How to reload a Ruby App?

I have a host that has Ruby 'dynamically loaded'.
I want the hosted app to run in production mode,
with the development being my local pc.

I've uncommented the line in enviroment.rb to force
production mode but the change doesn't seem to occur as
when I try a db:migration .. rails is trying the development database settings.

How can I make the changes take effect?
(so my hosted rails app runs in production mode?)

Thanks