composed_of & fields_for

So I have read & re-read the Stephen Chu article on the topic (http://www.stephenchu.com/2008/05/rails-composedof-validation.html), however I am just not having any luck.

Per the example on provided in the money gem documentation money.rubyforge .org

Model

class Payment < ActiveRecord::Base
  composed_of :amount,
    :class_name => "Money",
    :mapping => [%w(cents cents), %w(currency currency_as_string)],
    :constructor => Proc.new { |cents, currency| Money.new(cents || 0, currency || Money.default_currency) }
end

Nice skinny controller

class PaymentsController < ApplicationController
  def create
    @payment = Payment.new(params[:payment])
    ...
  end
end

View (HAML)

- form_for @payment do |p|
  - p.fields_for :amount, @payment.amount do |a|
    = a.label :cents
    = a.text_field :cents
    = a.label :currency
    = a.text_field :currency, :value => :usd

The error I receive is: undefined method `cents' for {"cents"=>"6.66", "currency"=>"usd"}:HashWithIndifferentAccess

The 'amount' hash is being passed into composed_of as 'cents', but according to the article, it should use the attributes of 'amount' in params from the form. I'm just really stuck :/

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composed_of & fields_for

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