Layered Design for Ruby on Rails Applications

Transition from Rails' traditional MVC trio to layered abstractions with state machines, workflows, and AI integrations and evolve your codebase into a flexible, future-ready applicationFree with your book: DRM-free PDF version + access to Packt's next-gen Reader* Key FeaturesUnderstand Rails architectural patterns, their strengths and limitsOrganize business logic in Rails apps when the default MVC approach is insufficientIntroduce abstractions to integrate and manage AI features effectivelyPurchase of the print or Kindle book includes a free PDF eBookBook DescriptionRails accelerates web development with its convention-over-configuration principle and MVC pattern. But as your app grows, that simplicity can turn into tangled complexity, making it harder to maintain and extend. The second edition of Layered Design for Ruby on Rails Applications helps tackle this challenge head on, guiding you toward a more scalable and maintainable architecture. Written by a seasoned software engineer and open source contributor to Ruby on Rails, this updated edition refines the proven techniques from the first edition and introduces timely new topics that reflect today s development challenges. You ll dive deeper into state machines and workflows, learning how to identify, embed, and eventually isolate them for clarity and resilience. You ll also explore the exciting frontier of abstractions in the AI era, treating LLMs as APIs, structuring agent layers, and integrating third-party libraries to keep your AI features organized and testable. By embracing layered abstractions, you ll not only reduce complexity but also improve your ability to adapt to change - whether adding new features, scaling systems, or weaving AI capabilities into your applications. By the end of the book, you ll be equipped to design clean, extensible, and future-ready Rails applications. *Email sign-up and proof of purchase requiredWhat you will learnGet to grips with Rails' core components and its request/response cycleSee how Rails' convention-over-configuration principle shapes developmentExplore patterns for flexibility, extensibility, and testability in RailsIdentify and refactor Rails anti-patterns for improved maintainabilityImplement patterns to tame bloated models and messy viewsTransition from implicit to explicit state machines and workflowsTreat LLMs as APIs and extract agent layers for AI-powered featuresUse third-party libraries and RAG strategies to manage AI context effectivelyWho this book is forThis book is for Rails developers who want to manage and master the growing complexity of their applications. Whether you re extending an MVP into a robust system, scaling a monolithic app, or exploring AI-driven features, this book equips you with the design patterns and abstractions to keep your codebase future-proof. A solid understanding of Rails principles is required, and prior experience building Rails apps will help you put these patterns into practice.]]>