Rails ActiveRecord - 如何在两个日期之间获取记录

Question

我在数据库中有两个日期列 - from_date和to_date.

例:

• from_date:2012-09-10
• to_date:2012-09-30
• today:2012-09-13

如果today日期介于from_date和之间,我需要获取所有记录to_date.如何在SQL查询中执行此操作？

如果我已经加载了相应的记录,我可以很容易地决定,如果今天的日期介于from_date和之间to_date,但我不知道,如何直接从数据库中获取这些记录.

Answer 1

检查范围条件下的Rails指南:

Client.where(created_at: (Time.now.midnight - 1.day)..Time.now.midnight)

这将产生以下SQL:

SELECT * FROM clients WHERE (clients.created_at BETWEEN '2008-12-21 00:00:00' AND '2008-12-22 00:00:00')

Answer 2

data = ModelName.where("today >= from_date AND today <= to_date")

Answer 3

你可以像这样使用:

Data = Model.where("date(now()) between from_date and to_date")

Answer 4

data = ModelName.find(:all, :conditions => "today >= from_date and today <= to_date")

Answer 5

一种安全而简单的方法是：

Model.where(':date BETWEEN from_date AND to_date', date: Date.current)