Ruby On Rails上手笔记（安装使用全过程）

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

gem install rails

没有的话应该这样：

sudo gem install rails

安装rvm可以用句

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

查看rails版本

rails -v
rails 4.0.3

似乎这就是当前的最新版本

ruby版本

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

brew install sqlite3

其他可以看情况安装，如opensuse

sudo zypper install sqlite3

rails 4 hello,world

可以直接用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.

运行rails

$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：

$rails generate controller welcome index

就会创建下面这些文件：

  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

root 'welcome#index'

再运行

rails server

就会出现

welcome#index

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

一切来得很快，很突然。