当我使用以下语法删除一行时:
$user->delete();
是否有一种方法来附加一个类型的回调,这样它就会自动这样做:
$this->photo()->delete();
最好是在模型类内部。
当我使用以下语法删除一行时:
$user->delete();
是否有一种方法来附加一个类型的回调,这样它就会自动这样做:
$this->photo()->delete();
最好是在模型类内部。
当前回答
我在《Laravel 8》中使用了这种方法:
public static function boot() {
parent::boot();
static::deleted(function($item){
$item->deleted_by = \Auth::id(); // to know who delete item, you can delete this row
$item->save(); // to know who delete item, you can delete this row
foreach ($item->photos as $photo){
$photo->delete();
}
});
}
public function photos()
{
return $this->hasMany('App\Models\Photos');
}
注意:在此语法中删除$user->photos()->delete();对我没用……
其他回答
注意:这个答案是为Laravel 3编写的。因此,在Laravel的最新版本中可能会或可能不会很好地工作。
在真正删除用户之前,您可以删除所有相关照片。
<?php
class User extends Eloquent
{
public function photos()
{
return $this->has_many('Photo');
}
public function delete()
{
// delete all related photos
$this->photos()->delete();
// as suggested by Dirk in comment,
// it's an uglier alternative, but faster
// Photo::where("user_id", $this->id)->delete()
// delete the user
return parent::delete();
}
}
希望能有所帮助。
我在《Laravel 8》中使用了这种方法:
public static function boot() {
parent::boot();
static::deleted(function($item){
$item->deleted_by = \Auth::id(); // to know who delete item, you can delete this row
$item->save(); // to know who delete item, you can delete this row
foreach ($item->photos as $photo){
$photo->delete();
}
});
}
public function photos()
{
return $this->hasMany('App\Models\Photos');
}
注意:在此语法中删除$user->photos()->delete();对我没用……
使用限制()
Laravel 7之后,有了新的foreignId()和constrained()方法来定义数据库中的关系约束。可以在这些方法上使用OnDelete()方法自动删除相关记录。
古老的风格
$table->unsignedBigInterer('user_id');
$table->foreign('user_id')
->references('id')
->on('users')
->onDelete('cascade');
新风格
$table->foreignId('user_id')
->constrained()
->onDelete('cascade');
在想要删除的模型上添加删除功能 定义模型的关系
例如在这个例子中:
/**
* @return bool|null
*/
public function delete(): ?bool
{
$this->profile()->delete();
$this->userInterests()->delete();
$this->userActivities()->delete();
$this->lastLocation()->delete();
return parent::delete();
}
用户模型中的关系为:
public function profile()
{
return $this->hasOne(Profile::class, 'user_id', 'id');
}
public function userInterests()
{
return $this->hasMany(userInterest::class, 'user_id', 'id');
}
public function userActivities()
{
return $this->hasMany(userActivity::class, 'user_id', 'id');
}
public function lastLocation()
{
return $this->hasOne(LastLocation::class, 'user_id', 'id');
}
这里有一些完美的解决方案。
# model
public function order_item_properties()
{
return $this->hasMany(OrderItemProperty::class, 'order_id', 'id');
}
public function order_variations()
{
return $this->hasMany(OrderItemVariation::class, 'order_id', 'id');
}
# controller
$order_item = OrderItem::find($request->order_id);
$order_item->order_item_properties()->delete();
$order_item->order_variations()->delete();
$order_item->delete();
return response()->json([
'message' => 'Deleted',
]);