Spree store credit fix

consume_store_credits.rb

Spree::Order.class_eval do
  checkout_flow do
    go_to_state :address
    go_to_state :delivery
    go_to_state :payment, :if => lambda { |order| order.payment_required? }
    go_to_state :confirm, :if => lambda { |order| order.confirmation_required? }
    go_to_state :complete, :if => lambda { |order| (order.payment_required? && order.has_unprocessed_payments?) || !order.payment_required? }
    remove_transition :from => :delivery, :to => :confirm
  end

  def consume_users_credit

    credit_used = self.store_credit_amount

    user.store_credits.each do |store_credit|
      break if credit_used == 0
      if store_credit.remaining_amount > 0
        if store_credit.remaining_amount > credit_used
          store_credit.remaining_amount -= credit_used
          store_credit.save!
          credit_used = 0
        else
          credit_used -= store_credit.remaining_amount
          store_credit.update_attribute(:remaining_amount, 0)
        end
      end
    end
  end


  def finalize_with_consume_users_credit!
    consume_users_credit
    finalize_without_consume_users_credit!
  end
  alias_method_chain :finalize!, :consume_users_credit
end