如何使用activerecord获取最后N条记录? [英] How to get last N records with activerecord?

问题描述

使用 :limit 查询，我将获得前 N 条记录.获取最后 N 条记录的最简单方法是什么?

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

推荐答案

更新答案 (2020)

您只需使用 last 方法即可获取最后 N 条记录:

Updated Answer (2020)

You can get last N records simply by using last method:

Record.last(N)

示例:

User.last(5)

按 id 降序返回 5 个用户.

Returns 5 users in descending order by their id.

我认为这样的活动记录查询可以满足您的需求('Something' 是模型名称):

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

edit:如评论中所述，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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