RoR: cannot get started with ezcrypto / ActiveCrypto

I want to encrypt a field stored in an ActiveRecord table. A few helpful people pointed me towards ezcrypto which appears to be what I want. Especially interesting is ActiveCrypto, as described in ezcrypto.rubyforge.org/files/README_ACTIVE_CR开发者_开发百科YPTO.html

But I can't get it working. I've added

gem 'ezcrypto', '0.7.2'

to my Gemfile, run bundle install, and extended my User model with:

require 'ezcrypto'
class User < ActiveRecord::Base
  ...
  keyholder
  ...
end

but that dies with undefined local variable or method 'keyholder'.

Ideas on how to get this working? TIA.

While I was digging around for an answer, I came upon attr_encrypted, which

• is actively supported
• does what I need
• worked the first time

So I don't need an answer to the OP (unless you feel compelled to do so...). Hope this helps someone else.