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As a senior software engineer primarily working in Ruby but with experience across Go, Node.js, and Python, I’m always evaluating tools and frameworks that promise to make our systems smarter, faster, or more adaptive. Recently, two acronyms from the world of LLMs and AI infrastructure have been gaining traction in mainstream development: RAG (Retrieval-Augmented Generation) and MCP (Model Control Plane). Both offer powerful abstractions that can benefit modern software architectures far beyond machine learning labs.

While working on a Rails app recently, I stumbled across a frustrating bug that only appeared in the test environment. Everything worked perfectly in the development console. Models loaded fine. Associations were intact. My concern methods behaved exactly as expected. But then my test suite started throwing mysterious NoMethodErrors—complaining that an ActiveRecord model was missing associations it clearly had.

Alberto Fortin’s recent post on dialing back LLM usage resonated with me. Like many developers, I’ve found AI to be both a productivity godsend and a source of friction. It can feel like magic — until it quietly leads you down the wrong path.

If you’ve ever encountered a situation where your Rails model associations work perfectly in the console but mysteriously fail in your test suite, you’re not alone. I recently ran into this exact issue and wanted to share the solution along with some insights about Rails’ autoloading behavior.

Welcome back to my series on “The Effective Engineer” by Edmond Lau. In the previous posts, I introduced the key themes of the book, discussed the importance of prioritization, and explored leveraging tools and technology. Today, I’ll delve into another critical theme: the importance of quick iteration and continuous learning.

Welcome back to my series on “The Effective Engineer” by Edmond Lau. In the previous posts, I introduced the key themes of the book and discussed the importance of prioritization. Today, I’ll delve into another crucial theme: leveraging tools and technology to amplify your productivity and impact.