Rails 5 – Amsterdam.rb – Uberous

amsterdam.rb
Rails 5
What's new?
Rails 5 by Jeroen Visser 1

amsterdam.rb
I'm Jeroen Visser
• CTO @ Uberous
• github.com/jeroenvisser101
• twiFer.com/jeroenvisser101
• I blog at jrnv.nl
2
That's me
Photo by Tim Gouw

amsterdam.rb
I like beta soHware
3

amsterdam.rb
Current state
5
Race condiJon →

amsterdam.rb
New home page
hFps://github.com/rails/rails/pull/23237
by @gsamokovarov
9

amsterdam.rb
What is AcJon Cable?
13

amsterdam.rb
How does it work?
15

amsterdam.rb
How does it work?
Channel
Imagine this as an IRC channel
Users can subscribe to it
16
Broadcast
Imagine this as a message sent
on a channel

amsterdam.rb 17
class NotificationChannel < ApplicationCable::Channel 
 
 
 
end
def subscribed 
stream_from "some_channel" 
end
def unsubscribed 
# Any cleanup needed when channel is unsubscribed 
end

amsterdam.rb 18
ActionCable.server.broadcast( 
"some_channel", 
some_data: "some string" 
)

amsterdam.rb 19
def subscribed 
stream_for current_user 
end

amsterdam.rb
NotificationChannel.broadcast_to( 
@user, 
@notification 
)

amsterdam.rb
MulJplexing
21
image from wikimedia

amsterdam.rb
Front-end setup
22

amsterdam.rb 23
# app/assets/javascripts/cable.coffee 
 
#= require_self 
 
@App ||= {} 
App.cable = ActionCable.createConsumer()
#= require action_cable
#= require_tree ./channels

amsterdam.rb 24
# .../javascripts/channels/notification_channel.coffee
App.cable.subscriptions.create { 
channel: 'some_channel' 
any_other_parameters: 'some value' 
}, received: (data) -> 
console.log data

amsterdam.rb
ActionController::Renderer
25

amsterdam.rb 26
MessagesController.render( 
partial: 'messages/message', 
locals: { message: params[:message][:body] } 
)

amsterdam.rb 28
rails new my-api-project --api

amsterdam.rb 30
# app/models/product.rb 
class Product < ApplicationRecord 
attribute :price_in_cents, MoneyType.new 
end

amsterdam.rb 31
class MoneyType < ActiveRecord::Type::Integer 
def type_cast(value) 
# convert values like '$10.00' to 1000 
end 
end

amsterdam.rb 32
product = Product.new(price_in_cents: '$10.00') 
product.price_in_cents #=> 1000

amsterdam.rb
ApplicaJonRecord
33

amsterdam.rb 34
class ApplicationRecord < ActiveRecord::Base 
 
end
self.abstract_class = true

amsterdam.rb
ActiveRecord::Relation#or
35

amsterdam.rb 36
Project.flagged.or(Project.open) 
# or 
Project.where(name: "My Project"). 
or(Project.where(name: "Other Project"))

amsterdam.rb
ActiveRecord::Relation#in_batches
37

amsterdam.rb 38
Person.where("age >= 18").in_batches(of: 10) do |people| 
people.update_all(can_drink: true) 
end

amsterdam.rb
ActiveRecord::Base#has_secure_token
39

amsterdam.rb 40
class User < ApplicationRecord 
has_secure_token :email_verification_token 
end

amsterdam.rb 41
user = User.create 
user.email_verification_token
#=> 'e2426a93718d1817a43abbaa'

amsterdam.rb 42
user.regenerate_email_verification_token

amsterdam.rb
rake db:migrate
43

amsterdam.rb
rails db:migrate
44
rake db:migrate

amsterdam.rb
Turbolinks 5
46
Turbolinks 3

amsterdam.rb
Upgrading to Rails 5
47

amsterdam.rb
Write good tests
50
Write tests

amsterdam.rb
rails app:update
51

amsterdam.rb
Thanks!
uberous.io / jrnv.nl
52

Rails 5 – Amsterdam.rb – Uberous

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