問題描述

在 Laravel 文檔中，有以下示例用于檢索 morphedByMany 關系，這是多對多的多態關系.

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

Laravel 多對多多態關系文檔

namespace App;

use IlluminateDatabaseEloquentModel;

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

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

我如何獲得一個查詢/集合中所有 morphed 關系的列表，例如 posts 和 videos，然后如果我后來添加了照片(或任何東西)，那也是?

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?

推薦答案

我在這里使用一個技巧:

I use a trick here:

為您的連接表 taggable 創建一個模型 Taggable 并添加一個 hasMany 關系到 Tag 模型.

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);
}

在你的 Taggable 模型中創建一個 morphedTo 關系.

Within your Taggable model create a morphedTo relation.

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

現在您可以通過調用獲取所有使用該標簽的模型:

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

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

這篇關于在 Laravel Eloquent 中檢索所有 morphedByMany 關系的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！