state_machine rails 3.2.2

sm.rb

module EntryUtils
  module StateMachine
    extend ActiveSupport::Concern
    
    included do
      before_validation :ensure_default_state, :on => :create
      state_machine :initial => :created do

        before_transition any => [:published,:approved] do |entry, transition|
          if entry.content_empty?
            invalidate(entry, "change: ","You cannot #{transition.event} an empty #{entry.class.to_s}.")
            throw :halt
          end
        end

        event :publish do
          transition created: :published
          transition rejected: :published
        end
        event :approve do
          transition published: :approved
        end
        event :reject do
          transition published: :rejected
        end
        
        event :duplicate do
          transition approved: :created
        end
        
        after_transition any => :rejected do
        end
        
        after_transition approved: :created do |entry|
          entry.working_revision = entry.working_revision + 1
          entry.save(:validate => false)
        end

        # When approved, create a new version.
        after_transition any => :approved do |entry|
          entry.send :create_new_revision
          if entry.working_revision.to_i <= 1
            entry.categories.each{ |category| category.increment!(:entry_count) }
          end
        end

      end      
    end # end sm
    
  end
  
  ##
  # Makes sure the default state is always "created" and never nil
  # 
  def ensure_default_state
    self.state ||= "created" unless self.persisted?
  end
  
  
  # Ensures the requested state change can be performed before 
  # processing other validations
  # 
  def ensure_valid_transition
    self.class.state_machines.transitions(self, :save).perform
  end
  
end