Ruby on Rails

Webdevelopment wordt weer leuk!

2006

Ruby

Yukihiro Matsumoto

Japan, 1993 …

Ruby

=

object oriented

Class.class

Time.now - 1.day

5.times {print “Hello world!"}

['toast','cheese', 'wine'].each {

|food| print food.capitalize }

Ruby

=

interpreted

Ruby

=

dynamic

metaprogramming / DSL’s

metaprogramming / DSL’s

Filosofie achter Rails

productiviteit

happiness

productiviteit

Optimize forprogrammerhappiness

flow

happiness

productiviteit

Flow = Geen besef van tijd en jezelf meer

Flow = Directe feedback

programmeur

programmeur

Rails:

Change = instant

Flow = Balans vaardigheden en uitdaging

Full-stack MVC framework

Principes

Convention over configuration

Less and more beautiful code

DRY

Flow = Intrinsieke motivatie

flow

happiness

productiviteit

Demo

(eindelijk … )

project structuur(conventions over configuration)

Datamodel demo

Commentsbodycreated_at

1 0..*

Articletitlebodycreated_at

Java Model (Hibernate)

<hibernate-mapping>

<class name="models.Article" table=“ARTICLES">

<id name="id" column="id" type="java.lang.Long">

<generator class="identity"/>

</id>

<property name=“body " column=“body"/>

<property name=“description“ column=“description"/>

<set name=“comments" table=“COMMENTS”>

<key column="id"/>

<one-to-many class="models.Comments"/>

</set>

</class>

</hibernate-mapping>

Article.hbm.xml

public class Article{

private Long id;

private String title;

private String body;

private Set comments;

public Set getComments() {

return markets;

}

public void setComments(Set comments){

this.comments = comments;

}

// getters en setters van andere

// properties

}

Article.java

+ configuratie (o.a. Hibernate)

Rails model

beautiful, agile ...

migrations(tegen de migraine)

unit tests(zijn ingebakken)

Scaffolding

Sagrada Familia (Gaudi), Barcelona

Controller

articles_controller.rb:

class ArticlesController < ApplicationController

def show

@article = Article.find(params[:id])

end

end

URL

http://localhost:3000/articles/show/2

View

app/views/articles/show.rhtml

validations(when you do it, do it safe)

Ajax(it’s magic)

RESTful webservices(constraints are liberating)

Maar?

Schaalt het?

> 500.000 requests / dag> 100.000 users> Draait op 3 servers

11000 requests / seconde!

Rails schaalt toch niet?

11000 requests / seconde!

Niet out-of-the box 11000 request / seconde, maar wel met enige aanpassingen!

Iets voor Wisdom?( ik denk het wel )

Rails sweetspots (volgens de heren @ThoughtWorks …)

• Web 2.0 applications that make use of REST and/or AJAX designs

• Small to medium web-based applications with aggressive time-to-market goals

• Low-cost internal prototypes and pilot applications• So-called "soft layer" APIs on hardened transactional systems

Vragen?