new.rb

  def change_description(cl)
    Kernel.const_get(cl.model).describe_change(cl)
  end

old.rb

  def change_description(cl)
    if cl.event == "CREATE"
      desc = "Created #{cl.model.titleize}"

      if cl.model == "Activity"
        desc += " in Register \"#{h cl.register.name}\""

        if(cl.register.specific?)
          fac = cl.register.facilities.first
          if fac.name.blank?
            desc += " in Facility \"No Name\""
          else
            desc += " in Facility \"#{h cl.register.facilities.first.name}\""
          end
        elsif cl.register.shared?
          desc += " (Shared)"
        end

      end
    elsif cl.event == "UPDATE"
      if cl.model =~ /Activity/
#        desc = "Modified Activity in Register \"#{h cl.register.name}\""
        desc = "Activity \"#{h cl.activity.name}\", changed #{cl.field} from \"#{h cl.old_value}\" to \"#{h cl.new_value}\""
      else
        desc = "Changed #{cl.field} from \"#{h cl.old_value}\" to \"#{h cl.new_value}\""
      end
    end
    return desc
  end