在Laravel Eloquent中检索所有morphBy​​Many关系 [英] Retrieving all morphedByMany relations in Laravel Eloquent

问题描述

在Laravel文档中，有以下示例检索 morphedByMany 关系，它们是多对多多态关系。

In the Laravel documentation, there is the following example for retrieving morphedByMany relations, which are many-to-many polymorphic relations.

Laravel多对多多态关系文档

namespace App;

use Illuminate\Database\Eloquent\Model;

class Tag extends Model
{
    /**
     * Get all of the posts that are assigned this tag.
    */
    public function posts()
    {
        return $this->morphedByMany('App\Post', 'taggable');
    }

    /**
     * Get all of the videos that are assigned this tag.
     */
    public function videos()
    {
        return $this->morphedByMany('App\Video', 'taggable');
    }
}

我将如何获取所有<$ c的列表在一个查询/集合中，$ c>变形的关系，例如，帖子和视频 ，然后再添加张照片（或其他任何东西），也是吗？

How would I get a list of all morphed relations in one query / collection, for instance, posts and videos, and then if I later added photos (or anything), that too?

推荐答案

我在这里使用一个技巧：

I use a trick here:

为连接表<$ c $创建模型 Taggable c>可标记，并向 Tag 模型添加 hasMany 关系。

Create a Model Taggable for your connection table taggable and add a hasMany relation to the Tag model.

public function related()
{
    return $this->hasMany(Taggable::class);
}

在您的可标记中模型创建 morphedTo 关系。

Within your Taggable model create a morphedTo relation.

public function taggables()
{
    return $this->morphTo();
}

现在，您可以通过调用以下命令获取所有正在使用该标签的模型：

Now you can get all models witch are using the tag by calling:

$tagged = Tag::with('related.taggables');

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