I've described the process of building a sample web application in Rails
Although not quite detailed enough to be considered a tutorial, it
should be a useful supplement to other tutorials, with notes on how to
implement various features including CRUD, search, authentication, page
composition, form validation, file upload, and testing. The full source
is available for download as an Eclipse project, so if anybody is
building a RoR application and gets stuck on one of these things, you
can download the app and see how I solved it.