比较Rails中的日期时间变量 [英] Comparing datetime variables in Rails

问题描述

Rails 3 Ruby 1.92 - 我有一个帮助方法来比较对象上的datetime属性与当前日期&时间。

Rails 3 Ruby 1.92 - i have a helper method comparing a datetime attribute on an object to the current date & time.

module StoreHelper
  def initial_time(product)
    if product.time_type == "Min"
      initial_time = (product.time * 60) 
    elsif product.time_type == "Hrs"
      initial_time = (product.time * 3600)
    else
      initial_time = 0
    end
  end

  def time_based_price(product)
    start_time = product.start_time
    current_time = Time.now
    expire_time = start_time + initial_time(product)

    if (current_time <= expire_time) && (unit_sales(product)>= product.volume)
      time_based_price = (product.price - product.boost_savings)
    else
      time_based_price = product.price
    end
  end
end

当我从我的视图中调用它时，我会收到错误undefined methodto_datetime '为0：Fixnum。如果我将比较行（current_time< = expire_time）更改为（expire_time> = current_time），我会收到错误Fixnum与Time failed的比较

when i call it from my view i get error "undefined method `to_datetime' for 0:Fixnum". if i change the comparison line (current_time <= expire_time)to (expire_time >= current_time) i get error"comparison of Fixnum with Time failed"

使用.now，.current，.zone.now为Time和DateTime，没有运气。当我从我的观点调用Time.zone.now和expire_time值时，它们具有相同的格式：

I've tried using .now, .current, .zone.now for both Time and DateTime with no luck. When i call the Time.zone.now and expire_time values from my view they have the same format:

   2013-11-17 20:48:07 UTC - Time.zone.now
   2013-11-17 16:15:00 UTC  - expire_time

推荐答案

您是否在列表中为每个产品项目调用此方法？在这种情况下，看起来像一个产品，没有为start_time和time_type设置任何值。当expire_time为0时，您会收到此错误。但是，由于您已尝试过expire_time的值，所以我认为它必须发生在更多的产品实例上，并且对于其中一个实例而言它将失败。

Are you calling this method for each product item in a list? In that case, looks like for one of the product, no values have been set for start_time, and time_type. You would get this error when expire_time is 0. But since you have tried the value of expire_time, I believe it must be happening for more product instances and it fails for one of those.

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