activerecord/test/models/shop.rb


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module Shop
  class Collection < ActiveRecord::Base
    has_many :products, :dependent => :nullify
  end

  class Product < ActiveRecord::Base
    has_many :variants, :dependent => :delete_all
    belongs_to :type

    class Type < ActiveRecord::Base
      has_many :products
    end
  end

  class Variant < ActiveRecord::Base
  end
end