Just a friendly warning; It's *very* unlikely that you should be changing the db schema dynamically.
Do consider having someone review your design.
Sincerely, Isak
Sometimes legacy databases leave you no choice but to layer the same model over different database tables. You then have to think about how to reference columns when presenting data to the user. I'm 'lucky' (if anyone who has to work with legacy databases in RoR can be called lucky), in my case I have another table which tells me what's in the first table.
Allan