Example of editing existing State Machine

gistfile1.rb

      # Adding a new state
      Order.state_machine.states << skrill_state = StateMachine::State.new(Order.state_machine, 'skrill')

      # Redefining an event
      Order.state_machine.events << next_event = StateMachine::Event.new(Order.state_machine, :next)
      next_event.transition :from => 'cart', :to => 'address'
      next_event.transition :from => 'address', :to  => 'delivery'
      next_event.transition :from => 'delivery', :to  => 'payment', :if => :payment_required?
      next_event.transition :from => 'payment', :to  => 'skrill', :if => lambda {true}
      next_event.transition :from => 'skrill', :to  => 'complete'
      next_event.transition :from => 'payment', :to  => 'confirm', :if => Proc.new { Gateway.current && Gateway.current.payment_profiles_supported? }
      next_event.transition :from => 'payment', :to  => 'complete'

      # Adding a tranisition
      Order.state_machine.before_transition :to => 'skrill', :do => Proc.new{ |order|
        skrill_account = SkrillAccount.find_or_create_by_email(order.email)

        payment = order.payments.create(
          :amount => order.total,
          :source => skrill_account,
          :payment_method => order.payment_method)

        payment.started_processing!
        payment.pend!

      }