Off The Tracks - Speaker Deck

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Off The Tracks @apotonick beta

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Los Shotos!

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An Example.

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class User < ActiveRecord::Base # do this... # do that.. after_save :send_sms_notification end

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class UsersController < Controller def create # ... @user.save end

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class SmartMigration < Migration def change # ... user.save end

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rake db:migrate

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class User < ActiveRecord::Base # do this... # do that.. after_save :send_sms_notification end

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I AM A FEATURE! A

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Fear Of The Class

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User User Form Validations Notifications

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class User < ActiveRecord::Base # do this... # do that.. after_save :send_sms_notification end

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class UsersController < Controller def create # ... @user.save notify_for(@user) end explicit*

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class UsersController < Controller def create # ... @user.save notify_for(@user) end class UserSaveService def call user.save notify_for(user) end def notify_for(user)

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class UsersController < Controller def create # ... UserSaveService.new(@user). call end

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Domain Persistance

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Want some drink, Steve? Oh, yes!

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Cowboy Chat Message Conversation Response

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Cowboy Chat Message Conversatio Response ActiveRecord:: Base

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The Workflow. steve = Cowboy.new(name: "Steve") jim = Cowboy.new(name: "Jim") question = jim.say("Want some drink, Steve?") steve.respond("Oh, yes!", question)

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PORO.

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PORO.

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class Cowboy < OpenStruct end

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class Cowboy < OpenStruct end jim = Cowboy.new(name: "Jim") jim.name #=> “Jim”

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Want some drink, Steve?

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question = jim.say("Want some drink, Steve?")

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class Cowboy < OpenStruct end

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class Cowboy < OpenStruct def say(what) msg = Message.new( content: what) chat << msg end end

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Want some drink, Steve? Oh, yes!

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steve.respond("Oh, yes!", question)

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class Cowboy < OpenStruct ... def respond(what, question) msg = Response.new( content: what, to: question) chat << msg end end

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class Message < OpenStruct end class Response < Message end

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Running The Workflow.

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before do chat = [] end

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before do chat = [] jim = Cowboy.new(name: “Jim”, chat: chat) steve = ... end

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before do chat = [] jim = Cowboy.new(name: “Jim”, chat: chat) steve = ... qst = jim.say("Want some drink, Steve?") steve.respond("Oh, yes!", qst) end

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it “is in right order” do chat.to_readable.should == <

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bonfire$ rake Finished tests in 0.535564s, 5.6016 tests/s, 3.7344 assertions/s.

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Domain Persistance A

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datamappify

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fredwu/datamappify

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Thanks! Next?

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class Message include Datamappify::Entity attribute :content, String end

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class MessageRepository include Datamappify::Repository for_entity Message default_provider :ActiveRecord map_attribute :content, 'ActiveRecord::Message#text' end

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message.content #=> “Oh yes!” (from persistance layer)

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Your Message: “

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class Message < ActiveRecord::Base validates :content, presence: true accepts_nested_attributes ... end

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class Message < ActiveRecord::Base validates :content, presence: true accepts_nested_attributes ... end message.update_attributes(params)

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class MessageForm < Reform::Form property :content, on: :message property :author, on: :message validates :message, presence: true end

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msg = Message.find(1) @form = MessageForm.new(message: msg)

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= simple_form_for @form do |f| = f.input :content

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if @form.validate(params[:message])

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if @form.validate(params[:message]) @form.save do |data, nested|

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if @form.validate(params[:message]) @form.save do |data, nested| Message.new(content: data[:content])

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apotonick/reform

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Recent Messages “ “ Steve Jim

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app/views/chat/show.html.haml = render :partial => "sidebar"

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app/views/shared/_sidebar.html.haml .box %h3 Recent Messages = # render list with @chat.messages

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app/views/shared/_sidebar.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box = pie_chart_for(@chat)

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Recent Messages “ “ Steve Jim

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Recent Messages “ “ 81%

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“ “ /home/ Steve Jim Recent Messages “ “ Steve Jim 81% /dashboard/ /chat/show /stats/ /chat/delete

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app/views/shared/_sidebar.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box - if draw_pie_chart? = pie_chart_for(@chat) - else = happiness_chart_for(@chat)

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View Component.

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class ChatsController < ApplicationController def show @chat = Chat.find ... end end

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app/views/chat/show.html.haml = render :partial => "sidebar"

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app/views/chat/show.html.haml = render :partial => "sidebar" app/views/chat/show.html.haml = render_cell :sidebar, :show, @chat

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class SidebarCell < Cell::Rails def show(chat) @chat = chat render end end app/cells/sidebar/show.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box - if draw_pie_chart? = pie_chart_for(@chat) - else = happiness_chart_for(@chat)

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describe SidebarCell render_cell(:sidebar, :show, chat). should ... end

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Recent Messages “ “ Steve Jim Recent Messages “ “ 81%

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Override?

