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Use a Ruby Linter

Published: Nov 17th, 2020

This is part of Joyful Rails, a list of recommendations to make developing your Rails app more productive and joyful.

In this article, we are talking about using a Ruby linter.


The longer you wait to add a Ruby linter, the more work you will have to correct style errors that have accumulated. For that reason, I recommend adding a linter, such as RuboCop, as early as possible.


Having a consistent style makes code easier to read and maintain. Using a linter makes it easy to conform to a consistent style. In a lot of cases, your linter can make corrections automatically.


  1. Add the RuboCop gem. Add the gem 'rubocop' to the development group of your Gemfile and run bundle.
  2. Configure RuboCop. Add a .rubocop.yml with the RuboCop configuration.
  3. Run RuboCop with auto-correct, rubocop --auto-correct.
  4. Correct errors that RuboCop cannot correct automatically.