File: car.rb

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ruby-state-machine 1.2.0-2
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require 'state_machine'

class Car < Vehicle
  state_machine do
    event :reverse do
      transition [:parked, :idling, :first_gear] => :backing_up
    end
    
    event :park do
      transition :backing_up => :parked
    end
    
    event :idle do
      transition :backing_up => :idling
    end
    
    event :shift_up do
      transition :backing_up => :first_gear
    end
  end
end