laravel 如何删除 Eloquent 中的多态关系？
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How to remove a polymorphic relation in Eloquent?
提问by user2847910
I have a model like this:
我有一个这样的模型：
<?php
class Post extends Eloquent {
protected $fillable = [];
public function photos()
{
return $this->morphMany('Upload', 'imageable');
}
public function attachments()
{
return $this->morphMany('Upload', 'attachable');
}
}
and my morphManytable's schema is like this:
我的morphMany表的架构是这样的：
CREATE TABLE `uploads` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`raw_name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`size` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`downloads` int(11) NOT NULL DEFAULT '0',
`imageable_id` int(11) DEFAULT NULL,
`imageable_type` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
`attachable_id` int(11) DEFAULT NULL,
`attachable_type` varchar(32) COLLATE utf8_unicode_ci NOT NULL,
`user_id` int(10) unsigned NOT NULL,
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`id`),
KEY `uploads_user_id_index` (`user_id`),
CONSTRAINT `uploads_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `posts` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=45 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
now I need to remove one row of this table, I tried $posts->photos()->delete();but it removed all rows associated to this Post.
现在我需要删除此表的一行，我尝试过，$posts->photos()->delete();但它删除了与此相关联的所有行Post。
Could someone help me?
有人可以帮助我吗？
回答by patricus
$posts->photos()is the relationship query to return all of the photos for a post. If you call delete()on that, it will delete all of those records. If you only want to delete a specific record, you need to make sure you only call delete on the one you want to delete. For example:
$posts->photos()是返回帖子的所有照片的关系查询。如果您调用delete()它，它将删除所有这些记录。如果您只想删除特定记录，则需要确保只对要删除的记录调用 delete。例如：
$posts->photos()->where('id', '=', 1)->delete();
回答by vahiiiid
to reomove from pivot table in many to many polymorphic relation just use detach:
要从多对多多态关系中的数据透视表中删除，只需使用分离：
$posts->photos($photoModel)->detach();
回答by lukasgeiter
The relationship isn't even needed for this. Just use the Upload model directly:
甚至不需要这种关系。直接使用 Upload 模型即可：
Upload::find($id)->delete();
Or even shorter:
或者更短：
Upload::destroy($id);
回答by MP-programming
I would use the detach method to remove the relationship like so:
我会使用 detach 方法来删除关系，如下所示：
$post = Post::find($id);
$post->photos()->detach();