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class Message def to_s msg = self.upper “” end end

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class Message def format self.upper end def to_s “” end end

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class Message def format self.upper end def to_s “” end end class BetterMessage < Message def format self.lower end end

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View Inheritance!

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class MommyController < ApplicationContr.. def show ... render :partial => 'item' end end views/mommy/_item.erb ?

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class MommyController < ApplicationContr.. def show ... render :partial => 'item' end end class ChildController < MommyController def show ... render :partial => 'item' end end views/child/_item.erb ? views/mommy/_item.erb ?

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app/cells/sidebar/show.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box - if draw_pie_chart? = pie_chart_for(@chat) - else = happiness_chart_for(@chat)

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app/cells/sidebar/show.html.haml .box %h3 Recent Messages = # render list with @chat.messages = render :view => lower_box

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app/cells/sidebar/lower_box.html.haml .box = pie_chart_for(@chat)

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class FunnySidebarCell < SidebarCell end app/cells/funny_sidebar/lower_box.html.haml .box = happiness_chart_for(@chat)

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app/views/chat/show.html.haml = render_cell :sidebar, :show, @chat Recent Messages “ “ Steve Jim

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app/views/discuss/show.html.haml = render_cell :funny_sidebar, :show, @chat Recent Messages “ “ Steve Jim 81%

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class FunnySidebarCell < SidebarCell end app/cells/funny_sidebar/lower_box.html.haml .box = happiness_chart_for(@chat)

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apotonick/cells

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class ChatsController < ApplicationController def show chat = Chat.find(params[:id]) @messages = chat.messages end end

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# objectify 1. POST /messages

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# objectify 1. POST /messages class IsDrinkerPolicy def allowed?(current_user) end

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# objectify 1. POST /messages class IsDrinkerPolicy def allowed?(current_user) end class AddMessageService def call(current_user, params) end

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# objectify 1. POST /messages class IsDrinkerPolicy def allowed?(current_user) end class AddMessageService def call(current_user, params) end class MessageResponder def call end

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Route Render Policies Business

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bitlove/objectify

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List messages Message detail Send message API

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{"content": "Want some drink, Steve?"} Render Document. Parse Document.

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as_json(:include => ...) ActiveModel::Serializer params[..] strong_parameters

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Representer.

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GET http://messages/1 {"content": "Want some drink, Steve?", "created_at": "2012-09-28 19:40", }

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module MessageRepresenter include Roar::Representer::JSON property :content property :created_at end

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msg.extend(MessageRepresenter).to_json

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msg.extend(MessageRepresenter).to_json #=> {"content": "Want some drink, Steve?", "created_at": "2012-09-28 19:40" }

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msg = Message.new.extend(MessageRepresenter) msg.from_json('{"content": "Oh yes!"')

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msg = Message.new.extend(MessageRepresenter) msg.from_json('{"content": "Oh yes!"') msg.content #=> "Oh yes!"

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Oh no! Extend!

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module MessageRepresenter include Roar::Representer::JSON property :content property :created_at end msg.extend(MessageRepresenter). to_json class < Roar::Decorator MessageRepresenter.new(msg).

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Model Representer from_json to_json #content #created_at #content= #created_at=

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More?

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module MessageRepresenter include Roar::Representer::JSON property :content property :from, :extend => CowboyRepresenter, :class => Cowboy end

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module ChatRepresenter include Roar::Representer::JSON collection :messages, :extend => MessageRepresenter end

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module MessageRepresenter include Roar::Representer::XML property :content end

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module MessageRepresenter include Roar::Representer::XML property :content end msg.extend(MessageRepresenter).to_xml #=> Yo!

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David! Hypermedia!

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module MessageRepresenter include Roar::Representer::JSON::HAL property :content link :self do message_url(self) end end

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msg.extend(MessageRepresenter).to_json #=> {"content": "Want some drink, Steve?", "_links" : {"self": {"href":"http://messages/1"}} }

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module MessageRepresenter include Roar::Representer::JSON::Collection version “2.0” href { messages_url(self) } items(class: Message) do property :content end link :self do message_url(self) end end

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[msg].extend(MessageRepresenter).to_json #=> {"collection" => { "version": "2.0", "href": "http://messages", "items": [ "data": [ {"name": "content", "value": "Want some drink, Steve?"}] "links" : {"self": {"href":"http://messages/rss"}} }

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msg = Message.new msg.extend(MessageRepresenter). from_json(“{collection: ...”) msg.version #=> 2.0