RIDING RAILS 4

#BCNONRAILS4

PHILIP DE SMEDT

@PHILIPDESMEDT

PHILIPDESMEDT.COM

FULL-STACK DEVELOPER

FREELANCE

(HIRE ME)

I WROTE A BOOKUPGRADE TO RAILS 4

WHO HAS TRIED RAILS

4?gem install rails --version 4.0.0.beta1 --no-ri --no-rdoc

TURBOLINKS

LISTENS TO CLICK EVENTS

LISTENS TO CLICK EVENTS

LOADS CONTENT

WITHOUT RELOADING THE PAGE

LISTENS TO CLICK EVENTSLOADS CONTENT WITHOUT RELOADING THE PAGE

REPLACES BODY+TITLE

USING HTML5 pushState

DEMO

RUSSIAN DOLL CACHING

class Post < ActiveRecord::Base has_many :categoriesend

class Category < ActiveRecord::Base belongs_to :post, touch: trueend

LET’S CACHE

<!-- app/views/posts/show.html.erb --><% cache [‘v1’, @post] do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul><% end %>

RAILS 3

RAILS 3

<!-- app/views/categories/_category.html.erb --><% cache [‘v1’, category] do %> <li> <%= category.title %> <%= link_to “edit”, category %> </li><% end %>

views/v1/posts/1-20130228151844

RAILS 3 CACHE KEYS

RAILS 3

<!-- app/views/categories/_category.html.erb -->

<% cache [‘v2’, category] do %> <li> <%= category.title %>

<%= link_to “RENAME”, category %> </li><% end %>

<!-- app/views/posts/show.html.erb -->

<% cache [‘v2’, @post] do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul><% end %>

RAILS 3

<!-- app/views/categories/_category.html.erb --><% cache category do %> <li> <%= category.title %> <%= link_to “edit”, category %> </li><% end %>

<!-- app/views/posts/show.html.erb --><% cache @post do %> <h1><%= @post.title %> categories:</h1> <ul><%= render @post.categories %></ul><% end %>

views/posts/1-20130228151844/fbda9857614e68ed1df453559a761d47

RAILS 4 CACHE DIGEST

STRONG PARAMETERS

class User < ActiveRecord::Base attr_accessible :name, :emailend def create

@user = User.new(params[:user])@user.save

end

RAILS 3

EXAMPLE

class CarsController < ApplicationControllerdef create

@car = Car.new(car_params) if @car.save

redirect_to @car else render ‘new’

end endend

RAILS 4

private def car_params params.require(:car).permit(:name, :year, :brand) end

require(key) - Ensures that a parameter is present. If it’s present,

returns the parameter at the given key, otherwise raises an

ActionController:: ParameterMissing error.

permit(filters) - Returns a new ActionController::Parameters

instance that includes only the given filters

and sets the permitted attribute for the object to true. This is useful

for limiting which attributes should be allowed for mass updating.

LIVE STREAMING

ACTIONCONTROLLER::LIVE

MIXIN I/O OBJECTSTREAM DATA TO CLIENT

DON’T USE WEBrick

USE PUMA OR RAINBOWS!

RUNS IN SEPARATE THREAD

CLOSE YOUR STREAM

WHEN DONE

PUMA vs. RAINBOWS! vs. NODE.JS

RUBYSNIPPETS.COM

DEMO

ACTIVEMODEL::MODEL

FORM WITHOUT ACTIVE

RECORD. WTF?

FORM_TAG HELPER

CREATE MODEL

EXAMPLE

class Contactinclude ActiveModel::Model

attr_accessor :name, :email, :messagevalidates :name, presence: truevalidates :email, presence: truevalidates :message, presence: true,

length: { maximum: 300 }end

contact = Contact.new(name: 'John Doe', email: 'john@doe.com', message: 'a test')

<h1>Contact Us</h1>

<%= form_for @contact do |f| %><%= f.label :name %><%= f.text_field :name %><%= f.label :email %><%= f.email_field :email %><%= f.label :message %><%= f.text_area :message %><%= f.submit 'Submit' %>

<% end %>

class ContactsController < ApplicationController

def new

@contact = Contact.new

end

def create

@contact = Contact.new(params[:contact])

if @contact.valid?

UserMailer.new_contact(@contact).deliver

redirect_to root_path, notice: "Message sent! Thanks.”

else

render :new

end

end

end

LOTS OF OTHER STUFF

CONTROLLER-WIDE E-TAGS

THREAD SAFETY

ENCRYPTED COOKIES

ROUTING CONCERNS

HTTP PATCH VERB

CUSTOM FLASH TYPESHTML5 FORM HELPERS

SCHEMA CACHE DUMP

NO MORE OBSERVERS/SWEEPERS

INDEX PAGE CONTROLLERACTIVE RESOURCE

PAGE/ACTION CACHING

EDUCATION IS BROKEN.I’LL BE TEACHING RAILS…

I <3 DEVBOOTCAMP/STARTER LEAGUE/…

IN BARCELONA.

PHILIP DE SMEDT

@PHILIPDESMEDT

PHILIPDESMEDT.COM

COME SAY HI

LEANPUB.COM/UPGRADETORAILS4