sql – Ruby on Rails中的单步批量删除

如何从Rake任务发送这样的查询到数据库服务器而不删除“每个”循环中的逐个记录？

delete from data
where uuid in (
    select uuid
    from data
    group by uuid,raw,recdate
    having count(*)>1
);

解决方法

ActiveRecord为您提供了delete_all方法.请注意,它不会调用destroy回调. http://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-delete_all