Master Ruby on Rails with practical tutorials, best practices, performance tips, and real-world techniques for building modern web applications.
Learn Rails nested attributes with accepts_nested_attributes_for, fields_for, strong parameters, validations, and security.
Learn how Rails callbacks work, when they run in the Active Record lifecycle, and when to avoid them for cleaner, safer code.
Learn how Rails Concerns work, when to use ActiveSupport::Concern, and when concerns make your Rails app harder to maintain.
Learn how to configure Rails Content Security Policy, use nonces, test in report-only mode, and fix CSP violations step by step.
Learn Rails Active Storage: file uploads, has_one_attached, variants, direct uploads, S3, validations, and production tips.
Learn how the Rails request lifecycle works, from the web server and middleware to routing, controllers, views, and the response.
Learn how Rails autoloading works with Zeitwerk, including naming rules, eager loading, namespaces, and fixing NameError.
Learn how Rails scopes make Active Record queries cleaner, reusable, and easier to maintain with practical examples.
Learn how Rails cache keys work, including cache_key, cache_key_with_version, fragment caching, and cache invalidation.
Learn the difference between pluck and select in Rails, what SQL each generates, and when to use them in Active Record queries.
