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In all of the example code here and in the API you need to namespace the object like GCal4Ruby::Calendar instead of just Calendar. This documentation needs a lot of reformatting.



GCal4Ruby is a full featured wrapper for the google calendar API. GCal4Ruby implements all of the functionality available through the Google Calnedar API, including permissions, attendees, reminders and event recurrence.

Author and Contact Information

This branch was made by Matt Gornick ( to implement Google AuthSub into the original GCal4Ruby that was created and is maintained by {Mike Reich}[] and is licenses under the GPL v2. Feel free to use and update, but be sure to contribute your code back to the project and attribute as required by the license.


Example Application


GCal4Ruby has three major components: the service, calendar and event objects. Each service has many calendars, which in turn have many events. Each service is the representation of a google account, and thus must be successfully authenticated using valid Google Calendar account credentials.


Below are some common usage examples. For more examples, check the documentation.


  1. Authenticate service = service.authenticate("", "password")

  2. Authenticate with Google AuthSub # your authentication controller (example is index action in the home controller): scope = '' next_url = '' secure = false # set secure = true for signed AuthSub requests session = true @authsub_link = GData::Auth::AuthSub.get_url(next_url, scope, secure, session)

     # in your next_url controller as defined by your AuthSub link (in example would be the authenticated action)
     	@token = params[:token]
     client =
     client.authsub_token = params[:token] # extract the single-use token from the URL query params
     session[:token] = client.auth_handler.upgrade()
     client.authsub_token = session[:token] if session[:token]
     service.authsub_authenticate(session[:token], "")
  3. Get Calendar List calendars = service.calendars


All usages assume a successfully authenticated Service.

  1. Create a new Calendar cal =

  2. Find an existing Calendar cal = Calendar.find(service, "New Calendar", :first)

  3. Find all calendars containing the search term cal = Calendar.find(service, "Soccer Team")

  4. Find a calendar by ID cal = Calendar.find(service, id, :first)


All usages assume a successfully authenticated Service and valid Calendar.

  1. Create a new Event event = event.title = "Soccer Game" event.start = Time.parse("12-06-2009 at 12:30 PM") event.end = Time.parse("12-06-2009 at 1:30 PM") event.where = "Merry Playfields"

  2. Find an existing Event event = Event.find(cal, "Soccer Game", {:scope => :first})

  3. Find all events containing the search term event = Event.find(cal, "Soccer Game")

  4. Create a recurring event for every saturday event = event.title = "Baseball Game" event.where = "Municipal Stadium" event.recurrence = event.recurrence.start = Time.parse("13-06-2009 at 4:30 PM") event.recurrence.end = Time.parse("13-06-2009 at 6:30 PM") event.recurrence.frequency = {"weekly" => ["SA"]}

  5. Create an event with a 15 minute email reminder event = event.title = "Dinner with Kate" event.start = Time.parse("20-06-2009 at 5 pm") event.end = Time.parse("20-06-209 at 8 pm") event.where = "Luigi's" event.reminder = {:minutes => 15, :method => 'email'}

  6. Create an event with attendees event = event.title = "Dinner with Kate" event.start = Time.parse("20-06-2009 at 5 pm") event.end = Time.parse("20-06-209 at 8 pm") event.attendees => {:name => "Kate", :email => ""}