Laravel 渴望加载多态关系

Laravel Eager Loading Polymorphic Relationships(Laravel 渴望加载多态关系)

问题描述

尝试预先加载模型及其相关模型，但相关模型返回 null，即使它具有相关数据.

Trying to eager load a model and it's related model but the related model returns null even though it has related data.

组模型对 Game 或 Gamer 具有 1:1 的多态性.

组模型关系:

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

游戏模型关系:

public function group()
{
    return $this->morphOne('Group', 'groupable');
}

玩家模型关系:

public function group()
{
    return $this->morphOne('Group', 'groupable');
}

查询加载组然后游戏:

$group = Group::whereSubdomain($id)->first();
$game = $group->game;

组返回组，但游戏返回 null.

这是 Groups 表的示例数据库条目:

id    subdomain    groupable_id    groupable_type
5     Starmade     10              Game

这是 Games 表的示例数据库条目:

id    genre    rating
10    7        4.5

不知道我哪里错了没有游戏返回.

Not sure where I am going wrong to have no game returned.

推荐答案

试试这个.这可能会有所帮助.

Try this. It might help.

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

我之前也遇到过这个问题，也许你和我有同样的问题.基本上我所做的是帮助 Laravel 找到它需要查找的列.

I had that problem too earlier, maybe you have the same prob like me. Essentially what I did was to help Laravel finds what columns it needs to look up for.

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