Problem with reform from_hash method missing for a nested model.

models.rb

class ExtraUserInformation < ActiveRecord::Base
  belongs_to :user
  has_one :credit_card
  has_one :billing_address, :class_name => "Address"
  has_one :shipping_address, :class_name => "Address"
  attr_accessible :billing_address, :credit_card, :company, :customer_code, :email, :fax, :first_name, :last_name, :phone, :shipping_address, :website
end


class Address < ActiveRecord::Base
  belongs_to :extra_user_information
  attr_accessible :address_code, :country_code, :locality, :postal_code, :region, :street1, :street2
end


class CreditCard < ActiveRecord::Base
  belongs_to :extra_user_information
  attr_accessible :code
end


class Subscription < ActiveRecord::Base
  belongs_to :user
  attr_accessible :end_date, :start_date, :transaction_code, :customer_code, :premium_plan, :user
  validates :start_date, :transaction_code, :customer_code, :premium_plan, :user, :presence => true

  def self.latest
    order('start_date DESC').first
  end

  def active?
    end_date.nil? || end_date > Date.today
  end
  
  def deactivate
    self.end_date = Date.today
    save!
  end

end


class PremiumReward < ActiveRecord::Base
  belongs_to :user
  attr_accessible :customer_code             # code for this user from payment gateway
  attr_accessible :transaction_code            # code for this transaction from payment gateway
  attr_accessible :gift_info                   # yaml-ized string of gift info (i.e., price, variant, count, etc)
  attr_accessible :purchase_date               # date of the transaction
  attr_accessible :sent_date                   # date the item was sent to the user
end

SubscriptionForm.rb

class SubscriptionForm < Reform::Form

  property :extra_user_information do
    property :first_name, :on => :extra_user_information
    property :last_name, :on => :extra_user_information
    property :email, :on => :extra_user_information
    property :phone, :on => :extra_user_information
    property :fax, :on => :extra_user_information
    property :website, :on => :extra_user_information
    property :company, :on => :extra_user_information
    property :customer_code, :on => :extra_user_information

    property :credit_card do
      property :code, :on => :credit_card
      property :number, :empty => true
      property :exp_month, :empty => true
      property :exp_year, :empty => true
      property :cvv, :empty => true
    end

    property :shipping_address do
      property :street1, :on => :shipping_address
      property :street2, :on => :shipping_address
      property :locality, :on => :shipping_address
      property :region, :on => :shipping_address
      property :postal_code, :on => :shipping_address
      property :country_code, :on => :shipping_address
      property :use_billing_address, :empty => true
    end

    property :billing_address do
      property :street1, :on => :billing_address
      property :street2, :on => :billing_address
      property :locality, :on => :billing_address
      property :region, :on => :billing_address
      property :postal_code, :on => :billing_address
      property :country_code, :on => :billing_address
    end

  end

  property :premium_subscription do
    property :start_date, :on => :premium_subscription
    property :transaction_code, :on => :premium_subscription
    property :customer_code, :on => :premium_subscription
    property :chosen_plan, :empty => true
  end

  property :premium_reward do
    property :customer_code, :on => :premium_reward
    property :transaction_code, :on => :premium_reward
    property :purchase_date, :on => :premium_reward
    property :gift_info, :on => :premium_reward
    property :shirt_size, :empty => true
    property :shirt_color, :empty => true
    property :quantity, :empty => true #:on => :premium_reward
    property :accept_premium_reward, :empty => true
  end

  property :opt_in_to_bt_marketing, :empty => true
  property :opt_in_to_partner_marketing, :empty => true
  property :agree_to_tos, :empty => true

  model :user, :on => :user
  
  def initialize(user)
    @user = user
    super
  end

  def submit(params)

    self.save # this is where it blows up
    :complete

  end

end

SubscriptionsController.rb

class SubscriptionsController < ApplicationController

  authorize_resource

  def new
    redirect_to current_user, :notice => I18n.t('subscription.already_pro') if current_user.is_paid?
    @user = build_subscription(current_user)
    @subscription_form = SubscriptionForm.new(@user)
  end

  def create
    @user = build_subscription(current_user)
    @subscription_form = SubscriptionForm.new(@user)

    case @subscription_form.submit(params[:user])
    when :complete
      redirect_to @user, :notice => t('subscription.congratulations')
    when :needs_confirmation
      render 'confirm'
    else
      render 'new'
    end
  end

  private

  def build_subscription(user)
    # For Reform::Form, need to build out items
    user.build_extra_user_information
    user.extra_user_information.build_credit_card
    user.extra_user_information.build_billing_address
    user.extra_user_information.build_shipping_address
    user.build_premium_subscription
    user.build_premium_reward
    user
  end

end