Logging with ActiveSupport

gistfile1.rb

require 'sinatra'
require 'active_support'
require 'logger'

class SinatraTest < Sinatra::Application
  module RedirectedLogger
    def self.logger=(value)
      Thread.current['sinatra.logger'] = value
    end

    def logger
      Thread.current['sinatra.logger'] ||= Rack::NullLogger.new(nil)
    end
  end

  class TestClass
    include RedirectedLogger
    def initialize
      logger.info "my message"
    end
  end

  before { RedirectedLogger.logger = logger }
  get('/') { TestClass.new }

  run!
end