app/models/enju_terminal.rb
class EnjuTerminal < ActiveRecord::Base
attr_accessible :checkouts_autoprint, :comment, :ipaddr, :manifestation_autoprint, :name, :reserve_autoprint
require 'resolv'
validates :ipaddr,
:uniqueness => true,
:presence => true,
:length => { :maximum => 15 },
:format => { :with => Resolv::IPv4::Regex }
end