1. Using Arel to Compose SQL Queries

  2. How to Evaluate Your Rails JSON API for Performance Improvements

  3. Back to Basics: HTTP Requests in Rails Apps

  4. Automatically Wait for AJAX with Capybara

  5. ActiveRecord's where.not

  6. How We Test Rails Applications

  7. Handling Associations on Null Objects

  8. Rendering Collections in Rails

  9. Using Polymorphism to Make a Better Activity Feed in Rails

  10. A Tour of Rails’ jQuery UJS