1，修改routes文件，让所有的action都可以使用get或者post方式访问
match "/:controller/:action" => "controller#action" , via: [:get, :post]
2，创建一个数据库表user
$ rails g scaffold user name:string hashed_password:string salt:string
输出内容：
invoke active_record
create db/migrate/20131102121128_create_users.rb
create app/models/user.rb
invoke test_unit
create test/models/user_test.rb
create test/fixtures/users.yml
invoke resource_route
route resources :users
invoke scaffold_controller
create app/controllers/users_controller.rb
invoke erb
create app/views/users
create app/views/users/index.html.erb
create app/views/users/edit.html.erb
create app/views/users/show.html.erb
create app/views/users/new.html.erb
create app/views/users/_form.html.erb
invoke test_unit
create test/controllers/users_controller_test.rb
invoke helper
create app/helpers/users_helper.rb
invoke test_unit
create test/helpers/users_helper_test.rb
invoke jbuilder
create app/views/users/index.json.jbuilder
create app/views/users/show.json.jbuilder
invoke assets
invoke coffee
create app/assets/javascripts/users.js.coffee
invoke scss
create app/assets/stylesheets/users.css.scss
invoke scss
identical app/assets/stylesheets/scaffolds.css.scss
$ rake db:migrate