RailsRequestId 
Web requests in Rails get assigned a unique request id. To access this id in a threadsafe manner, you can simply
::RailsRequestId.get
Installation
Add this to your Gemfile
gem 'rails_request_id'
Get in touch!
If you're using rails_request_id, I'd love to hear from you. Drop me a line and tell me what you think at: [email protected]
Contributing
It's on GitHub, you know what to do!