why you declined or acepted the requeriment...

然后您使用该数据透视表为 CreditLineHasRequeriments 创建一个模型。

抱歉英语不好。