Isolating Rails Engines with RuboCop | by Max Heinritz | Flexport Engineering

Flexport’s main backend service is a Ruby on Rails monolith. In the company’s early days, Rails helped us move quickly. However, like many other fast-growing startups, we’ve found it challenging to manage complexity with Rails as the team has grown. Conveniences that once improved productivity now make it hard to understand what’s going on: many two-way model associations, arbitrary reads and writes through ActiveRecord, a global app/ directory structure, implicit behavior, etc.