Why do you have to restart the server when changing the code in the lib?

Question

Ruby on Rails

I have my own code inside lib/math/paper/fetcher.rb . Development in RubyMine . Enabled development mode, debug . You go to the page, the debugger went to the controller, from there to lib, executed the code there and returned it to the controller and from there to the view. It seems to be standard.
But, if you make changes to the code in fetcher.rb , then you have to restart the application every time, because the changes are not picked up on the fly. If you make changes in the controller, then everything is fine, but not in the lib.
In config/application.rb there is autoload enabled:

config.autoload_paths += %W[#{config.root}/lib]
    config.autoload_paths += Dir["#{config.root}/lib/**/"]

Answer 1

I would not touch the lib folder. And I created an app / lib folder and would place your services there.
But in theory, this is how it should work

config.autoload_paths << Rails.root.join("lib")
config.eager_load_paths << Rails.root.join("lib")