我如何才能找到从今天开始，昨天的记录等都与Ruby on Rails的？ [英] How can I find records from today, yesterday and so on with Ruby on Rails?

问题描述

我想找到的所有记录，说的帖子，今天创建了Ruby on Rails的，那么所有的帖子在昨天，等等......我应该怎么办？

I want to find all records, say Posts, created today with Ruby on Rails, then all Posts created yesterday, and so on… how should I do?

感谢您，

凯文

推荐答案

试试这个：

#Today
Posts.find(:all, conditions: { :created_at => Date.today...Date.today+1 })
#Yesterday
Posts.find(:all, conditions: { :created_at => Date.today-1...Date.today })

或者，这（preferable，在我看来）：

Or this (preferable, in my opinion):

#Today
Posts.find(:all, conditions: ["DATE(created_at) = ?", Date.today] )
#Yesterday
Posts.find(:all, conditions: ["DATE(created_at) = ?", Date.today-1] )

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