How can I preload concerns in a rails initializer using Rails 6/Zeitwerk?

Question

I\'m working with an initializer that does some monkey patching on app start by including some app concerns into a third party lib. Basically:

# config/initi         


        

Answer 1

Would help if I read the error message a bit more closely:

Autoloading during initialization is going to be an error condition in future versions of Rails.

Discussion for the change is here and guide is here.

In short, autoloading shouldn't be done in initializers, and this is going to be phased out. Solutions are to either 1) Don't use stuff that needs to be autoloaded in initializers (preferred, obviously), or 2) explicitly require dependencies in initializers.

So I would do:

# config/initializers/my_initializer.rb

require 'my_concern1'
require 'my_concern2'

class SomeExternalLib
  include MyConcern1
  include MyConcern2
end