tap/app/models/order_item.rb

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# == Schema Information
#
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# Table name: order_items
#
# id :integer not null, primary key
# order_id :integer
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# product_id :integer not null
# count :integer default("0")
#
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class OrderItem < ActiveRecord::Base
belongs_to :order
belongs_to :product
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validates :product, presence: true
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validates :count, presence: true, numericality: { only_integer: true }
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before_destroy :put_back_in_stock!
after_create :remove_from_stock!
private
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def remove_from_stock!
product.decrement!(:stock, count)
end
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def put_back_in_stock!
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product.increment!(:stock, self.count)
end
end