Laravel渴望加载多态关系 [英] Laravel Eager Loading Polymorphic Relationships

问题描述

试图急于加载模型及其相关模型，但是即使相关模型具有相关数据，相关模型也会返回null.

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

组模型与Game或Gamer的多态性为1:1.

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');
}

先查询要加载的组，然后再进行游戏:

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

组返回组，但游戏返回空值.

这是组"表的示例数据库条目:

id    subdomain    groupable_id    groupable_type
5     Starmade     10              Game

这是游戏"表的示例数据库条目:

id    genre    rating
10    7        4.5

不确定我要去哪里出错，没有游戏返回.

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

推荐答案

尝试一下.可能有帮助.

Try this. It might help.

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

我太早遇到了这个问题，也许你有和我一样的问题.本质上，我所做的是帮助Laravel查找需要查找的列.

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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