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Ruby on Rails is an extremely productive web application framework written in Ruby by David Heinemeier Hansson.
This is a open source Ruby framework for developing database-backed web applications.
This tutorial will give you a complete understanding on Ruby on Rails 2.1.x.
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This is the old version of Rails. So if you are running old version of Ruby on Rails, then I would recommend you to go through the following tutorial
Ruby on Rails 1.2.x
A quick review of all the major concepts related to Ruby on Rails 2.1.0
Ruby on Rails 2.1.x Quick Reference Guide
A collection of Ruby on Rails 2.1.x Sites and Books is given at this page.
Ruby on Rails 2.1.x Resources