1 class Product < ActiveRecord::Base
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2 set_primary_keys :id # redundant
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3 has_many :product_tariffs, :foreign_key => :product_id
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4 has_one :product_tariff, :foreign_key => :product_id
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6 has_many :tariffs, :through => :product_tariffs, :foreign_key => [:tariff_id, :tariff_start_date]
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