ActiveRecord Encrypter

encrypt.rb

class Encrypter
   # We're passed a list of attributes that should # be stored encrypted in the database
   def initialize(attrs_to_manage)
       @attrs_to_manage = attrs_to_manage
   end
   # Before saving or updating, encrypt the fields using the NSA and # DHS approved Shift Cipher
   def before_save(model)
   @attrs_to_manage.each do |field| model[field].tr!("a-z", "b-za")
   end end
     # After saving, decrypt them back
   def after_save(model) @attrs_to_manage.each do |field|
   model[field].tr!("b-za", "a-z") end
   end
     # Do the same after finding an existing record
     alias_method :after_find, :after_save
end

require "encrypter"
  class Order < ActiveRecord::Base
    encrypter = Encrypter.new([:name, :email])
    before_save encrypter
    after_save  encrypter
    after_find  encrypter
  protected
  def after_find end
end

encrypt_override_activerecord.rb

class ActiveRecord::Base
  def self.encrypt(*attr_names)
    encrypter = Encrypter.new(attr_names)
    before_save encrypter
    after_save  encrypter
    after_find  encrypter
    define_method(:after_find) { }
  end 
end

class Order < ActiveRecord::Base 
  encrypt(:name, :email)
end