如何将 SQL 查询编写为 named_scope？

【问题标题】：How to write SQL query as named_scope?如何将 SQL 查询编写为 named_scope？
【发布时间】：2010-05-01 11:10:52
【问题描述】：

如何将以下 SQL 查询转换为 named_scope？

select users.*, sum(total_quantity * total_price) as points_spent 
from orders 
join users on users.id = orders.user_id 
where pay_type = 'points' 
group by user_id 
order by points_spent desc

谢谢！

【问题讨论】：

标签： sql ruby-on-rails

【解决方案1】：

试试这个

class User < ActiveRecord::Base

    named_scope :your_name, 
                :select=>" users.*,sum(total_quantity * total_price) as points_spent",       
                :joins => :orders, 
                :conditions => ['pay_type = ?', 'points'], 
                :group ="user_id ", 
                :order=>'points_spent desc'

end

【讨论】：