多态多对多关系 [英] Polymorphic many-to-many relation

问题描述

  $ photo =照片::寻找（1）; 
 $ photo-> articles（） - > attach（2）; 
  

像这样的东西不行，给出

错误：调用未定义的方法
Illuminate\Database\Query\Builder :: articles（）'

如何做到正确的方式？

模型

  class Tag扩展Eloquent 
 {
 public function articles（）
 {
 return $ this-> morphedByMany（'Article'，'taggable'） ; 
} 
 
 public function photos（）
 {
 return $ this-> morphedByMany（'Photo'，'taggable'）; 
} 
} 
 class Article Eloquent 
 {
 public function tags（）
 {
 return $ this-> morphToMany（' Tag'，'taggable'）; 
} 
} 
 
类照片扩展Eloquent 
 {
 public function tags（）
 {
 return $ this-> ; morphToMany（'Tag'，'taggable'）; 
} 
} 
  

解决方案

得到它的工作...基本上它是多态+多对多关系结合。我以为它不需要标签表。标签表用作枢轴表，标签是包含基于数据透视表（taggables表）连接模型的标签对象的表

I couldn't get related models in many-to-many polymorphic relation saved into database.

$photo = Photo::find(1);
$photo->articles()->attach(2);

something like this wouldn't work and gives

error: Call to undefined method Illuminate\Database\Query\Builder::articles()'

How to do it the right way?

Models

class Tag extends Eloquent
{
    public function articles()
    {
        return $this->morphedByMany('Article', 'taggable');
    }

    public function photos()
    {
        return $this->morphedByMany('Photo', 'taggable');
    }
}
class Article extends Eloquent
{
    public function tags()
    {
        return $this->morphToMany('Tag', 'taggable');
    }
}

class Photo extends Eloquent
{
    public function tags()
    {
        return $this->morphToMany('Tag', 'taggable');
    }
}

解决方案

Finally got it working... Basically it's polymorphism + many to many relationship combined. I thought it don't require tags table. Taggables table acts as pivot table and tags is the table which contains Tag objects that connect models based on pivot table (taggables table)

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