Despite using RuboCop for years, I was recently surprised to find that it was not scanning certain important files in my Rails project. When I dug further, I discovered that RuboCop’s system for configuring inclusion and exclusion rules is quite complicated and exhibits some of the infamous “Rails magic”. What started out as a simple question – why isn’t RuboCop checking my bin/setup script? – turned into hours of troubleshooting. Here’s what I learned: https://mattbrictson.com/blog/including-and-excluding-files-in-rubocop