Google Calendar iCal parser demo for Rails

gistfile1.rb

#requires the following gems: net/http, chronic, icalendar, ice_cube 
#for ice_cube, I had to use a branch that had not yet been pulled into master.  
#In gemfile: gem 'ice_cube', :git => 'https://github.com/spra85/ice_cube.git'
class LibraryHoursCalendarBuilder
  
  def get_hours
    @calendars = LibraryHoursCalendar.all.order( "sort_order ASC" )
    @calendars.each do |calendar|
      
      #For each calendar, get the ical file from Google and parse it
      require 'net/http'
      ical =  Net::HTTP.get( URI( calendar.ical_url ) )
      ical_contents = Icalendar.parse( ical )
      ical_calendar = ical_contents.first
      ical_calendar.events.each do |event|

        schedule = IceCube::Schedule.new( event.dtstart.to_date )
        if event.rrule[0].blank?
          occurrences = [ event.dtstart ]
        else
          schedule.add_recurrence_rule( IceCube::Rule.from_ical( event.rrule[0].value_ical ) )
          if !event.exdate.blank?
            event.exdate.each do |exdate|
              schedule.add_exception_time( exdate.to_time )
            end
          end
          occurrences = schedule.occurrences( Time.now + 1.year )
        end
        
        #For all the occurrences of a calendar event (as defined in the RRULE recurrence rule),
        #create/update an entry in the database.
        occurrences.each do |occurrence|
          
          #First look to see if this date already exists for the calendar and try to update it
          calendar_entry = LibraryHoursCalendarEntry.find_by( :entry_date => occurrence.to_date, :calendar_id => calendar.id)

          #If this date doesn't exist, create a new entry
          if calendar_entry.blank?
            calendar_entry = LibraryHoursCalendarEntry.new
            calendar_entry.entry_date = occurrence.to_date
            calendar_entry.calendar_id = calendar.id
          end

          #Update the entry if it has changed or if this is a new record
          if calendar_entry.entry_content != event.summary or calendar_entry.new_record?

            calendar_entry.entry_content = event.summary.to_s

            entry_times = event.summary.split( "to" )
            if entry_times.length > 1 and !event.summary.downcase.include? "closed"

              calendar_entry.open_time = Chronic.parse( occurrence.to_date.to_s + " " + entry_times[0] )
              calendar_entry.close_time = Chronic.parse( occurrence.to_date.to_s + " " + entry_times[1] )

            else

              calendar_entry.open_time = nil
              calendar_entry.close_time = nil

            end

            #Save the entry
            calendar_entry.save

          end

        end

      end
    
    end
  end
  
end