Rails Autoload Path

by Yuva, Co-founder

Typically autoload paths configured in application.rb will be like this:

config.autoload_paths += %W(lib)

Recently we faced a problem where we were adding another root level folder app to autoload_paths, and using one of utility classes inside that folder. Everthing worked fine in development, but not in production. We started seeing strange errors while running migrations:

cannot load such file -- app/subdir1/utility_class

Inspecting $LOAD_PATH revealed that there is no absolute path for app folder. Appending autoload_path with absolute path solved this issue.

config.autoload_paths += [ Rails.root.join("app") ]

More articles

Ruby's JIT Journey: From MJIT to YJIT to ZJIT

A walkthrough of Ruby’s JIT history and the design ideas behind MJIT, YJIT, and ZJIT

Read more

Evaluating LLM Agents: Confidence Through Pre-Production Testing

How to design practical pre-production testing for LLM systems—using datasets, evaluators, and experiments to catch regressions before shipping.

Read more

Ready to Build Something Amazing?

Codemancers can bring your vision to life and help you achieve your goals