Custom "cops" for RuboCop: an emergency service for your Ruby code

It is hard to find a Ruby developer who never heard of RuboCop. In all the recent Evil Martians projects, RuboCop is included in the CI pipeline from the early days. However, sometimes it may be helpful to write more rules manually and to enforce some project-specific practices. By the end of the article, you’ll be in a great position to cope with custom cops, add them to your application, or even extract them into a separate gem. Let’s get started!In our experience, most well-maintained, large, and cutting-edge Ruby applications use RuboCop—a tool for checking and maintaining Ruby code style. Just include RuboCop into your CI suite, and it will save time and effort when reviewing the pull requests for basic style violations.