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Editorial Team
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Asked: 2026-05-21T03:34:09+00:00

I’m working in a new rails app and I created a little utility class

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I’m working in a new rails app and I created a little utility class in RAILS_ROOT/lib. I use this class in one of the controller with a require. In local this class is correctly loaded but when I deploy the app on heroku it crashes with:

LoadError (no such file to load — MyUtilityClass)

Any ideas?

UPDATE:

I found the problem. In my controller I did a ‘require “MyUtilityClas” ‘ and that was working fine locally. On heroku I needed to do a ‘require “/lib/my_utility_class.rb” ‘. Hmmm… I do not really understand why in fact…

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1 Answer

  1. Editorial Team

    you want require 'my_file_to_require' assuming you’ve named your file properly.

    Require takes the filename, not the module/class name, so:

    require 'MyUtilityClass'   # wrong

    is wrong but

    require 'my_utility_class'  # correct

    is correct, again assuming you’ve stuck to the normal ruby/rails file naming conventions.

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