The Complete Guide to Avoiding and Fixing Common Rails 3 Code and Design Problems As developers worldwide have adopted the powerful Ruby on Rails web framework, many have fallen victim to common mistakes that reduce code quality, performance, reliability, stability, scalability, and maintainability. Rails™ AntiPatterns identifies these widespread Rails code and design problems, explains why they’re bad and why they happen—and shows exactly what to do instead. The book is organized into concise, modular chapters—each outlines a single common AntiPattern and offers detailed, cookbook-style code solutions that were previously difficult or impossible to find. Leading Rails developers Chad Pytel and Tammer Saleh also offer specific guidance for refactoring existing bad code or design to reflect sound object-oriented principles and established Rails best practices. With their help, developers, architects, and testers can dramatically improve new and existing applications, avoid future problems, and establish superior Rails coding standards throughout their organizations.   This book will help you understand, avoid, and solve problems with  Model layer code, from general object-oriented programming violations to complex SQL and excessive redundancyDomain modeling, including schema and database issues such as normalization and serializationView layer tools and conventionsController-layer code, including RESTful codeService-related APIs, including timeouts, exceptions, backgrounding, and response codesThird-party code, including plug-ins and gemsTesting, from test suites to test-driven development processesScaling and deploymentDatabase issues, including migrations and validationsSystem design for “graceful degradation” in the real world