1. Create new projects

1. 检查版本
   ruby -v
rails -v
2. 创建文件夹
   mkdir Workbook
cd Workbook
3. 创建rails框架专案
   rails new first_app
cd first_app
bundle install
   打开rails s
   http://localhost:3000
4. 保存
   git init
git status
git add .
git commit -m "Added all the things"

2. Create scaffold

1. 使用scaffold快速搭建topic
   rails generate scaffold topic title:string description:text
rake db:migrate
   重开rails s
   http://localhost:3000/topics
2. 保存
   git add .
git commit -m "add README"