Bottom Up ORM / scaffolding

Hi, I am a total newbie to ruby on rails, but have been investigating it and ruby and ruby on rails seem to have a LOT of things i really like about a programming language.. liked most of it.. except 1 thing..

And that is ruby on rails scaffolding, it build up ur basic model view controller from the database! I really dont like that..

I am the kind of developer that likes to design his application object oriented (UML), and base the application on that.. not on the database that i derive from the object model..

By building ruby objects bottom up from the database i loose all kinds of things, like generalization, association classes, interfaces...

Probably this can all be re-adjusted after scaffolding, but im looking for the perfect language to sink my head in.. with everything i like.. possibly build my career on it.

Can somebody tell me if i am right about what im saying about ruby on rails scaffolding or not?

Regards, Klaas