Applying a patch to rails



I recently upgraded to Ruby 1.8.3 and I need to apply the patch Ticket
#2245: as_clean_logger_rb-fixed.patch
to make the bad stuff go away. But I am unsure of how to apply the
path to an already installed gem (rails).

Will it fix my existing RoR apps as well as new ones?

Thanks for listening to my Nuby question.