RubyEnRails2007 - Dr Nic Williams - Keynote

Dr Nic
drnicwilliams.com
Remember:
drnicacademy.com
* setup for demo of
magic_model_generator (pp 36)
* set font size of database.yml to large

What’s cool
about Rails?

Magic
Multi-Connections
As seen on
DHH’s
blog

NewGem
Generator

$ newgem <gem>

NewGem
Generator
As seen in

$ newgem <gem>

Magic Model
Generator
As seen in

??

Dr Nic’s
Academy
“Beginning Ruby on Rails”
July 7/8 - Netherlands

Why is important?
When do I use ?

Why is important?
When do I use ?
Merb Camping CGI Mongrel Handlers

RailsConf
Bet ween last year
and this year, I’ve
realised they aren’t
“Railsconfs”, but...

RubyConf
About web development and other things

Websites are text
And it doesn’t
matter how
the text gets to
the browser

<html>
<head>
<title>Hello world</title>
</head>
<body> Here’s some
<p>Hello World</p> might send
text that you

</body>
</html>

Rails
When you come to I just want to talk
Rails you quickly about these 3...
learn there are
many things you
need to get good at
quickly...

Javascript HTML CSS

Rails
Gems Ruby
When you come to I just want to talk
Rails you quickly about these 3...
learn there are
many things you
need to get good at
quickly...

Rake Databases Unix

RailsConf 2006
To understand
Rails and where
its going, let’s
look at rails 1.0

RailsConf 2006
To understand
Rails and where
its going, let’s
look at rails 1.0

“Can we make $$$ from Rails?”

RailsConf 2007

“Yes.”

RailsConf 2007

“Because its just
text generation” Ok, now let’s
look at the
latest ways to
generate text
on the web...

“Does it scale?”

Everyone worries about
requests per second; but I
think its more important
to worry about the cost
per new feature. Rails is
structured to make it
easy to design and
implement new stuff.

“Does it scale?”

“Yes. Just add more controllers.”
Everyone worries about
requests per second; but I
think its more important
to worry about the cost
per new feature. Rails is
structured to make it
easy to design and
implement new stuff.

RESTful controllers
class PeopleController < ApplicationController
# GET all or search
def index...
def show...
def new...
def edit...
def create...
def update...
def destroy...
end

RESTful controllers
# GET all or search
def index...
def show...
def new...
CRUD operations
def edit...
def create...
def update...
def destroy...
end

RESTful routes

/people/show/1 => /people/1

/people/some_action/45 => /people/45/some_action

Its now cool to use
restful routing. The
beneﬁt is you can
remove the tail of a
url, and the url is still
meaningful.

One of the main
agreements about
convention in Rails

RESTful result types
is RESTfulness.
Same actions, but
new paradigm.


def create
@person = Person.create(params[:person])
respond_to do |format|
format.html { redirect_to person_url(@person) }
format.xml { render :status => :created,
:location => person_url(@person), ... }
end
From developer side,
end you can return more
end data formats with
the same actions.

Any format you want
respond_to do |format|
format.html { render ... }
format.xml { render ... }
format.csv { render ... }
format.js { render ... }
formal.foobar { render ... }
end

ActiveResource

Applications “talking” with REST

This is cool because...
class Person < ActiveResource::Base
self.site = quot;http://contacts.drnicwilliams.com:3000/quot;
end

Person.find_by_name quot;Dr Nic Williamsquot; Who cares
what REST is?
This syntax is
awesome.

Learn more?

Read the README and CHANGELOG for
ActiveResource

http://dev.rubyonrails.org/browser/trunk/activeresource/README

Jester:
REST for Javascript
Base.model(quot;Personquot;, {
plural: quot;peoplequot;,
prefix: quot;http://drnicwilliams.com:3000quot;})

Person.find(quot;allquot;, { premium: true }, This #ﬁnd call is
asynchronous
{ onSuccess: callback }) and invokes
callback on
complete.

by Eric Mill

“Logical” servers for the connector
1) Jumpstart/PXE Boot
2) Monitoring
3) Auditing
4) Logging
5) Provisioning and configuration management
6) DHCP/LDAP for server identification/authentication and control (at dual for failover)
7) DNS: DNS cache and resolver, and a (private) DNS system (4x + 2; 2+ sites)
8) DNS MySQL (4x + 2, dual masters with slaves per DNS node, innodb tables)
9) SPAM filtering servers (files to NFS store and tracking to postgresql)
10) SPAM database setup (postgresql)
11) SPAM NFS store
12) SMTP proxies and gateways out
13) SMTP proxies and gateways in (delivery to clusters to Maildir over NFS)
14) Mail stores
15) IMAP proxy servers
16) IMAP servers
17) User LDAP servers
18) User long running processes
19) User postgresql DB servers
20) User web servers
21) User application servers
22) User File Storage (NFS)
23) Joyent Organization Provisioning/Customer panel servers (web, app, database)
24) iSCSI storage systems
25) Chat servers
Jason Hoffman, Railsconf 2007
26) Load balancer/proxies/static caches
...

