LARAVEL：销毁和分离方法
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LARAVEL : Destroy and detach method
提问by Patrick Rey
I'm trying to delete a Poll with this function where I need to detach relations :
我正在尝试使用此功能删除一个 Poll，我需要在其中分离关系：
public function destroy($id)
{
$poll = Poll::findOrFail($id);
$poll->answers()->detach();
$poll->poll_user()->detach();
$poll->delete();
}
But I'm getting this error message, I don't know why :
但是我收到此错误消息，我不知道为什么：
Call to undefined method Illuminate\Database\Query\Builder::detach()
调用未定义的方法 Illuminate\Database\Query\Builder::detach()
Here is the Poll model :
这是民意调查模型：
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Poll extends Model
{
/**
* La table utilisée par le modèle
*
* @var string
*/
protected $table = 'polls';
/**
* On utilise les dates de mise à jour
*
* @var bool
*/
public $timestamps = true;
/**
* Attributs autorisés en ensignement de masse.
*
* @var array
*/
protected $fillable = ['question'];
/**
* Relation de type 1:n
*
* @return Illuminate\Database\Eloquent\Relations
*/
public function answers()
{
return $this->hasMany('App\Models\Answer');
}
/**
* Relation de type n:n
*
* @return Illuminate\Database\Eloquent\Relations
*/
public function users()
{
return $this->belongsToMany('App\Models\User')->withTimestamps();
}
}
回答by CUGreen
Try the following code:
试试下面的代码：
public function destroy($id)
{
$poll = Poll::findOrFail($id);
$poll->answers()->dissociate();
$poll->users()->sync([]);
$poll->delete();
}
If that doesn't work then might need to look at your other models or migrations.
如果这不起作用，那么可能需要查看您的其他模型或迁移。
回答by Patrick Rey
Well I don't know if it's correct or not but I've done the following and it works perfectly :
好吧，我不知道它是否正确，但我已经完成了以下操作并且效果很好：
public function destroy($id)
{
$poll = Poll::findOrFail($id);
$poll->answers()->delete();
$poll->users()->detach();
$poll->delete();
}
回答by 4lban
I suppose you set up connections in the right way in your models and I think you are trying to call this method in parent Controller (not in child Controller). Based on these this code should work...
我想您在模型中以正确的方式设置了连接，并且我认为您正试图在父控制器（而不是子控制器）中调用此方法。基于这些，这段代码应该可以工作......
public function destroy($id)
{
$poll = Poll::findOrFail($id);
foreach ($poll->answers as $answer)
{
$answer->poll()->dissociate();
$answer->save();
}
foreach ($poll->user as $user)
{
$user->poll()->dissociate();
$user->save();
}
$poll->delete();
}
回答by Houssine Sghaire
/**
* Removing an entity
*
* @param integer $id
* @return void
*/
public function destroy($id)
{
$this->getById($id)->users()->detach();
$this->getById($id)->answers()->delete();
$this->getById($id)->delete();
}
/**
* Getting an entity by id
*
* @param integer $id
* @return void
*/
public function getById($id)
{
return Poll::find($id);
}
