class Shoulda::Matchers::ActiveModel::Qualifiers::IgnoreInterferenceByWriter

def default_to(argument)
  temporary_ignore_interference_by_writer =
    IgnoreInterferenceByWriter.new(argument)
  unless changed?
    @setting = temporary_ignore_interference_by_writer.setting
    @condition = temporary_ignore_interference_by_writer.condition
  end
  self
end