如何获得最后的N条记录与ActiveRecord的？ [英] How to get last N records with activerecord?

问题描述

使用：限在查询中，我会第一个N个记录。什么是拿到最后的N条记录的最简单的方法？

With :limit in query, I will get first N records. What is the easiest way to get last N records?

推荐答案

像这样的活动记录查询我想你想要什么会让你（'东西'是型号名称）：

An active record query like this I think would get you what you want ('Something' is the model name):

Something.find(:all, :order => "id desc", :limit => 5).reverse

修改：正如评论指出，另一种方式：

edit: As noted in the comments, another way:

result = Something.find(:all, :order => "id desc", :limit => 5)

while !result.empty?
        puts result.pop
end

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