Laravel eloquent 查询与相关表的总和 [英] Laravel eloquent query with sum of related table

问题描述

我有一个表 users 和 posts，其中包含 user_id 和 post_views 列.在 post_views 中，我保留了帖子显示次数的信息.

I have a table users and posts with columns user_id and post_views. In post_views I keep information how many times post was display.

现在，在查询中，我希望获得用户的post_views他所有帖子的总和.

And now, in query I would like to get user with sum of post_views all his posts.

我尝试做这样的事情:

User::where(['id'=>$id])->with('posts')->get();

在我定义的模型中:

public function posts()
    {
        return $this->hasMany('AppModelsPost')->sum('post_views','AS','totalViews');
    }

但没有成功.

怎么做?

谢谢

推荐答案

您可以使用修改后的 withCount():

You can use a modified withCount():

public function posts()
{
    return $this->hasMany('AppModelsPost');
}

$user = User::withCount(['posts as post_views' => function($query) {
    $query->select(DB::raw('sum(post_views)'));
}])->find($id);
// $user->post_views

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