ticket_factory_2.rb

class TicketFactory
  TICKET_CLASSES = {
    'Truck' => TruckParkingTicket,
    'Matatu' => MatatuParkingTicket,
    'Public Bus' => PublicBusParkingTicket
  }

  def self.ticket_for opts
    # .fetch takes a second argument as a default if the 
    # key is not found
    TICKET_CLASSES.fetch(opts[:vehicle_type], ParkingTicket).new(opts)
  end
end