instance method superclass_delegating_writer

# File activesupport/lib/active_support/core_ext/class/delegating_attributes.rb, line 33
  def superclass_delegating_writer(*names)
    names.each do |name|
      class_eval <<-EOS
        def self.#{name}=(value)  # def self.only_writer=(value)
          @#{name} = value        #   @only_writer = value
        end                       # end
      EOS
    end
  end