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itinerary.rb #
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class Itinerary < ActiveRecord::Base
  has_many :events
  
  def duration
    # ... omitted for clarity
  end
  
  def visited_ports
    # ... omitted for clarity
  end
  
  def define(&block)
    instance_eval(&block)
  end
  
  private
  
  def depart(port, time_spec)
    build_itinerary_event('D', port, time_spec)
  end
  
  def arrive(port, time_spec)
    build_itinerary_event('A', port, time_spec)
  end
  
  def build_itinerary_event(code, port, time_spec)
    events.build(:code => code, :port => port, 
      :event_date => Chronic.parse(time_spec))
  end
end