Hardcore Extending Rails 3 - From RailsConf '10

Hardcore!Extending Rails 3

Rick Martinez

Tuesday, June 15, 2010

- Dave Thomas


core


"when I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck."

Duck Typing


Rails 2


I started exploringalternatives to Rails


!


HISS!!!jason seifer

YouTube search: rails vs. django


December 23rd, 2008



+ =

RAILS 3


What makes Rails 3 amazing?

(and why did it take so long?)


“THE GREAT DECOUPLING”



Core componentsare easily customizable.


Core componentsare easily replaceable.

OOTuesday, June 15, 2010

LET’S EXPLORESOME RAILS CORE

FOR THE SAKE OF KNOWING!


THE RAILS STACK

Network

Rack

ActionDispatch

ActionController

ActionView ActiveModel

Railties


LET’S DOUSELESS THINGS


Take this code witha grain of salt


Let’s write a useless DSL for our views.

WRITING A TEMPLATE HANDLER






WHAT ACTION VIEW EXPECTS





MAKING THE DSL


my_cool_dsl.rb


my_cool_handler.rb


views/hello/index.cool


http://localhost:3000/hello




Let’s accept uselessconnections.

WRITING A “TELNET SERVER”


A simple way.ACT LIKE A RACK SERVER


TALK LIKE A RACK SERVER

telnet_server.rb


my_cool_handler.rb


my_cool_dsl.rb

z



CONSISTENCY!


hello_controller.rb views/hello/index.cool

via telnet via browser


DRY!


Let’s make this uselessness

configurable.WORKING WITH RAILTIES


WHAT IS A RAILTIE?The interface between the

Rails framework and its components


WHAT CAN YOUR RAILTIE DO?

• Allow you to accept configuration from application.rb

• Set up initializers in your extension’s context

• Tell Rails about generators and rake tasks

• Build engines, plugins, and applications

Engines, plugins, and applicationsare all subclasses of Railtie inRails 3


Organized!


railtie.rb


lib/super_cool/view_dsl.rb


config/application.rb


Results!


Let’s let others be justas useless.

MAKING THIS ADISTRIBUTABLE FRAMEWORK


ANATOMY OF OUR GEM


ANATOMY OF OUR GEM


package it with the usual tools...



FOOD FOR THOUGHT

IRC bot framework

Modular view systemMUD game framework

Modular enterprise app

A pluggable admin panel


RESOURCES

http://github.com/rails/railsbundle open railsbundle open actionpackbundle open ... etc ...http://railsapi.com/


http://github.com/rails/rails

http://github.com/rails/rails

http://railsapi.com/

http://railsapi.com/

RAILS CODE IS GOOD CODE


RAILS CODE IS REUSABLE CODE


And the more use cases you findfor customizing Rails 3 internals,

the better they will be writtenin the future


Be inspired to look whereyou might’ve not looked before

and learn!


Thanks!

twitter @digx+

[email protected]


mailto:[email protected]

mailto:[email protected]

Technology

Hardcore Extending Rails 3 - From RailsConf '10