Using subscription_fu

subscriptions_controller.rb

class SubscriptionsController < ApplicationController
  before_filter :authenticate_user!

  def show
    @page_css = 'user'
    @subscription = current_user.active_subscription
    @upcoming = current_user.upcoming_subscription
    @latest = current_user.latest_valid_subscription
  end

  def update
    @subscription = current_user.build_next_subscription(params[:plan])
    @subscription.save!
    @transaction = @subscription.initiate_activation(current_user)
    url = @transaction.start_checkout(current_user_subscription_transaction_url, abort_current_user_subscription_transaction_url)
    url += "?token=#{@transaction.identifier}" if @transaction.gateway == 'nogw'
    logger.info url
    redirect_to url
  end
end

transactions_controller.rb

class TransactionsController < ApplicationController
  before_filter :authenticate_user!
  before_filter :require_valid_transaction

  def show
  end

  def abort
    @transaction.abort
    flash[:notice] = "Transaction aborted."
    redirect_to current_user_subscription_url
  end

  def update
    if @transaction.complete
      flash[:notice] = "Sucessfully updated your subscription: #{@transaction.sub_plan.human_name}"
    else
      flash[:notice] = "Transaction was not successfull, please try again."
    end
    redirect_to current_user_subscription_url
  end

  private

  def require_valid_transaction
    @token = params[:token]
    @transaction = current_user.pending_transaction(@token)
    unless @transaction
      logger.info("Invalid transaction for token: #{@token}")
      flash[:error] = "Invalid transaction, please try again."
      redirect_to current_user_subscription_url
    end
  end
end