Ruby On Rails 4 hello world,Ruby On Rails上手

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

 gem install rails

没有的话应该主

sudo gem install rails

安装RVM能够用

 \curl -L https://get.rvm.io | bash -s stable

查看rails版本号

 rails -v

Rails 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

 brew install sqlite3

其它能够看情况安装，如openSUSE

 sudo zypper install sqlite3

Rails 4 Hello,World

能够直接用rails生成

$rails new hello

于是就有了

  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

  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

 $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

$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)

  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

 rails server

就会出现

Welcome#index

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

一切来得非常快，非常突然

巴特西