lesson_fsm.rb

aasm :column => :state do
    state :proposed, :initial => true
    state :cancelled
    state :accepted
    state :claimed
    state :submitted
    state :rejected
    state :updated
    state :approved
    state :published
    state :flagged
    state :revised
    state :retired

    event :cancel do
      transitions :from => [:accepted, :claimed, :submitted, :proposed, :updated], :to => :cancelled
    end

    event :accept do
      transitions :from => :proposed, :to => :accepted
    end

    event :claim do
      transitions :from => :accepted, :to => :claimed
    end

    event :submit do
      transitions :from => :claimed, :to => :submitted
    end

    event :reject do
      transitions :from => [:submitted, :updated], :to => :rejected
    end

    event :update do
      transitions :from => :rejected, :to => :updated
    end

    event :approve do
      transitions :from => [:submitted, :updated], :to => :approved
    end

    event :publish do
      transitions :from => :revised, :to => :published
      transitions :from => :approved, :to => :published
    end

    event :flag do
      transitions :from => :published, :to => :flagged
    end

    event :revise do
      transitions :from => :flagged, :to => :revised
    end

    event :retire do
      transitions :from => [:published, :flagged], :to => :retired
    end
  end