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有机会再试一试Rails了，仅仅是原来接触的是2，如今已然变成了4，似乎如今的安装比原来会快些。。
Rails 4 安装
针对于安装了RVM
代码语言：javascript复制 gem install rails没有的话应该主
代码语言：javascript复制sudo gem install rails安装RVM能够用
代码语言：javascript复制 curl -L https://get.rvm.io | bash -s stable查看rails版本号
代码语言：javascript复制 rails -vRails 4.0.3
似乎这就是当前的最新版本号
Ruby版本号
We recommend Ruby 2.1.0 for use with Rails. We stopped supporting Ruby 1.8.x after Rails 3.2. Ruby 1.9.2 will be supported until Rails 5.
官方推荐用2.1.0. 也就是最新版本号
安装SQLite
似乎这就是诸如Django、Rails这类对于轻量级站点的数据库要求。
假设是mac os
代码语言：javascript复制 brew install sqlite3其它能够看情况安装，如openSUSE
代码语言：javascript复制 sudo zypper install sqlite3Rails 4 Hello,World
能够直接用rails生成
代码语言：javascript复制$rails new hello于是就有了
代码语言：javascript复制 create
create README.rdoc
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
create app/assets/javascripts/application.js
create app/assets/stylesheets/application.css
create app/controllers/application_controller.rb
create app/helpers/application_helper.rb
create app/views/layouts/application.html.erb
create app/assets/images/.keep
create app/mailers/.keep
create app/models/.keep
create app/controllers/concerns/.keep
create app/models/concerns/.keep
create bin
create bin/bundle
create bin/rails
create bin/rake
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/backtrace_silencers.rb
create config/initializers/filter_parameter_logging.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.rb
create config/initializers/secret_token.rb
create config/initializers/session_store.rb
create config/initializers/wrap_parameters.rb
create config/locales
create config/locales/en.yml
create config/boot.rb
create config/database.yml
create db
create db/seeds.rb
create lib
create lib/tasks
create lib/tasks/.keep
create lib/assets
create lib/assets/.keep
create log
create log/.keep
create public
create public/404.html
create public/422.html
create public/500.html
create public/favicon.ico
create public/robots.txt
create test/fixtures
create test/fixtures/.keep
create test/controllers
create test/controllers/.keep
create test/mailers
create test/mailers/.keep
create test/models
create test/models/.keep
create test/helpers
create test/helpers/.keep
create test/integration
create test/integration/.keep
create test/test_helper.rb
create tmp/cache
create tmp/cache/assets
create vendor/assets/javascripts
create vendor/assets/javascripts/.keep
create vendor/assets/stylesheets
create vendor/assets/stylesheets/.keep
run bundle install接着会安装包依赖
代码语言：javascript复制 Fetching gem metadata from https://rubygems.org/..........
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.3.1)
Using i18n (0.6.9)
Using minitest (4.7.5)
Using multi_json (1.9.2)
Using thread_safe (0.3.3)
Using tzinfo (0.3.39)
Using activesupport (4.0.3)
Using builder (3.1.4)
Using erubis (2.7.0)
Using rack (1.5.2)
Using rack-test (0.6.2)
Using actionpack (4.0.3)
Using mime-types (1.25.1)
Using polyglot (0.3.4)
Using treetop (1.4.15)
Using mail (2.5.4)
Using actionmailer (4.0.3)
Using activemodel (4.0.3)
Using activerecord-deprecated_finders (1.0.3)
Using arel (4.0.2)
Using activerecord (4.0.3)
Using bundler (1.5.3)
Using coffee-script-source (1.7.0)
Using execjs (2.0.2)
Using coffee-script (2.2.0)
Using thor (0.19.1)
Using railties (4.0.3)
Using coffee-rails (4.0.1)
Using hike (1.2.3)
Using jbuilder (1.5.3)
Using jquery-rails (3.1.0)
Using json (1.8.1)
Using tilt (1.4.1)
Using sprockets (2.11.0)
Using sprockets-rails (2.0.1)
Using rails (4.0.3)
Using rdoc (4.1.1)
Using sass (3.2.19)
Using sass-rails (4.0.3)
Using sdoc (0.4.0)
Using sqlite3 (1.3.9)
Using turbolinks (2.2.2)
Using uglifier (2.5.0)
Your bundle is complete!
Use `bundle show [gemname]` to see where a bundled gem is installed.执行Rails
代码语言：javascript复制 $rails server这种话打开 http://localhost:3000 就能够看到,Rails的欢迎界面Welcome aboard，有点类似于Django-CMS的小马哥~~
创建controller
如官方指南所说http://guides.rubyonrails.org/getting_started.html
运行命令
代码语言：javascript复制$rails generate controller welcome index就会创建以下这些文件(Ruby On Rails 4 hello world,Ruby On Rails上手)
代码语言：javascript复制 create app/controllers/welcome_controller.rb
route get "welcome/index"
invoke erb
create app/views/welcome
create app/views/welcome/index.html.erb
invoke test_unit
create test/controllers/welcome_controller_test.rb
invoke helper
create app/helpers/welcome_helper.rb
invoke test_unit
create test/helpers/welcome_helper_test.rb
invoke assets
invoke coffee
create app/assets/javascripts/welcome.js.coffee
invoke scss
create app/assets/stylesheets/welcome.css.scss 在config/routes.rb加入�默认页面
root 'welcome#index'再执行
代码语言：javascript复制 rails server就会出现
代码语言：javascript复制Welcome#index
Find me in app/views/welcome/index.html.erb一切来得非常快，非常突然
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