Rails 4:如何访问ActiveRecord_Relation-Object的属性？

Question

我有一个国家模型和旅行笔记模型.一个国家有许多旅行记录,旅行记录属于一个国家.

在Rails控制台中:

 TravelNote.published.country(248)

[#<TravelNote id: 172, country_id: 248, status: 1, advice_against: 0, published_at: "2012-10-04 07:57:00", created_at: "2014-09-23 09:09:20", updated_at: "2014-09-23 09:09:20">]

TravelNote.published.country(248).published_at
NameError: undefined local variable or method `published_at' for #<Class:0x00000005a84968>

如何获取此对象的published_at属性？

Answer 1

TravelNote.published.country(248)

返回一个记录数组,所以你必须抓住数组的第一项:

TravelNote.published.country(248).first.published_at