He leído aquí un artículo muy ilustrativo de la nueva forma de trabajar con scaffold en Rails 2.0. El resumen es el siguiente:

• Installed Rails
  #gem install rails –include-dependencies
• Created an aplication with the rails command
  $rails exchange
• Created the databases for the application with the rake command
  $ rake db:create:all
• Used the script/generate command to create the scaffolding for the application
  $ ruby script/generate scaffold Movie title:string description:text one_sheet_url:string
• Created the database table using the generated migration file
  $ rake db:migrate
• Started the webserver with the script/server command
  $ ruby script/server
• Pointed our web browser to the application and started entering and editing data
  http://localhost:3000/movies

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