subscription.rb

class Subscription < ActiveRecord::Base
 belongs_to :user
 attr_accessible :user_id, :stripe_card_token


  def save_with_payment
    if valid?
      self.stripe_customer_token = customer.id
      save!
    end
  rescue Stripe::InvalidRequestError => e
    logger.error "Stripe error while creating customer: #{e.message}"
    errors.add :base, "There was a problem with your credit card."
    false
  end




end

subscriptions_controller.rb

def create
    @subscription = Subscription.new(params[:subscription])
    @user = User.new(params[:user])
        respond_to do |format|
          if   @user.save &&   @subscription.save_with_payment("1", @user)
               @subscription.user_id = @user.id
               @subscription.save
          format.html { redirect_to pages_thankyou_url }
          else
       format.html { render action: "new"  }
              end
        end
 end