thoughtbot--factory_bot/lib/factory_girl/attribute/callback.rb

class Factory
  class Attribute #:nodoc:

    class Callback < Attribute  #:nodoc:
      def initialize(name, block)
        @name  = name.to_sym
        @block = block
      end

      def add_to(proxy)
        proxy.add_callback(name, @block)
      end
    end

  end
end