groundctrl/shopping_mall

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app/models/spree/order_decorator.rb

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Maintainability
A
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Spree::Order.class_eval do
  has_many :orders_promotions, class_name: 'Spree::OrdersPromotion'
  has_many :promotions,
           through: :orders_promotions,
           class_name: 'Spree::Promotion'
end