I have been using Octoshark successfully in production for about a year handling millions of API requests per day and sending millions of emails per day for both GoDaddy and Mad Mimi.
Every now and then I discover some features in Rails that are not that (arguably) commonly used. One of them would definitely be a nice addition to ActiveRecord::QueryMethods - extending method.
Come with me on a journey through the internals of Rails, as we trace a request from the web server to the controller action method, and follow the response back again.