Rails 2 to 3 routing question

Im using the book railsspace but its made for rails 2 ive ran in to a bit of a snag the rails 2 routing looks like this

map.connect 'profile/:screen_name', :开发者_如何转开发controller => 'profile', :action => 'show'

how do i make it work for rails 3 routing?

match 'profile/:screen_name' => 'profile#show'

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