dotenv-rails comments

# Gemfile
gem 'dotenv-rails'

bundle install

# config/application.rb
Bundler.require(*Rails.groups)
Dotenv::Railtie.load

touch .env

# .env
DB_HOST=localhost
DB_USERNAME=admin
DB_PASSWORD=secretpassword

# config/database.yml
development:
  host: <%= ENV['DB_HOST'] %>
  username: <%= ENV['DB_USERNAME'] %>
  password: <%= ENV['DB_PASSWORD'] %>

rails server

# app/models/user.rb
class User < ApplicationRecord
  def self.connect
    connection = ActiveRecord::Base.connection
    # Use connection for database operations
  end
end