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That isn't the case for ActionCable, which will become a dependency of the 'rails' gem [1]. You'll have to unbundle the rails gem in your Gemfile, then require the frameworks you want one-by-one in application.rb

[1]: https://github.com/rails/rails/blob/master/rails.gemspec#L28

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You can just add each Rails framework to your Gemfile and be done. `require "rails/all"` catches load errors, so you don't need to require the frameworks manually in application.rb.

https://gist.github.com/nateberkopec/1184c81a92c10d84d779

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