Resource and view

Fitting for the occasion

MeetUP @ Balabit

October 14, 2010
nucc@balabit.com

Rails 3.0

• Merb + Rails 2.3 = Rails 3.0
• Bundler
• Rack
• HTML 5
• Arel

Rails 3.0

• Merb + Rails 2.3 = Rails 3.0
users
.where(users[:name].eq('nucc'))
• Bundler
.project(users[:id])
# => SELECT users.id FROM users WHERE users.name = 'nucc'
• Rack
users.where(users[:name].eq('bob')).where(users[:age].lt(25))
#•=> SELECT * FROM users where users.name=’bob’ and users.age < 25
HTML 5
• Arel
users.where(users[:name].eq('bob').or(users[:age].lt(25)))
# => SELECT * FROM users where users.name=’bob’ or users.age < 25

valid_users = users.where(users[:valid].eq(1))
men = valid_users.where(users[:sex].eq(1))
women = valid_users.where(users[:sex].eq(2))
number_of_women = women.count()

Sharing information

Product Products
Model Controller

REST

• Representational State Transfer

• Roy Fielding - 2000
• SOAP is a protocol, REST is an architecture
• Representation of a resource
• iWiW, Facebook, GitHub, Twitter, Google Search

REST Mapping

Verb Path Action
GET /products index
GET /products/:id show
POST /products create
GET /products/:id/edit edit
PUT /products/:id update
DELETE /products/:id delete

Configuration
/app/models/product.rb /app/controllers/products_controller.rb
class Product < ActiveRecord::Base class Products < ApplicationController
end
def index
@products = Product.all
end

def show
@product = Product.ﬁnd params[:id]
end

conﬁg/routes.rb def update
...
Meetup::Application.routes.draw do |map|
end
resources :products
...
end
end

Using resource
/app/models/user.rb
class User < ActiveResource::Base
site.url = “http://api.twitter.com”
end

/app/controller/user_controller.rb
class UserController < ActionController::Base
self.site = “http://api.twitter.com”

self.element_name = “user”
self.proxy = “...”
self.timeout = 5
self.ssl_options = { :key => “...” }
end


Product Product
Model Controller


HTTP
Product Product
Model Controller
Android UI / XML

iPhone UI / XML

XML

JSON

Respond to
class ProductsController < Application
def index
@products = Product.all

respond_to do |format|
format.html # index.html.erb
format.iphone # index.iphone.erb
format.json { render :json => @products }
format.xml { render :xml => @products}
end
end
end


Product /products.html
Product
Model Controller
/products.xml

/products.iphone

/products.rss

/products.js

Review

/app/models
/app/controllers

/app/views
/app/helpers

Rendering
render :xml => @products
render :json => @products
render :ﬁle => “../owners/owner.html.erb”
render :text => “Hello World”

render :update do |page|
page.replace_html(“products”, :partial => product, :object=> @product)
end

Views
Layout
:header

content

index.html.erb
:menu product #1

product #2

product #3

:footer

Layout
# layout.html.erb # index.html.erb
<html>
<body> <%= content_for :header do %>
<div class=”header”> <span> BALABIT Products </span>
<%= yield :header %> <% end %>
</div>
<div class=”content”> <%= content_for :menu do %>
<div class=”menu”> <li>Special menu item</li>
<%= yield :menu %> <% end %>
</div>
</div>
<div class=”products”>
<div class=”content”> ...
<%= yield %> </div>
</div>

...

Partial

/app/views/products/index.html.erb
content #object
render :partial => “product”, :object => ...
product #1
#array
render :partial => “product”, :collection => ...
product #2

product #3

/app/views/products/_product.html.erb

Partial
# /app/views/products/index.html.erb
<%= render :partial => “product”, :collection => @products %>
/app/views/products/index.html.erb
</div>

content # /app/views/products/_product.html.erb
#object
<div class=”product”>
<span class=”title”><%= product.name %></span> =>
render :partial => “product”, :object ...
product #1 <span class=”owner”><%= product.owner %></span>
</div>#array
render :partial => “product”, :collection => ...
product #2 # result
<div class=”product”>
product #3 <span class=”title”>SCB</span>
<span class=”owner”>Marci</span>
</div>
</div>
/app/views/products/_product.html.erb

Helpers

/app/views/products/index.html.erb /app/helpers/products_helper.rb
<div> module ProductsHelper
<span> Number of products: </span>
<%= number_of_products(@product) %> def number_of_products( products )
<div> products.select{ |p| p.active? }.size
end
<% form_for @product, :remote => true do | f | %>
<%= f.text_ﬁeld :version %> end
<% end %>

Cache
class ProductController < Application class ProductController < Application
before_ﬁlter :authentication
caches_page :index caches_action :index

def index def index
@products = Product.all @products = Product.all
end end

def create def create
expire_page :action => :index expire_page :action => :index
... ...
end end
... ...
end end

Cache
<html>
<body>

<% cache do %>
<div class=”menu”>
<li>Show products</li>
</div>
<% end %>

<% cache(:action => 'update', :action_sufﬁx => 'products') do %>
<%= render :partial => “product”, :collection => @products %>
</div>
<% end %>

# expire_fragment( :controller => ‘products’, :action => 'index', :action_sufﬁx => 'products')

Resource and view

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (8)

Similar to Resource and view

Similar to Resource and view (20)

Recently uploaded

Recently uploaded (20)

Resource and view