mashraqi_farhan

Applied Ruby on Rails & AJAX An insight into the technology and principles behind a social networking community

Who am I?
Farhan Mashraqi (Frank Mash)
Developer for 7+ years
MySQL DBA
Community Member
A Recovering PHP Developer
Contact Information:
Business E-mail: [email_address]
Personal E-mail: [email_address]
Personal Blog http://mashraqi.com

What we’ll cover (aka the essentials)
Why ROR?
MVC
Crash Course (Scaffolding etc)
URLs in ROR
Adoppt
AJAXifying Forms
Relationships / Validations

The essentials continued
Transactions
Blog Claims
Tagging
In place editing
Learn more
Q&A

Why would I use Ruby On Rails?
RAD
DRY: “Do not Repeat Yourself”
Disciplined
Normalization
Relationships
Web Services
Everything is an Object

Crash Course [root@srv31 docs]# rails ror create create app/controllers create app/helpers create app/models create app/views/layouts create config/environments create components create db create doc create lib create lib/tasks create log create public/images ... Creating a bare application on Rails [root@srv31 docs]# rails ror

Do it with Scaffolding [root@srv31 ror]# ruby script/generate scaffold user exists app/controllers/ exists app/helpers/ create app/views/users exists test/functional/ dependency model exists app/models/ exists test/unit/ exists test/fixtures/ create app/models/user.rb ruby script/generate scaffold user CRUD = ‘C’reate, ‘R’ead, ‘U’pdate, ‘D’elete

Experience the magic http://localhost:3000/users http://localhost:3000/users/new

Find functions
find_by_[field_name] (field_value)
find_by_[field_name]_and_[field_name]
find_first
find_all_by
find()
find_by_sql(‘SELECT ….’)

URLs in ROR <%= link_to “Reply”, :controller=>”posts”, :action=>“reply”, :id=>4 %>

What is Adoppt
A replicatable social networking platform
Create and participate in communities
Blogs, Forums, Favorites and more

Ajaxifying the login form
Ajaxified version
<%= link_to “Login”, :controller=>”member”, :action=>”login” %> Typical form in ROR <%= link_to_remote “Login”, :url=>{ :controller=>”member”, :action=>”login” }, :update => “loginform”, :loading => “Element.toggle($(‘loading’))”, :complete => “Element.toggle($(‘loading’))” %> Same form ‘AJAXified’

Relationships / Validations
A community
Has many members subscribed
Members can post favorite web sites
Belongs to a member or system
class Portal < ActiveRecord::Base has_many :subscriptions has_many :favorites belongs_to :member validates_presence_of :portal_name validates_presence_of :portal_description validates_presence_of :portal_url validates_uniqueness_of :portal_url … end

HABTM using Subscriptions class Member has_many :subscriptions end class Portal has_many :subscriptions end class Subscription belongs_to :member belongs_to :portal end

Self referential relationships
A member has many friends (member)
Self referential HABTM relationship
class Member < ActiveRecord::Base has_and_belongs_to_many :friends, : class_name => "Member", : join_table => "friends_members", : association_foreign_key => "friend_id", : foreign_key => "member_id", : after_add => :become_friend_with_friend, : after_remove => :end_friendship end

Using relationships
1. Which favorites were posted to a portal
@portal = Portal.new @favorites = @portal.favorites 2. Which members are subscribed? @portal = Portal.new @members = @portal.subscriptions @member = Member.new @member_portals = @member.portals 3. Which portals a member is subscribed to? 4. Which members are friends of a member? @member = Member.new @friends = @member.friends

Transactions (InnoDB) Member.transaction(@member, @friend) do @member.friends << @friend unless @member.friends.include?(@friend) @friend.friends << @member unless @friend.friends.include?(@member) end

Blog Claims def claim_verify @wb= Weblog.find_by_url(@params[:url]) require 'open-uri‘ @found = open(@wb.url).read.include?(@wb.v_key) end

Tagging
acts_as_taggable gem (http://taggable.rubyforge.org/)

Tagging class Article < ActiveRecord::Base acts_as_taggable :join_class_name => ' TagArticle ‘ class TagArticle belongs_to :article, :class_name => ' Article ', :foreign_key => 'article_id‘ @tagged = Article.tags_count(:limit => 10) Tagging an article @article = Article.new @article.tag “mysql conference ror” Tags for an article @tags = @article.tags() Tag Cloud (Tom Fakes)

In place editing class BlogsController < ApplicationController in_place_edit_for :weblog, :description <%= in_place_editor_field :weblog, :description, :value=>'' %> In your views file In your model

Recap
ROR: Valuable to You

Where to learn more
Books
Agile Web Development with Rails by Dave Thomas and David Heinemeier Hansson
Pro Rails by me
ROR Recipes by Chad Fowler
Websites
http://www.ruby-doc.org/
http://www.rubygarden.org/ruby/
http://www.ruby-lang.org/
http://www.ruby-doc.org/stdlib/libdoc/rdoc/rdoc/index.html
http://script.aculo.us
http://rubyonrails.adoppt.com/blog/frank

mashraqi_farhan

by webuploader on Oct 10, 2007

Accessibility

Categories

Upload Details

Usage Rights

Statistics

mashraqi_farhan Presentation Transcript