Rails 7 on Docker demo application

This app demonstrates Rails 7 with PostgreSQL, import maps, turbo, stimulus and hotwire, all running in Docker.

NOTE: There is also an example Rails 6 application working in Docker with Webpacker

Features

• Rails 7 alpha
• Dockerfile and Docker Compose configuration
• PostgreSQL database
• Redis
• GitHub Actions for tests, linters, and security checks
• Dependabot for automated updates

Initial setup

docker compose build
docker compose run --rm web bin/rails db:setup

Running the Rails app

docker compose up

Running the Rails console

When the app is already running with docker-compose up, attach to the container:

docker compose exec web bin/rails c

When no container running yet, start up a new one:

docker compose run --rm web bin/rails c

Running tests

docker compose run --rm web bundle exec rspec

Updating gems

docker compose run --rm web bundle update
docker compose up --build

Credits/References

Rails with Docker

• https://docs.docker.com/compose/rails/
• https://pragprog.com/book/ridocker/docker-for-rails-developers
• https://evilmartians.com/chronicles/ruby-on-whales-docker-for-ruby-rails-development

Rails 7 with importmaps

• Alpha preview: Modern JavaScript in Rails 7 without Webpack

Rails 7 with hotwire

• Stimulus 3 + Turbo 7 = Hotwire 1.0
• Turbo 7
• Rails 7 will have three great answers to JavaScript in 2021+
• Hotwire Turbo Replacing Rails UJS