如何查看日历邀请邮件中的ics文件？

在我的Invitation.ics文件中，我所看到的只是#<Icalendar::Calendar:0xb299a54>我尝试实现此链接的日历对象，但是我获得了与该对象相同的.ics文件。我是红宝石的新手。任何人都可以给我推荐一个更好的教程，有关如何发送Google日历，Outlook，ical的日历邀请。到目前为止，这是代码。

class MeetingNotification < ActionMailer::Base
  # include Icalendar
   def meeting_request_with_calendar
     mail(:to => "[email protected]", :subject => "iCalendar",
                  :from => "[email protected]") do |format|
       format.ics {
       ical = Icalendar::Calendar.new
       e = Icalendar::Event.new
       e.start = DateTime.now.utc
       e.start.icalendar_tzid="UTC" # set timezone as "UTC"
       e.end = (DateTime.now + 1.day).utc
       e.end.icalendar_tzid="UTC"
       e.organizer "[email protected]"
       e.uid "MeetingRequest"
       e.summary "Scrum Meeting"
       e.description <<-EOF
         Venue: Office
         Date: 16 August 2013
         Time: 10 am
       EOF
       ical.add_event(e)
       ical.publish
       ical.to_ical
       render :text => ical, :layout => false
      }
    end
  end