`RailsAdapter::LoadedTooLateError` occurs if Zeitwerk is enabled

[kg8m]

Hi. Thank you for developing this gem.

I have an issue where GoogleAuthenticatorRails::ActionController::RailsAdapter::LoadedTooLateError occurs when running RSpec tests on Rails with Zeitwerk. This issue is the same as mentioned in https://github.com/jaredonline/google-authenticator/pull/63#issuecomment-1159866679.

This issue is caused by defined?(::ApplicationController) always returning "constant" when Zeitwerk is enabled. Zeitwerk uses Ruby's built-in autoload, so this issue is originally caused by autoload.

I'll create a pull request to fix this issue soon. I hope you can check it out.

---

Note: You can reproduce the autoload and defined? behavior as follows:

1. Put sample.rb:

   class Sample
   end

2. Run ruby -e 'p defined?(Sample)' in your shell:
   • You will see nil because Sample isn't loaded
3. Run ruby -e 'autoload :Sample, "./sample"; p defined?(Sample)' in your shell:
   • You will see "constant" even though Sample isn't loaded because Sample is an autoload constant

[renodor]

We are experiencing the same issue.

• Gem version: 3.0.0
• Ruby version: 3.1.2
• Rails version: 6.0.6

Rspec error when running specs:

Failure/Error: require "rspec/rails"

GoogleAuthenticatorRails::ActionController::RailsAdapter::LoadedTooLateError:
  GoogleAuthenticatorRails is trying to prepend a before_filter in ActionController::Base.  Because you've already defined ApplicationController, your controllers will not get this before_filter.  Please load GoogleAuthenticatorRails before defining ApplicationController.

[jaredonline]

Heya @kg8m and @renodor just pushed 3.1.0 of the gem with your changes; should be fixed!

[kg8m]

Thank you so much!