Rails Stimulus and Importmaps in 2026: Modern JavaScript Without Build Tools
Learn how to use Stimulus controllers and Importmaps in Rails 8.1 to build interactive applications without webpack, esbuild, or any JavaScript bundler.
Ruby on Rails
BACKEND
Full-stack web framework built with Ruby offering a "Convention over Configuration" and "Don't Repeat Yourself" approach to maximize productivity. Mature MVC architecture with Active Record ORM, automatic scaffolding, robust migration system and complete ecosystem for REST APIs and modern web applications.
What you'll learn
Modern Ruby with elegant syntax, blocks, metaprogramming and gems
Active Record ORM with associations, validations, callbacks and migrations
Convention over Configuration for maximum productivity
Rails generators for rapid scaffolding (models, controllers, migrations)
Action Cable for real-time WebSockets natively integrated
Active Storage for file uploads with cloud storage (S3, GCS)
Action Mailer for transactional emails with ERB templates
Active Job for background jobs with adapters (Sidekiq, Resque, Delayed Job)
Comprehensive testing (RSpec, Minitest, fixtures, factories with FactoryBot)
Performance with caching (Redis, Memcached), eager loading and turbo-rails
Key topics to master
The most important concepts to understand this technology and ace your interviews
1
Ruby: blocks, procs, lambdas, symbols, metaprogramming, modules and mixins
2
Rails architecture: MVC pattern, config/routes.rb, autoloading, Zeitwerk
3
Active Record: models, associations (has_many, belongs_to, has_and_belongs_to_many)
4
AR validations: presence, uniqueness, custom validators, validation contexts
5
AR callbacks: before_save, after_create, around_update, lifecycle hooks
6
Migrations: create_table, add_column, change_column, rollback, schema.rb
7
Routing: resources, nested routes, namespaces, constraints, route helpers
8
Controllers: params, strong parameters, filters (before_action), respond_to
9
Views: ERB templates, partials, helpers, layouts, content_for/yield
10
Active Record Query: where, joins, includes, preload, eager_load (N+1 prevention)
11
Rails API mode: API-only applications, serializers (ActiveModel::Serializers, jbuilder)
12
Authentication: Devise gem, has_secure_password, session management, cookies
13
Authorization: Pundit gem, CanCanCan, policies, role-based access control
14
Action Cable: channels, streams, broadcasting, WebSocket connections
15
Active Job: perform_later, queue adapters (Sidekiq), job priorities, retry logic
16
Active Storage: attachments (has_one_attached, has_many_attached), variants, direct uploads
17
Testing: RSpec (describe, context, it), FactoryBot, fixtures, request specs, system tests
18
Concerns: ActiveSupport::Concern, code reusability, module composition
19
Rails engines: mountable engines, namespacing, gem development
20
Performance: fragment caching, Russian doll caching, query optimization, bullet gem
21
Security: CSRF protection, SQL injection prevention, mass assignment protection (strong params)
22
Deployment: Capistrano, Heroku, Docker, Puma/Unicorn servers, assets pipeline
Today's Ruby on Rails challenge
One snippet a day. Find the bug, or prove there isn't one.
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