Rails - Feb 2012 - Associating Controllers with pre-existing database/s

As a Rails newbie, apologies if I''m about to ask a dumb question.
All the Rails tutorials I''ve followed start by creating a database from
scratch, is there any way of using a pre-existing database to establish
the Rails MVC framework? I know I can do all the work by hand, but it
seems to me  there should be a way of extracting the schema information
from the database/s, and using this to generate basic scaffolding.
The database in question is in SQlite3 format.

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