Ruby Multiple IO

multiple_io.rb

class MultipleIO
  def initialize(*targets)
    @targets = targets
  end

  def write(*args)
    @targets.each { |t| t.write(*args) }
  end

  def close
    @targets.each(&:close)
  end
end

usage.rb

Hulk::Application.configure do
  # ...
  # other config settings for development
  # ...
  log_file            = File.open("log/development.log", "a")
  config.logger       = Logger.new MultiIO.new(STDOUT, log_file)
  config.logger.level = Logger.const_get('DEBUG')
  # ...
end