Laravel 从关系的关系 table 和 select 列获取数据？

Question

我有 3 table

用户Table

+----+-------+----------+
| id | email | password |
+----+-------+----------+
| 1  | 1     | John     |
+----+-------+----------+

user_details Table

+----+--------------------+------------+-----------+
| id | user_id [FK_users] | first_name | last_name |
+----+--------------------+------------+-----------+
| 1  | 1                  | John       | Kevin     |
+----+--------------------+------------+-----------+

帖子Table

+----+--------------------+----------+
| id | user_id [FK_users] | title    |
+----+--------------------+----------+
| 1  | 1                  | 1st Post |
+----+--------------------+----------+

现在我已经在模型中创建了所有关系，现在我可以通过下面的方式访问 user_details table eloquent 查询它 returns 整个用户 table 和 user_details table 但我只想从 user_details table select first_name 和 last_name 我该怎么做？

$posts= Post::with('city:id,name_en', 'user.userDetail')->where('id', $id)->get();

Answer 1

这将获取所有 'post' 属性，'user' id，'user_details' user_id, first_name, last_name

$posts= Post::with([
    'city:id,name_en',
    'user' => function ($query) {
        $query->select('id');
    },
    'user.userDetail' => function($query) {
        $query->select(['user_id', 'first_name', 'last_name']);
    }
])->where('id', $id)->get();

Laravel 从关系的关系 table 和 select 列获取数据？

Laravel Get data from relationship's relationship table and select column?

php

laravel

eloquent

laravel-5.7