Morphine - Lightweight dependency injection for Ruby

GitHubber Brandon Keepers:

Many argue that you don’t need dependency injection in dynamic languages like Ruby. What they are really saying is you don’t need a complicated dependency injection framework, and they’re right.

So Brandon created Morphine, a simple DI library for Ruby. With Morphine, you can create a DI container by including the Morphine module and specifying your dependencies.

class Application
  include Morphine

  register :track_service do
    KestrelTrackService.new(kestrel_client, config.tracking_queue)
  end

  register :track_processor do
    KestrelTrackProcessor.new(blocking_kestrel_client, config.tracking_queue)
  end

private

  register :kestrel_client do
    c = config['kestrel'].dup
    Kestrel::Client.new(c.delete('servers'), c.symbolize_keys)
  end

  register :blocking_kestrel_client do
    Kestrel::Client::Blocking.new(kestrel_client)
  end
end

If you feel Ruby benefits from dependency injection and want to contribute, check out the just released source on GitHub.