Rails for PHP Developers

Rails for the PHP Dev
(You know youʼre curious...)

November 7, 2009

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rdempsey

atlanticdominionsolutions

My Pet Peeves

People that drive slow (in general)

My Pet Peeves

People that donʼt use their turn signal

My Pet Peeves

People that read books while they drive

My Pet Peeves

People that canʼt make up their mind

My Pet Peeves

People that post anonymous comments (weak)

My Pet Peeves

Trolls, Internet or otherwise

My Pet Peeves

People that fuck with my sprint

My Pet Peeves

People that fuck with my sprint
Asshole bosses who wonʼt understand their people

Ruby - History

Released in 1995 by Yukihiro “Matz” Matsumoto

Ruby - History

Blends Perl, Smalltalk, Eiffel, Ada, and Lisp

Ruby - History

Natural language syntax

Ruby - History

Natural language syntax
Mass acceptance in 2006

Ruby - Objects

Everything is an object

Ruby - Objects

Everything can be given its own properties (instance
variables) and actions (methods)

Ruby - Objects

All types have methods and instance variables

Ruby - Objects

The same rules apply everywhere

Ruby - Objects

The same rules apply everywhere
Remove, redefine, and extend at will

Ruby on Rails - History

Released in 2005 by David Heinemeier Hansson


Full-stack framework for developing database-backed web
apps


apps
MVC


apps
MVC
Builds on the power of Ruby


apps
MVC
Builds on the power of Ruby
Convention over configuration

Ruby on Rails - Common Uses

Dynamic web sites
Data warehousing and data mining
Statistics reporting
Management applications
Collaborative apps
Community sites
E-commerce
...

PHP MVC Frameworks

Cake PHP
SolarPHP
Symfony
(others)

Arrays - PHP

in_array($needle, $haystack);

Arrays - PHP

in_array($needle, $haystack);

array_push($haystack, $needle);

Arrays - Ruby

1
2
3
4

Variable Assignment - PHP

$a = array();


$a = array();

$b = $a;


$a = array();

$b = $a;

$a[ʻfooʼ] = ʻbarʼ;


$a = array();

$b = $a;


var_export($a); => array(ʻfooʼ => ʻbarʼ)


$a = array();

$b = $a;


var_export($a); => array(ʻfooʼ => ʻbarʼ)

var_export($b); => array()

Variable Assignment - Ruby

a = {} => {}


a = {} => {}

b=a => {}


a = {} => {}

b=a => {}

a[ʻfooʼ] = ʻbarʻ => “bar”


a = {} => {}

b=a => {}


a => {“foo” => “bar”}


a = {} => {}

b=a => {}


a => {“foo” => “bar”}

b => {“foo” => “bar”}

Variable Assignment (2) - Ruby


a = ʻfooʻ => “foo”



b=a => “foo”



b=a => “foo”

a.reverse! => “oof”



b=a => “foo”


b.reverse! => “foo”



b=a => “foo”


b.reverse! => “foo”

a.equal? b => true

http://www.ﬂickr.com/photos/ﬂoridapfe/

Methods - PHP

class Monkey

public function toss($fruit) {

// toss a piece of fruit at someone

}

}

Methods - Ruby

class Monkey

def toss(fruit)

# toss some fruit at someone

end

end

Methods (2) - PHP

class Monkey

public function toss($fruit, $feces = true) {

// toss a piece of fruit at someone

}

}

Methods (2) - Ruby

class Monkey

def toss(fruit, feces = true)

# toss some fruit at someone

end

end

Passing Named Params - PHP

class Building {

public function __construct($height = 10, $width = 10,

$depth = 10)

{

// check and store params

}

}

Passing Named Params (2) - PHP

$b = new Building(10,20,30);

Passing Named Params (3) - PHP

$b = new Building(array(ʻheightʼ => 10,

ʻwidthʼ => 20,

ʻdepthʼ => 50));

Passing Named Params - Ruby

$b = Building.new(:height => 10,

:width => 20,

:depth => 50)

Example PHP Function

for ($bananas = 50, $bananas > 0; $bananas --) {

echo “The monkey has thrown $bananas bananasn”;

}

Example Ruby Block

50.downto(1) { | num | puts “#{num} bananas thrown” }

Example Ruby Block - Hidden Goodies

int.downto(limit) { |i| block } => int

Iterates block, passing decreasing values from int down to
and including limit.

Example Ruby Block

50.downto(1) { |num| puts “#{num} bananas thrown” }

Example Ruby Block - Result

50 bananas thrown

49 bananas thrown

48 bananas thrown

47 bananas thrown

46 bananas thrown

...

1 bananas thrown

Attributes - PHP

class Monkey {
protected $species;
public $name;
public function __construct($species, $name) {
$this -> species = $species;
$this -> name = $name;
}
}

Attributes - Ruby

class Monkey
def initialize(species, name)
@species = species
@name = name
end

def species
@species
end
...
end

Attributes - Ruby

class Monkey
attr_reader :species
attr_accessor :name
attr_writer :bananas_eaten

def initialize(species, name)
...
end

Method Visibility - PHP

public function ...
protected function ...
protected function ...
private function ...
public function ...

Method Visibility - Ruby

class SomeClass

def my_public_method
end

protected

# Everything down here is protected

Method Visibility - Ruby

class Monkey

private

def format(value)
value.capitalize
end

Typing- Ruby

foo = ʻbarʻ => “bar”

Typing- Ruby


foo = 42 => 42

Typing- Ruby


foo = 42 => 42

foo + 2 => 44

Typing- Ruby


foo = 42 => 42

foo + 2 => 44

foo + “2”.to_i => 44

Rails Application Structure

README
Rakefile
app
config
db
doc
lib
log
public
script
test
tmp
vendor

Rails Application Structure - app

app
- controllers
- helpers
- models
- views

Rails Application Structure - conﬁg

config
- boot.rb
- database.yml
- environment.rb
- environments
- initializers
- locales
- routes.rb

Rails Application Structure - db

db
- migrations
- schema.rb

Rails Application Structure - The Rest

doc
lib
log
public
script
test
tmp
vendor

Start a Rails App

rails -d mysql railsforphpdevs

Start a Rails App

rails -d postgres railsforphpdevs

Start a Rails App

rails -d sqlite railsforphpdevs

Rails for PHP Developers

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Editor's Notes