ride on the fast track of web with ruby on rails- part 2

Ruby on RailsTechnology

MVC

ModelController

View

MVC

●

ControllerModel

●View

MVC

RESTful routing

RESTRepresentational state transfer

RESTful routingHTTP Verb Path Action

GET /posts index

GET /posts/new new

POST /posts create

GET /posts/:id show

GET /posts/:id/edit edit

PUT /posts/:id update

DELETE /posts/:id destroy

RESTful routing

resources :posts

Configuration

Model

class Post < ActiveRecord::Base validates :title, :presence => trueend

Controller

class PostController < ApplicationController

def index @posts = Post.all logger.info 'Post loaded' end

end

View<h1>Listing posts</h1> <table> <tr> <th>Name</th> <th>Title</th> <th>Content</th> </tr> <% @posts.each do |post| %> <tr> <td><%= post.name %></td> <td><%= post.title %></td> <td><%= post.content %></td> </tr><% end %></table>

Technology● Unobtrusive Javascript● Built in jquery and prototype● Coffeescript● HTML 5● Haml / Sass● Internationalization● Data migration● Dependency management

PerformanceImprove performance● Caching● Asset pipeline

Test performance

Improve performanceCaching

- Page caching

- Action caching

- Fragment Caching

● Reference● http://guides.rubyonrails.org/caching_with_rails.html

Configuration

config.action_controller.perform_caching = true

Page caching

class ProductsController < ActionController caches_page :index def index @products = Products.all end def create expire_page :action => :index endend

Page caching

Appropriate for● Public pages● Pages that do not

change often

Not for● Pages that require

authentication● Pages that changes

often

Action caching

class ProductsController < ActionController before_filter :authenticate caches_action :index def index @products = Product.all end def create expire_action :action => :index endend

Fragment caching

<% cache('all_available_products') do %> All available products: <% Product.all.each do |p| %> <%= link_to p.name, product_url(p) %> <% end %><% end %>

expire_fragment('all_available_products')

Expire cach

In template

Caching

Use Sweepers to expire cache

Sweepers to expire caching

class ProductSweeper < ActionController::Caching::Sweeper observe Product # This sweeper is going to keep an eye on the Product model

def after_create(product) expire_cache_for(product) end def after_update(product) expire_cache_for(product) end def after_destroy(product) expire_cache_for(product) end private def expire_cache_for(product) expire_page(:controller => 'products', :action => 'index') expire_fragment('all_available_products') endend

Sweepers to expire caching

class ProductsController < ActionController before_filter :authenticate caches_action :index cache_sweeper :product_sweeper def index @products = Product.all end end

Configure caching

ActionController::Base.cache_store = :memory_storeor

ActionController::Base.cache_store = :file_store, "/path/to/cache/directory"or

ActionController::Base.cache_store = :mem_cache_store, "cache-1.example.com"

Test performance● Benchmarking web site performance●

http://guides.rubyonrails.org/performance_testing.html

class HomepageTest < ActionDispatch::PerformanceTest # Replace this with your real tests. def test_homepage get '/' endend

Improve performance

Asset pipeline ???

● Reference● http://guides.rubyonrails.org/asset_pipeline.html

Asset pipelining

Asset pipelining

Assets

Asset pipelining

Com

p ile

Assets

Compiled asset

Asset pipelining

Assets

Compiled asset

Usage

app/assets/javascripts/application.jsapp/assets/javascripts/home.jsapp/assets/javascripts/menu.jsapp/assets/javascripts/slider.js

Asset pipelining

Assets

Compiled asset

UsageIn application.js add the following,

//= require home//= require moovinator//= require slider

Asset pipelining

Assets

Compiled asset

UsageAdd application.js in you template as follows,

<%= javascript_include_tag "application" %>

Deployment

Assets

Compiled asset● Reference● https://github.com/capistrano/capistrano/wiki

● Using capistrano magic●

● cap deploy

Learn Rails

Assets

Compiled asset

● Guides● http://guides.rubyonrails.org●

● Video casts● http://railscasts.com● http://rubyonrails.org/screencasts

A.K.M. Ashrafuzzaman Sr. Technology Analyst,

Orbund

www.ashrafuzzaman.comjitu-blog.blogspot.comwww.orbund.com

http://www.softexpo.com.bd/technical_details.php?id=9To see 1st part of this presentation visit:http://www.slideshare.net/fuadcse/ride-on-the-fast-track-of-web-with-ruby-on-rails-part-1

Presented At