Ruby on Rails 学习笔记 - 1 Hello World

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