Using rescue_from outside of rails

I have a script that is utilizing the active_record gem outside of rails
for a standalone app, but I am having trouble trying to incorporate the
rescue_from method from Rails.

Would anyone know how to use this method without having to be in a rails
app?

According to my ri, rescue_from is part of ActiveSupport.

I would assume you want to use just the normal rescue.

Does that help?