Spree - Promotion adjustment action beyond first ignored #3262

promotion_decorator.rb

=begin

  Tested in Spree 1.2.5
  Ref: https://github.com/spree/spree/issues/3262
  https://github.com/spree/spree/commit/bdd4db95eb2cce3e87f3991dbeca22e275862fc3

=end

::Spree::Order.class_eval do

  # Tells us if there if the specified promotion is already associated with the order
  # regardless of whether or not its currently eligible.  Useful because generally
  # you would only want a promotion to apply to order no more than once.
  #
  # Receives an adjustment +originator+ (here a PromotionAction object) and tells
  # if the order has adjustments from that already
  def promotion_credit_exists?(originator)
    !! adjustments.promotion.reload.detect { |credit| credit.originator.id == originator.id }
  end

end

::Spree::Promotion::Actions::CreateAdjustment.class_eval do

  # Creates the adjustment related to a promotion for the order passed
  # through options hash
  def perform(options = {})
    order = options[:order]
    return if order.promotion_credit_exists?(self)

    self.create_adjustment("#{I18n.t(:promotion)} (#{promotion.name})", order, order)
  end

end