Using the iCalendar ruby library (gem install icalendar):
From the Show model, I added a method to create an event:
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class Show < ActiveRecord::Base ... def to_ical_event event = Icalendar::Event.new event.dtstart = time ? time.to_datetime : date event.dtstamp = created_at.to_datetime event.summary = "The title" event.description = "The description" event.uid = "show-#{id}" end end |
dtstarttakes a Date or DateTime object (see Ruby cookbook recipe chapter 3.9 for to_datetime method).
From the Venue model, I added a method to create the calendar and add all the show events:
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class Venue < ActiveRecord::Base has_many :shows ... def to_ical ical = Icalendar::Calendar.new ical.product_id = "-//dclicio.us//iCal 1.0//EN" ical.custom_property("X-WR-CALNAME;VALUE=TEXT", name) ical.custom_property("X-WR-TIMEZONE;VALUE=TEXT", "US/Eastern") shows.each do |show| event = show.to_ical_event ical.add_event(event) end ical end end |
- The
X-WRcustom properties are read by iCal and by google calendar.
Then a task to iterate through the venues creating the ics files:
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Venue.find(:all, :include => [ :shows ]).each do |venue| ical = venue.to_ical file = File.new("/tmp/#{venue.name}.ics", "w") file.write(ical.to_ical) # Allow myself to ... introduce ... myself :/ file.close end |
An ics file looks like:
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BEGIN:VCALENDAR X-WR-CALNAME;VALUE=TEXT:Black cat VERSION:2.0 CALSCALE:GREGORIAN PRODID:-//dclicio.us//iCal 1.0//EN X-WR-TIMEZONE;VALUE=TEXT:US/Eastern BEGIN:VEVENT UID:dclicio.us-243 DESCRIPTION:with nhttp://dclicio.us SUMMARY: DTSTART:20070117 DTSTAMP:040425 SEQ:0 END:VEVENT END:VCALENDAR |
I then surface these files in public/ical/ and add a ProxyPass /ical ! so apache can serve em up straight without hitting mongrel.
Check out dclicio.us to see it in action.
