sql - Ruby on Rails 中的单步批量删除

Question

如何从 Rake 任务向数据库服务器发送这样的查询而不删除“每个”循环中的逐条记录？

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

Answer 1

ActiveRecord 有delete_all适合你的方法。请注意，它不会调用销毁回调。http://api.rubyonrails.org/classes/ActiveRecord/Relation.html#method-i-delete_all