rbenv install ruby-3.4.2 # Or whatever the latest stable version is
rbenv global ruby-3.4.2

gem install bundler
gem install rails
rbenv rehash

mkdir auth_service && cd auth_service

bundle init

bundle exec rails new . --api -d mysql --skip-bundle

bundle config --local build.mysql2 \
  "--with-ldflags=-L/opt/homebrew/opt/zstd/lib \
   --with-cppflags=-I/opt/homebrew/opt/zstd/include \
   --with-mysql-config=$(brew --prefix mysql)/bin/mysql_config"

bundle install

• update the config/database.yml

default: &default
  adapter: mysql2
  encoding: utf8mb4
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  username: <%= ENV.fetch("DB_USERNAME", "root") %>
  password: <%= ENV.fetch("DB_PASSWORD", "password") %>
  host: <%= ENV.fetch("DB_HOST", "127.0.0.1") %>
  
development:
  <<: *default
  database: <%= ENV.fetch("DB_NAME", "auth_service_development") %>

test:
  <<: *default
  database: auth_service_test

production:
  primary: &primary_production
    <<: *default
    database: auth_service_production
    username: auth_service
    password: <%= ENV["AUTH_SERVICE_DATABASE_PASSWORD"] %>
  cache:
    <<: *primary_production
    database: auth_service_production_cache
    migrations_paths: db/cache_migrate
  queue:
    <<: *primary_production
    database: auth_service_production_queue
    migrations_paths: db/queue_migrate
  cable:
    <<: *primary_production
    database: auth_service_production_cable
    migrations_paths: db/cable_migrate

bundle exec rails db:create

bundle exec rails s

✅ Features to Include

User Registration

User Login with JWT

Authenticated User Info (Profile)

Token-based Auth with Authorization: Bearer

Basic validations and error handling

🚀 Gems to Add to Gemfile

# Gemfile

gem 'bcrypt', '~> 3.1.7'
gem 'jwt'

run

bundle install

🏗️ Generate User Model and Controller

rails g model User name:string email:string password_digest:string
rails g controller Api::V1::Auth

update app/models/user.rb

Then run:

rails db:migrate

ruby -rsecurerandom -e 'puts SecureRandom.hex(64)'

EDITOR="nano" rails credentials:edit

update app/controllers/api/v1/auth_controller.rb app/controllers/application_controller.rb app/lib/json_web_token.rb config/routes.rb

for logs similar to python print as "Rails.logger.info("Decoded token: #{decoded}")"

incase no db required

bundle exec rails new . --api --skip-active-record --skip-bundle

• frontend

rails new frontend_service --css=tailwind

bin/dev

docker-compose --env-file .env up --build -d

• will automate it later

bundle lock --add-platform x86_64-linux

docker-compose exec auth_service bundle exec rails db:create db:migrate

• blazer

mkdir blazer_dashboard && cd blazer_dashboard

bundle init

bundle exec rails new . -d mysql --skip-bundle

bundle config --local build.mysql2 \
  "--with-ldflags=-L/opt/homebrew/opt/zstd/lib \
   --with-cppflags=-I/opt/homebrew/opt/zstd/include \
   --with-mysql-config=$(brew --prefix mysql)/bin/mysql_config"

bundle install

bundle exec rails db:create

rails generate blazer:install

rails db:migrate

rails generate model Product name:string price:decimal
rails db:migrate

in db/seed.rb

10.times do
  Product.create!(
    name: ["Phone", "Laptop", "Tablet", "Camera"].sample,
    price: rand(100..2000)
  )
end

rails db:seed

now visit http://localhost:3005/blazer/queries/new

and run in query

SELECT name, AVG(price) AS avg_price
FROM products
GROUP BY name