Four Days on Rails is a 40 page introduction to useful Rails techniques and where to go on the web for more information.
is well documented on-line; in fact, possibly too well documented for
beginners, with over 30,000 words of on-line documentation in the
format of a reference manual. What's missing is a roadmap (railmap?)
pointing to the key pages that you need to know to get up and running
in Rails development…Four Days on Rails is designed to fill that gap.