Chris@909: class Page < ActiveRecord::Base
Chris@909:   belongs_to :author
Chris@909:   has_many   :authors,  :through => :versions, :order => 'name'
Chris@909:   belongs_to :revisor,  :class_name => 'Author'
Chris@909:   has_many   :revisors, :class_name => 'Author', :through => :versions, :order => 'name'
Chris@909:   acts_as_versioned :if => :feeling_good? do
Chris@909:     def self.included(base)
Chris@909:       base.cattr_accessor :feeling_good
Chris@909:       base.feeling_good = true
Chris@909:       base.belongs_to :author
Chris@909:       base.belongs_to :revisor, :class_name => 'Author'
Chris@909:     end
Chris@909:     
Chris@909:     def feeling_good?
Chris@909:       @@feeling_good == true
Chris@909:     end
Chris@909:   end
Chris@909: end
Chris@909: 
Chris@909: module LockedPageExtension
Chris@909:   def hello_world
Chris@909:     'hello_world'
Chris@909:   end
Chris@909: end
Chris@909: 
Chris@909: class LockedPage < ActiveRecord::Base
Chris@909:   acts_as_versioned \
Chris@909:     :inheritance_column => :version_type, 
Chris@909:     :foreign_key        => :page_id, 
Chris@909:     :table_name         => :locked_pages_revisions, 
Chris@909:     :class_name         => 'LockedPageRevision',
Chris@909:     :version_column     => :lock_version,
Chris@909:     :limit              => 2,
Chris@909:     :if_changed         => :title,
Chris@909:     :extend             => LockedPageExtension
Chris@909: end
Chris@909: 
Chris@909: class SpecialLockedPage < LockedPage
Chris@909: end
Chris@909: 
Chris@909: class Author < ActiveRecord::Base
Chris@909:   has_many :pages
Chris@909: end