Question

如何在使用预先加载查询时选择父表上的某些列？

$accounts = \App\Account::with('status')->get();

返回

[{"id":1,"username":"kuhn.desiree","email":"quentin.gleason@example.net","last_login":"2009-04-02 23:21:20","created_at":"2017-07-15 19:07:03","updated_at":"2017-07-15 19:07:03","status_id":13,"status":{"id":13,"name":"ab","desc":"Quos quas.","created_at":"2017-07-15 19:07:01","updated_at":"2017-07-15 19:07:01"}}]

我只希望username表上有email和Account。

Answer 1

尝试使用此代码：

$accounts = \App\Account::with(['status' => function($q)
            {
                $q->select('username', 'email');
            }])->get();

Answer 2

您想添加一个选择呼叫：

$accounts = \App\Account::with('status')->select('username', 'email')->get();

Answer 3

一种方法是使用select()方法

$accounts = \App\Account::with('status')->select('username', 'email','status_id')->get();

如果要检索包含单个列值的Collection，可以使用pluck方法。：

accounts = \App\Account::with('status')->pluck('username', 'email');

Laravel Eloquent - 选择某些列与Eager Loading相结合

3 个答案: