如何使用Rails3语法编写此MySql查询？

Question

SELECT  `subscriptions`.*, DATE_ADD(`subscriptions`.created_at, INTERVAL `packages`.validity DAY) as end_date
     FROM  `subscriptions`  INNER JOIN `packages` ON `packages`.`id` = `subscriptions`.`package_id`
    order by end_date;

Answer 1

假设您有一个模型Subscription，它是ActiveRecord :: Base的子类 然后它只是

Subsccription.select（“subscriptions。*，DATE_ADD（subscriptions。created_at，INTERVAL packages。validity DAY）as end_date）.joins（：packages）.order（：end_date ）

我可能有一些语法错误，例如它可能是：package not：packages。但基本