tap/app/models/order.rb

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# == Schema Information
#
# Table name: orders
#
# id :integer not null, primary key
# user_id :integer
# cost :integer
# created_at :datetime not null
# updated_at :datetime not null
#
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class Order < ActiveRecord::Base
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belongs_to :user
has_many :order_products
has_many :products, { through: :order_products} do
def << (product)
if proxy_association.owner.products.include?(product)
proxy_association.owner.order_products.find_by(product: product).increment!(:count, 1)
else
super
end
end
end
validates :user, presence: true
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accepts_nested_attributes_for :order_products, reject_if: proc { |op| op[:count].to_i <= 0 }
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end