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Home/ Questions/Q 536847
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Editorial Team
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Editorial Team
Asked: May 13, 20262026-05-13T09:51:53+00:00 2026-05-13T09:51:53+00:00

I have a puzzling issue regarding modules defined in the lib dir I have

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I have a puzzling issue regarding modules defined in the lib dir

I have two files

#lib/authentication.rb

module Authentication

end


#lib/test_module.rb

module TestModule

end

In my application controller I have

 class ApplicationController < ActionController::Base
     include Authentication
     include TestModule
 end

The Authentication Module loads properly but the TestModule does not

I get “uninitialized constant ApplicationController::TestModule”

I am stumped… anyone?

EDIT: Does anyone know where I could look to debug this?

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  1. Editorial Team
    Editorial Team
    2026-05-13T09:51:54+00:00Added an answer on May 13, 2026 at 9:51 am

    Adding require 'lib/test_module' at the top of your ApplicationController file might help

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