有机会再试一试Rails了，只是原来接触的是2，现在已然变成了4，似乎现在的安装比原来会快些。。

Rails 4 安装

针对于安装了RVM

复制代码 代码如下:gem install rails

没有的话应该这样：

复制代码 代码如下:sudo gem install rails

安装RVM可以用句

复制代码 代码如下:curl -L https://get.rvm.io | bash -s stable

查看rails版本

复制代码 代码如下:rails -v

Rails 4.0.3

似乎这就是当前的最新版本

Ruby版本

复制代码 代码如下: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

安装SQLite

似乎这就是诸如Django、Rails这类对于轻量级网站的数据库要求。

如果是mac os

复制代码 代码如下:brew install sqlite3

其他可以看情况安装，如openSUSE

复制代码 代码如下:sudo zypper install sqlite3

Rails 4 Hello,World

可以直接用rails生成

复制代码 代码如下:$rails new hello

于是就有了

复制代码 代码如下:

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

复制代码 代码如下:

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.

运行Rails

复制代码 代码如下: $rails server

这样的话打开 http://localhost:3000 就可以看到,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

执行命令：

复制代码 代码如下:$rails generate controller welcome index

就会创建下面这些文件：

复制代码 代码如下:

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添加默认页面

复制代码 代码如下:root 'welcome#index'

再运行

复制代码 代码如下:rails server

就会出现

复制代码 代码如下:Welcome#index

Find me in app/views/welcome/index.html.erb

一切来得很快，很突然。