Question

我想通过使用下面的sql获得查询结果：

select * 
from (select id, account_uuid, type, content, reference_id, messages.created_at as msg_time 
      from messages 
      where content IS NOT NULL 
      order by created_at desc) a 
inner join accounts 
on accounts.uuid = a.account_uuid 
group by a.account_uuid 
order by a.id desc;

我在grids / messages.rb中编写了一个范围：

class Messages
  include Datagrid
  scope do
    Account.group(:uuid).joins("select * from (select id, account_uuid, type, content, reference_id, messages.created_at as msg_time from messages where content IS NOT NULL order by created_at desc)")
            .order("message_id desc")
  end
end

我得到了sql语法错误（显然）。请告诉我如何将上面的sql转换为范围的某些代码。非常感谢！

Answer 1

我认为范围不适合您的代码使用。为方便起见，最好使用类方法。

如何在rails scope中编写原始sql？

1 个答案: