原书地址：https://www.railstutorial.org/book/beginning
1. 使用cloud 9服务器
https://ide.c9.io
2. 创建一个workspace，进入以后安装rails:
gem install rails -v 4.2.0.beta4
3. 创建一个新的工程：
rails _4.2.0.beta4_ new hello_app
4. 修改Gemfile
source ‘https://rubygems.org‘ gem ‘rails‘, ‘4.2.0.beta4‘ gem ‘sass-rails‘, ‘5.0.0.beta1‘ gem ‘uglifier‘, ‘2.5.3‘ gem ‘coffee-rails‘, ‘4.0.1‘ gem ‘jquery-rails‘, ‘4.0.0.beta2‘ gem ‘turbolinks‘, ‘2.3.0‘ gem ‘jbuilder‘, ‘2.2.3‘ gem ‘rails-html-sanitizer‘, ‘1.0.1‘ gem ‘sdoc‘, ‘0.4.0‘, group: :doc group :development, :test do gem ‘sqlite3‘, ‘1.3.9‘ gem ‘byebug‘, ‘3.4.0‘ gem ‘web-console‘, ‘2.0.0.beta3‘ gem ‘spring‘, ‘1.1.3‘ end
5. install bundle
bundle install
6. 启动服务器
在cloud9上面启动服务器的命令行：
rails server -b $IP -p $PORT
7. 修改app/controllers/application-controller.rb
class ApplicationController < ActionController::Base # Prevent CSRF attacks by raising an exception. # For APIs, you may want to use :null_session instead. protect_from_forgery with: :exception def hello render text: "hello, world!" end end
8. config/routes.rb
代码如下：
Rails.application.routes.draw do . . . # You can have the root of your site routed with "root" root ‘application#hello‘ . . . end
Ruby on Rails 学习笔记 - 1 Hello World
原文：http://www.cnblogs.com/rixin/p/4088745.html