Ruby on rails. Best practices

This document discusses best practices for developing Ruby on Rails applications. It provides guidelines for structuring Rails code, including using model associations and callbacks, extracting logic into modules and composed classes, and leveraging patterns like observers to organize code. The document also recommends practices like keeping finders on their own models and using named scopes to improve code quality. It aims to help developers write clean, well-organized code that follows principles like DRY (Don't Repeat Yourself) and the Law of Demeter.