README

• References
• Quick start
• Versions
• Console
• Things to cover

References

• Ruby on Rails
• https://github.com/rails/rails
• https://rubyonrails.org/ → https://d2biiyjlsh52uh.cloudfront.net/rails/rails-8-demo.mp4
  • This is the video I used as a reference to create this repository
  • Kamal and deployment related stuff are not reflected in the evolution of the project

Quick start

From https://github.com/rails/rails:

$ gem install rails
$ rails new rails-playground
$ cd rails-playground
$ ./bin/rails server

./bin/dev can be used instead of ./bin/rails server:

$ cat bin/dev
#!/usr/bin/env ruby
exec "./bin/rails", "server", *ARGV

At this point you can go to http://localhost:3000 in your browser

Using information to the beginnig of https://rubyonrails.org/ → https://d2biiyjlsh52uh.cloudfront.net/rails/rails-8-demo.mp4 scaffold post with title and body:

$ rails generate scaffold post title:string body:text
$ rails db:migrate

At this point you can go to http://localhost:3000/posts in your browser and start using the app.

Versions

From http://localhost:3000/ when ./bin/rails server is running:

• Rails version: 8.0.2
• Rack version: 3.1.16
• Ruby version: ruby 3.2.3 (2024-01-18 revision 52bb2ac0a6) [x86_64-linux-gnu]
  I'm using Linux Mint 22.1

Console

Simple usage example showing and updating the first post:

$ ./bin/rails console
Loading development environment (Rails 8.0.2)
rails-playground(dev)> Post.first
  Post Load (0.1ms)  SELECT "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT 1 /*application='RailsPlayground'*/
=> #<Post:0x00007e098f4daa78 id: 1, title: "p1", body: "p1-body", created_at: "2025-07-05 10:18:35.188633000 +0000", updated_at: "2025-07-05 10:18:35.188633000 +0000">
rails-playground(dev)> Post.first.update! title: "p1 (set by CLI)"
  Post Load (0.3ms)  SELECT "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT 1 /*application='RailsPlayground'*/
  TRANSACTION (0.2ms)  BEGIN immediate TRANSACTION /*application='RailsPlayground'*/
  Post Update (0.9ms)  UPDATE "posts" SET "title" = 'p1 (set by CLI)', "updated_at" = '2025-07-05 10:27:49.768472' WHERE "posts"."id" = 1 /*application='RailsPlayground'*/
  TRANSACTION (3.5ms)  COMMIT TRANSACTION /*application='RailsPlayground'*/
=> true

Things to cover

List originally created by rails new rails-playground command:

• Ruby version
• System dependencies
• Configuration
• Database creation
• Database initialization
• How to run the test suite
• Services (job queues, cache servers, search engines, etc.)
• Deployment instructions
• ...