Rails advantages and techniques

Person.ﬁnd_by_name ‘Jan’

• Jan ‘DefV’ De Poorter • Developer, IT Engineer • Openminds, #1 Rails Hoster in .be • blog.defv.be • Trying to be ﬁrst on google as Jan

Ruby on Rails

Ruby on Rails it does scale

• Framework based on Ruby • Fast, agile development • www.rubyonrails.com

So... Why ? “I already know PHP/.NET/...”

Fast Development

• CRUD • Scaffolding (if you really need to) • DRY • AJAX • acts_as_something

Maintainable

• Very readable code • Implemented documentation system (RDOC) • Tests makes sure you don’t break anything

Model View Controller

Model View Controller • Interface to the database • Business Logic goes here • For the DataBase Admin class User < ActiveRecord::Base has_many :tasks end class Task < ActiveRecord::Base belongs_to :user end

Model View Controller • Link between DB (model) and User (view) • HTTP / Sessions / Cookies / Post / Get • For the Developer class TaskController < ApplicationController def index @tasks = User.find(session[:user_id]).tasks end end

Model View Controller • Web Interface • What the client sees • For the Designer ... <body> <% @tasks.each do |task| %> <div class=’task’> <%= task.content %> is <%= task.status %> </div> <% end %> </body>

Testing

Test-Driven Development

Test-Driven Development • Write tests ﬁrst

Test-Driven Development • Write tests ﬁrst • FAIL

Test-Driven Development • Write tests ﬁrst • FAIL • Implement

Test-Driven Development • Write tests ﬁrst • FAIL • Implement • SUCCEED

Test-Driven Development • Write tests ﬁrst • FAIL • Implement • SUCCEED • Clean Up

Test-Driven Development • Write tests ﬁrst • FAIL • Implement • SUCCEED • Clean Up • Check-In to Version Management

that seems more work?

no

no (but..)

• No, because • No more broken builds • Fix bugs forever • Think before you implement • Small steps • Yes, because • it takes time to learn

Not only for developers!

def test_if_layout_elements_are_present assert_select “body” do assert_select “div.task”, :count => 3 do assert_select “ul” do assert_select “li”, :count => 3 end end end end

is that all ?

No!

polymorphism No!

polymorphism 20.minutes.ago No!

polymorphism 20.minutes.ago 1.gigabyte No!

polymorphism 20.minutes.ago 1.gigabyte No! time_ago_in_words

polymorphism 20.minutes.ago 1.gigabyte No! prototype time_ago_in_words

polymorphism 20.minutes.ago has_and_belongs_to_many 1.gigabyte No! prototype time_ago_in_words

polymorphism 20.minutes.ago has_and_belongs_to_many 1.gigabyte No! cache prototype time_ago_in_words

polymorphism 20.minutes.ago has_and_belongs_to_many 1.gigabyte No! routes cache prototype time_ago_in_words

link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many 1.gigabyte No! routes cache prototype time_ago_in_words

link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte No! routes cache prototype time_ago_in_words

link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte No! routes cache prototype delegate time_ago_in_words

link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte No! routes group_by cache prototype delegate time_ago_in_words

link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte No! routes ﬁnd_by_sql group_by cache prototype delegate time_ago_in_words

link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte REST No! routes ﬁnd_by_sql group_by cache prototype delegate time_ago_in_words

titleize link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte REST No! routes ﬁnd_by_sql group_by cache prototype delegate time_ago_in_words

titleize link_to_remote polymorphism 20.minutes.ago has_and_belongs_to_many <%= debug object %> 1.gigabyte REST No! routes ... ﬁnd_by_sql group_by cache prototype delegate time_ago_in_words

Q &A Examples? Discussion Thank you for listening Jan De Poorter - Openminds

Rails advantages and techniques

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