def ignore(*ignored)
      options[:ignored] = ->(attrs) do
        attrs = attrs.dup; ignored.each { |key| attrs.delete(key) }; attrs
      end
    end
def ignore(*ignored)
      options[:ignored] = ->(attrs) do
        attrs = attrs.dup; ignored.each { |key| attrs.delete(key) }; attrs
      end
    end
Public: Allows to ignore certain attributes, that can be accessed in the
 after_create callback.