[英]Laravel 4, Multiple Polymorphic Relations from one Model
I'm trying to set up polymorphic relationships in Laravel 4 so that I can have one Image class which handles everything related to uploads, unlinks and so on, then have it used by multiple different Models. 我正在尝试在Laravel 4中设置多态关系,以便我可以拥有一个Image类来处理与上传,取消链接等相关的所有内容,然后由多个不同的模型使用它。 That's fine, until I get to trying to create multiple links from the same Model. 这很好,直到我尝试从同一个模型创建多个链接。
For example, I currently have something like this: 例如,我目前有这样的事情:
Models/Image.php 型号/ Image.php
class Image extends Eloquent {
public function of() { return $this->morphTo(); }
}
Models/Person.php 型号/ Person.php
class Person extends Eloquent {
public function mugshot() { return $this->morphOne('Image', 'of'); }
public function photos() { return $this->morphMany('Image', 'of'); }
}
Models/Place.php 型号/ Place.php
class Place extends Eloquent {
public function photos() { return $this->morphMany('Image', 'of'); }
}
Here, a Person can upload one mugshot
and many photos
, while a Place can have many photos
. 在这里,一个人可以上传一张mugshot
和许多photos
,而一个地方可以有很多photos
。 The problem is that when I create a mugshot
on a Person, it saves this into the images
table in the database: 问题是,当我在Person上创建一个mugshot
时,它会将其保存到数据库中的images
表中:
id: 1
of_id: 1
of_type: Person
It doesn't store the fact that it's a mugshot
and not a photo
, so when I go to retrieve it, $person->mugshot
may sometimes return one of $person->photos
and vice versa. 它没有存储它是一个mugshot
而不是photo
的事实,所以当我去取回它时, $person->mugshot
有时会返回$person->photos
$person->mugshot
$person->photos
,反之亦然。
Is there either (a) a better way to do this than creating 2 links on the same Model, or (b) a way to actually make this way work? 是否有(a)比在同一模型上创建2个链接更好的方法,或者(b)实际使这种方式有效的方法?
No built-in way right now. 现在没有内置方式。 Maybe in Laravel 4.1 that's supposed to bring a complete rewrite of polymorphic relations. 也许在Laravel 4.1中,它应该完全重写多态关系。
Add a type
property to Image
, then define where
conditions on the relations: a添加type
属性,以Image
,然后定义where
的关系条件:
public function mugshot() {
return $this->morphOne('Image', 'of')->where('type', 'mugshot');
}
public function photos() {
return $this->morphMany('Image', 'of')->where('type', 'photo');
}
Don't forget to set type
on Image
s you create. 不要忘记在您创建的Image
上设置type
。 Or, like I did bellow, hide that logic inside the model. 或者,就像我吼叫一样,将模型隐藏在模型中。
Here's my code (I'm using PHP 5.4 with short array notation): 这是我的代码(我使用的是带有短数组符号的PHP 5.4):
Image: 图片:
namespace SP\Models;
class Image extends BaseModel {
const MUGSHOT = 'mugshot';
const PHOTO = 'photo';
protected $hidden = ['type'];
public function of()
{
return $this->morphTo();
}
}
Person: 人:
namespace SP\Models;
use SP\Models\Image;
class Person extends BaseModel {
public function mugshot() {
return $this->morphOne('SP\Models\Image', 'of')
->where('type', Image::MUGSHOT);
}
public function photos() {
return $this->morphMany('SP\Models\Image', 'of')
->where('type', Image::PHOTO);
}
public function saveMugshot($image)
{
$image->type = Image::MUGSHOT;
$image->save();
$this->mugshot()->save($image);
}
public function savePhotos($images)
{
if(!is_array($images))
{
$images = [$images];
}
foreach($images as $image)
{
$image->type = Image::PHOTO;
$image->save();
$this->photos()->save($image);
}
}
}
Somewhere in a controller/service: 控制器/服务中的某个地方:
$person->savePhotos([$image1, $image2]);
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