gistfile1.rb

  state_machine :state, initial: :opened do
    state :opened
    state :confirmed
    state :rejected
    state :closed

    event :confirm_it do
      # only user
      transition [:opened, :rejected] => :confirmed
    end

    event :unconfirm_it do
      # only user
      transition :confirmed => :opened
    end

    event :reject_it do
      # only admin
      transition [:opened, :confirmed] => :rejected
    end

    event :close_it do
      # only admin
      transition [:opened, :confirmed, :rejected] => :closed
    end

    after_transition :to => [:confirmed], :do => :set_confirmed
    after_transition :to => [:rejected], :do => :increment_rejected_count
  end