查询rails中的日期范围

时间:2012-10-08 15:41:08

标签: ruby-on-rails ruby-on-rails-3 activerecord timezone

我有一个范围可以查询今天的电话。基于范围,我用它来计算今天的通话量。

我的日期以UTC格式存储,但rails会转换为我当地的时区。我要做的是在今天00:00到23:59之间找到所有电话。

范围:

scope :today, where("DATE(transfer_date) BETWEEN ? AND ?", Time.zone.now.utc.beginning_of_day, Time.zone.now.utc.end_of_day)

irb输出:(由于UTC而捕获的呼叫)

irb(main):010:0> Call.last.transfer_date
  Call Load (0.9ms)  SELECT "calls".* FROM "calls" ORDER BY "calls"."id" DESC LIMIT 1
=> Sun, 07 Oct 2012 19:45:00 CDT -05:00
irb(main):011:0> 

irb(main):011:0> Call.last.transfer_date.utc
  Call Load (1.3ms)  SELECT "calls".* FROM "calls" ORDER BY "calls"."id" DESC LIMIT 1
=> 2012-10-08 00:45:00 UTC

我正试图弄清楚如何只查询今天00:00到23:59之间的通话。到目前为止尝试使用和不使用utc,zone等的范围都不起作用。它一直根据UTC提取范围,其中包括昨天的呼叫(昨天如果用当地时区格式化的话)。

如何在两次之间进行查询以获得正确的输出?我有点迷失在这里。

3 个答案:

答案 0 :(得分:17)

您可以使用专属范围。

scope :today, where(:transfer_date => Date.today...Date.tomorrow)

答案 1 :(得分:7)

我能够通过重写我的范围来补偿UTC,如下所示:

scope :today, where("transfer_date BETWEEN ? AND ?", Time.zone.now.beginning_of_day, Time.zone.now.end_of_day)

答案 2 :(得分:0)

也许这有点矫枉过正,但我​​建议使用辅助方法来获取时间范围,然后查询数据库。像

这样的东西
# Gets time range for x number timeunits ago
  def time_range(unit, timeunit = nil)
    if timeunit == "weeks"
      now = Time.zone.now.beginning_of_week
    elsif timeunit == "months"
      now = Time.zone.now.beginning_of_month
    else
      now = Time.zone.now.beginning_of_day
    end
    # Ex: time_range(0, "days") --> Get the time range for today  between the beginning of today and the beginning of tommorow - 1 second
    now - unit.send(timeunit)..now + 1.send(timeunit) - 1.seconds - unit.send(timeunit)
  end

将帮助您请求时间范围。所以,当你要求类似的东西时,

time_range(0, "days")

它将返回0天前(今天)的时间范围;

Wed, 07 Sep 2016 00:00:00 UTC +00:00..Wed, 07 Sep 2016 23:59:59 UTC +00:00

然后您可以简单地查询数据库对象并使用;

计算范围内的所有内容
Calls.where(transfer_date: time_range(unit, timeunit)).count