Laravel 渴望加载多态关系
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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