Ruby add dynamic events using AASM
# game.rb
class Game
  include AASM

  aasm_initial_state :start
end

# add the require after the class definition, else it will complain of a missing constant
require "other_file"

# other_file.rb
Game.aasm_state :another_state
Game.aasm_event do
  transitions :to => :another_state, :from => [:start]
end