new_rails_app.md

Prerequisites

Verify latest Ruby version

Ruby downloads

Check local Ruby version (CLI)

$ ruby -v

If necessary, upgrade Ruby (CLI)

$ rvm get stable
$ rvm install ruby-3.0.2

Check Rails version (CLI)

$ rails -v
$ gem list rails --remote -e

If necessary, upgrade Rails (CLI)

$ gem update rails

For a specific Rails version

• See all Rails versions: https://rubygems.org/gems/rails/versions
• Install a specific Rails version: gem install rails -v 5.2.5

---

Default (rspec, postgres, haml)

CLI

$ rails new my-app --skip-bundle -T --database=postgresql

Gemfile

# Use haml instead of erb
gem 'haml-rails'

group :development, :test do
  # Use rspec instead of minitest
  gem 'rspec-rails'
end

Read Ruby version from file

ruby file: ".ruby-version"

CLI

$ bundle install
$ rails haml:erb2haml
$ rails g rspec:install
$ rails webpacker:install
$ git add .
$ git commit -m "Initial commit"
$ rails db:create
$ rails s

---

Basic

$ rails new my-app

With rspec (no tests)

$ rails new my-app -T
# gem 'rspec-rails'
$ bundle install
$ rails g rspec:install

With postgres

$ rails new my-app --database=postgresql

With mongodb

https://gist.github.com/randallreedjr/bfe8e752fb992dba16b5318dbea1e443

With no database

# Rails 5
$ rails new my-app --skip-active-record
# Rails 4
$ rails new my-app --skip-activerecord

API only

$ rails new my-app --api