Rails application in one file

code:Gemfile

gem 'rails'

gem 'puma'

code:ruby

require 'action_controller/railtie'

class MyApp < Rails::Application

config.eager_load = true # necessary to silence warning

config.logger = ActiveSupport::TaggedLogging.new(Logger.new(STDOUT))

config.secret_key_base = SecureRandom.uuid # Rails won't start without this

routes.append { root :to => "hello#index" }

end

class HelloController < ActionController::Base

def index

render json: { message: 'hello' }

end

end

MyApp.initialize!

run MyApp

2022年版

code:ruby

# frozen_string_literal: true

require 'bundler/inline'

gemfile(true) do

gem 'rails', '~> 7.0.4'

gem 'sqlite3'

end

require 'rails/all'

database = 'development.sqlite3'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: database)

ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do

create_table :posts, force: true do |t|

end

create_table :comments, force: true do |t|

t.integer :post_id

end

end

class App < Rails::Application

config.root = __dir__

config.consider_all_requests_local = true

config.secret_key_base = 'i_am_a_secret'

config.active_storage.service_configurations = { 'local' => { 'service' => 'Disk', 'root' => './storage' } }

routes.append do

root to: 'welcome#index'

end

end

class WelcomeController < ActionController::Base

def index

render inline: 'Hi!'

end

end

App.initialize!

run App