Guess which is “Rails”?

Jason Hoffman, Railsconf 2007

A process of
ongoing improvement

Hosting

Don’t deploy Rails to Amazon’s EC2
Run Ruby scripts on Amazon’s EC2

EC2 have virtual Use EC2 for
storage - if you
other
lose your instance,
processes on
you lose data.
demand.
Backup hourly.

Deployment

Capistrano - by Jamis Buck

+
Deprec - by Mike Bailey deprec =
deployment
recipies

deprec - easy peasy

cap install_rails_stack
cap setup
cap deploy_with_migrations
cap restart_apache
Slap ubuntu
on a machine
and go.

install_rails_stack
task :install_rails_stack do
setup_user_perms
enable_universe
disable_cdrom_install
install_packages_for_rails
install_rubygems
The process of
install_gems deploying rails
install_apache generically is
being solved
end

magic_model_generator

magicmodels.rubyforge.org

For demo:
$ pgstart

magic_model_generator
$ rails magic_show -d postgresql
$ database.yml:
database: activerecord_unittest
$ Kill textmate and reload it fresh from
magic_show folder
$ Have /db and /app/models folders open and empty
$ Pump up font size
$ iTerm open to magic_show folder

Now, demo is ready

$ sudo gem install magic_model_generator
# Show post.rb as example

$ rails magic_show
$ cd magic_show
# point database.yml to legacy database
$ rake db:migrate
# check /db/schema.rb contains all tables
$ ruby script/generate magic_model
# check /app/models contains model files

Instead of plugins,
use gems

“But I don’t know
how?”

hoe - Ryan Davis
seattle.rb - ZenTest/autotest

hoe - Ryan Davis
seattle.rb - ZenTest/autotest
# Rakefile
hoe = Hoe.new(GEM_NAME, VERS) do |p|
p.author = AUTHOR
p.description = DESCRIPTION
p.email = EMAIL
p.summary = SUMMARY
p.url = HOMEPATH
end

Its easier to write a Gem than not to!

History.txt
== 0.2.0 2007-06-03

* Added more foo into foo.rb

== 0.1.0 2007-06-02

* Foo and Bar now in own files
* Using Hoe

History.txt
Manifest.txt

Manifest.txt
README.txt
Rakefile
bin/gemsonrails
lib/gemsonrails.rb
lib/gemsonrails/version.rb
scripts/txt2html
setup.rb
templates/init.rb
ordered list of
templates/tasks_gems_freeze.rake
published ﬁles
templates/tasks_gems_link.rake
templates/tasks_gems_unfreeze.rake
templates/tasks_load_tasks_in_gems.rake
test/test_gemsonrails.rb
test/test_helper.rb
website/index.html
website/index.txt
website/javascripts/rounded_corners_lite.inc.js
website/stylesheets/screen.css
website/template.rhtml

History.txt
Manifest.txt

Manifest.txt
README.txt
Rakefile
bin/gemsonrails
lib/gemsonrails.rb
lib/gemsonrails/version.rb
scripts/txt2html
setup.rb
templates/init.rb
ordered list of
templates/tasks_gems_freeze.rake
published ﬁles
templates/tasks_gems_link.rake
templates/tasks_gems_unfreeze.rake
templates/tasks_load_tasks_in_gems.rake
test/test_gemsonrails.rb
test/test_helper.rb
website/index.html
website/index.txt
website/javascripts/rounded_corners_lite.inc.js
website/stylesheets/screen.css
website/template.rhtml
rake check_manifest

NewGem
Generator
$ newgem <gemname>

newgem.rubyforge.org

Test::Unit
or

RSpec
newgem.rubyforge.org

Learn on !

Dr Nic Academy

drnicacademy.com

What: Beginning Rails
When: July 7 and 8th
Where: Amsterdam +/-
BYO: Laptop
Cost: 975€

drnicacademy.com

What: Beginning Rails
When: July 7 and 8th
Where: Amsterdam +/-
BYO: Laptop
Cost: 975€
600€ - “rubyenrails”
drnicacademy.com

Enjoy En !
drnicwilliams.com
drnicacademy.com
by Dr Nic

RubyEnRails2007 - Dr Nic Williams - Keynote

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