I want to copy the twitter profile page and have a url with a username "http://www.my-app.com/username" and while I can manually type this into the address bar and navigate to the profile page I can't link to the custom URL.

I think the problem is in the routes - here's the code in my routes.rb

map.connect '/:username', :controller => 'users', :action => 'show'

Also, I have Question and Answer models and I want to link to them with the customized URL like so:

http://www.my-app.com/username/question/answer/2210

ruby-on-rails url routes
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