[From the issue I opened about it: 
https://github.com/rails/rails/issues/28152]

I don't know if this is more a bug report or a feature request, or even an 
SO question [image: :flushed:] anyway:

I have a model Activity which has a lot of sti types, so a lot of related 
class files. I would like to organize them into app/models/activities, in 
order to separate them from the other models. I can actually accomplish it 
using config.eager_load_paths += %W(#{config.root}/app/models/activities) 
directive, but then in development mode the following exception is raised:

ArgumentError: A copy of SubFolderModel has been removed from the module tree 
but is still active!

I guess the reason is that app/models/subfolder conflicts with app/models 
autoload. Anyway, is there a way to organize models using different 
directories?

Steps to reproduce 
   
   - Create an app/models subfolder
   - Put some models inside
   - Add config.eager_load_paths += %W(#{config.root}/app/models/subfolder) 
   to config/application.rb
   - Start the application in development mode

Expected behavior

Everything works fine

Actual behavior

Sometimes the following exception is raised:

ArgumentError: A copy of SubFolderModel has been removed from the module tree 
but is still active!

System configuration

*Rails version*: 5.0.1

*Ruby version*: 2.4.0

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