Rails will get redefined when using devise-doorkeeper

[bvogel]

When using devise :doorkeeper in a model, the Rails module will be hidden by Doorkeeper::Rails and only accessible as ::Rails

I created a minimal project to highlight the issue; it is a minimal rails app with added devise-doorkeeper and minimal configurations for devise, doorkeeper and devise-doorkeeper. The only created test will highlight the error alternatively simply open a console and invoke User.new.rails_version:

Loading development environment (Rails 6.1.4.1)
3.0.2 :001 > User.new.rails_version
   (1.7ms)  SELECT sqlite_version(*)
/Users/username/Development/devise-doorkeeper-classloading-issue/app/models/user.rb:6:in `rails_version': undefined method `version' for Doorkeeper::Rails:Module (NoMethodError)

[bvogel]

@wireframe if you could give me pointers as where to start looking, I'd happily prepare a PR. Appreciate the help, thank you!