code: def track_changes models, *args
        models_to_track = []
        models_to_track << models
        if args.kind_of?(Array)
          models_to_track << args
        end
        models_to_track.flatten!
  
        define_method(:__track_changes_to_models) { models_to_track }
  
        self.class_eval do
          helper :audits
          before_filter TrackChanges::CurrentUserFilter
        end
      end
docs: Sets up an around filter to assign the controller's <tt>current_user</tt>
   to the given model names that are already set as instance variables in a
   prior <tt>before_filter</tt>.
  
   Example:
  
    track_changes :post
    track_changes :post, :post_attribute
  
   Currently does not work if the instance variable is anything except
   an model that has <tt>current_user</tt> accessors.