ruby on rails training session #2: 1) how to add login/logout/signup functions; 2) a functional/unit test; 3) simple ajax to post a weibo.

1. More to RoC Weibo

2. Login/Logout, Sign Up
$ rails g resource user email:string name:string password:string
$ rails g controller sessions

3. Model
User (email, name, password...)
Controller Controller
SessionsCotnroller UsersController
(Login/Logout) (Sign Up)

4. Model
app/models/user.rb
class User < ActiveRecord::Base
validates_presence_of :email, :password
validates_confirmation_of :password
has_many :messages
has_many :replies
end

5. Migration
db/migrate/yyyyMMddhhmmss_create_users.rb
class CreateUsers < ActiveRecord::Migration
def self.up
create_table :users do |t|
t.string :email
t.string :name
t.string :password
t.timestamps
end
end
def self.down
drop_table :users
end
end

6. Sign Up
app/controllers/users_controller.rb
class UsersController < ApplicationController
def new # show the sign up page
end
def create # register a new user
end
end

7. Login/Logout
app/controllers/sessions_controller.rb
class SessionsController < ApplicationController
def destroy # logout
end
def create # login
end
end

8. A little about RESTful
create v.s. register/login
destroy v.s. logout

9. • Controller Resource
• Resource operations:
• Create, Read, Update, Delete
• Only 7 actions:
• index, new, create (C), edit, update (U),
show (R), destroy (D)

10. Login Create a Session
Logout Destroy a Session
Sign Up Create a User

11. To be RESTFul, (controllers)

12. http://www.slideshare.net/shaokun/rest-ruby-on-rails

13. Migration
$ rails g migration add_user_id_to_messages_replies
$ rake db:migrate

14. class AddUserIdToMessagesReplies < ActiveRecord::Migration
def self.up
add_column :messages, :user_id, :integer
add_column :replies, :user_id, :integer
end
def self.down
remove_column :messages, :user_id
remove_column :replies, :user_id
end
end

15. Validations

16. class User < ActiveRecord::Base
validates_presence_of :email, :password
validates_confirmation_of :password,
:message => "should match confirmation"
end
<%= password_field "user", "password" %>
<%= password_field "user", "password_confirmation" %>

17. class User < ActiveRecord::Base
validates_exclusion_of :age,
:in => 30..60, :message => "This site is only for under 30 and over 60"
validates_format_of :email,
:with => /A([^@s]+)@((?:[-a-z0-9]+.)+[a-z]{2,})Z/i
end

18. • http://api.rubyonrails.org/
• validates_acceptance_of
• validates_confirmation_of
• validates_exclusion_of
• validates_format_of
• validates_inclusion_of
• validates_length_of
• validates_numericality_of
• validates_presence_of

19. AJAX

20. View
<%= form_for(@message) do |f| %>
...
<% end %>
<%= form_for(@message, :remote => true) do |f| %>
...
<% end %>

21. Controller
def create
respond_to do |format|
format.html { redirect_to(messages_url) }
format.js {
render :update do |page|
...
end
}
end
end

22. Functional/Unit Test

23. • $ rake db:test:clone_structure
• $ rake test
• $ ruby -Itest test/unit/user_test.rb
• $ ruby -Itest test/unit/user_test.rb -n TEST_CASE_METHOD_NAME

24. require 'test_helper'
class UsersControllerTest < ActionController::TestCase
test "should create a new user" do
assert_difference("User.count", +1) do
post :create, :user => {
:email => "shaokun.wu@gmail.com",
:password => "a"
}
assert_redirected_to root_path
end
end
end

25. require 'test_helper'
class UserTest < ActiveSupport::TestCase
test "should set the name through email" do
user = User.new(:email => "shaokun.wu@gmail.com", :password => "a")
assert user.save
assert_equal "shaokun.wu", user.name
end
end

26. Deploy
App

27. • PHP/ASP Upload
• 200 /
• Sina App Engine
• Rails
• VPS: linode.com, AWS EC2

28. Heroku
http://heroku.com

29. • $ gem install heroku
• $ heroku create roc-demo2
• $ heroku keys:add
• $ git remote add heroku git@heroku.com:roc-demo2.git
• $ git push heroku master
• $ heroku rake db:migrate

30. C:Sitesroc-demo2>git push heroku master
Counting objects: 313, done.
Compressing objects: 100% (185/185), done.
Writing objects: 100% (313/313), 7.74 MiB | 15 KiB/s, done.
Total 313 (delta 123), reused 232 (delta 94)
-----> Heroku receiving push
-----> Rails app detected
-----> Detected Rails is not set to serve static_assets
Installing rails3_serve_static_assets... done
-----> Configure Rails 3 to disable x-sendfile
Installing rails3_disable_x_sendfile... done
-----> Configure Rails to log to stdout
Installing rails_log_stdout... done
-----> Gemfile detected, running Bundler version 1.0.7
Unresolved dependencies detected; Installing...
Using --without development:test
Fetching source index for http://rubygems.org/
Installing rake (0.8.7)
...
Your bundle is complete! It was installed into ./.bundle/gems/
-----> Compiled slug size is 3.7MB
-----> Launching... done, v4
http://roc-demo2.heroku.com deployed to Heroku
To git@heroku.com:roc-demo2.git
* [new branch] master -> master

31. Let’s code...

32. • Get the code:
http://github.com/kudelabs/roc-demo2
• See it in action:
http://demo2.railsoncampus.com
• keep in touch:
@railsoncampus
http://weibo.com/1944841390