仅获取专利数据数据 child 关系中的数据为空？

Question

我有一个像下面这样的集合。我需要获取那些没有上传文档的用户。现在从关系中，我该如何获取这个？

[0] => Array
        (
            [id] => 2
            [user_id] => 8
            [referred_by] => 
            ........          

            [user_documents] => 
        )

    [1] => Array
        (
            [id] => 3
            [user_id] => 9
            [referred_by] => 
            [reference_id] => NM1100008
            .......                    

            [user_documents] => Array
                (
                    [id] => 1
                    [customer_id] => 3
                    [doc_type] => 1
                    [document] => N8xFORsPpkTayTQ9Ihyz0ly7QM62TJHxvHhSFQSN.png
                    [admin_comment] => 
                    [approve_status] => approve
                    [other_gov_id] => 
                    [doc_no] => 1
                    [created_at] => 2020-04-04 12:39:12
                    [updated_at] => 2020-04-06 13:57:01
                    [deleted_at] => 
                )

        )

我只想在 user_documents 为空时获取行。。获取那些没有上传文件到系统的用户。

[user_documents] => 

提前致谢。

Answer 1

根据您设置关系的方式，这样的事情应该可行：

User::doesntHave('documents')->get();

Answer 2

您可以使用 laravel querying-relationship-absence

$users= User::doesntHave('user_documents')->get();