One thing I kept trying to reinforce when I was teaching Rails/Ruby, was that everything in Rails is just Ruby code. Not everything in Ruby is Ruby (some of it'

One thing I kept trying to reinforce when I was teaching Rails/Ruby, was that everything in Rails is just Ruby code. Not everything in Ruby is Ruby (some of it's C), but I haven't come across anything in Rails itself that isn't Ruby. There is no "Rails code", it's just a lot of Ruby that someone else already wrote.