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Poderosas Interfaces Rails Caike Souza RubyConf BR 2012

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@caike

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Problemas http://www.flickr.com/photos/lianneviau/499003712/sizes/l/in/photostream/

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end Client

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end Client Interface

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Interface

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end Client

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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Protocolo

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment,success: 'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment,success: 'You are now subscribed!') else render :index end end end Baixa Granularidade

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Granularidade

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment,success: 'You are now subscribed!') else render :index end end end

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Callbacks & Observers if pra if ca if ralho e outras bizarrices

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As Três Leis das Interfaces

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Os Três Filtros de Interfaces

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fazer aquilo que seus métodos indicam fazer. #1

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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Payment#save vs. Payment#place

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.place redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class Payment < ActiveRecord::Base protected :save ## # Add your comments here. # Really. ## def place end end

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deve ser eficiente. #2

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Usuários Registrados

    <% User.recent.paginate(@page).each do |user| %>
  • <%= link_to(user.full_name, user) %>
    • <% end %>

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Registered Users

    <% User.recent.paginate(@page).each do |user| %>
  • <%= link_to(user.full_name, user) %>
    • <% end %>

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Registered Users

    <% @users.each do |user| %>
  • <%= link_to(user.full_name, user) %>
    • <% end %>

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Usuários Registrados

    <% @users.each do |user| %>
  • <%= link_to(user.full_name, user) %>
    • <% end %>

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avisar ao client caso haja algum erro. #3

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raise "Invalid HTTP request"

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raise "Invalid HTTP request"

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raise "Invalid HTTP request" vs. raise "Erro na autorização do Cartão de Crédito"

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raise "Erro na autorização do Cartão de Crédito"

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raise "Erro na autorização do Cartão de Crédito"

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fazer aquilo que seus métodos indicam fazer. #1

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deve ser eficiente. #2

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avisar ao client caso haja algum erro. #3

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.save redirect_to(payment,success: 'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.place redirect_to(payment,success: 'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.place redirect_to(payment,success: 'You are now subscribed!') else render :index end end end fazendo muita coisa

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Factory Method

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class PaymentsController < ApplicationController def create payment = Payment.new(params[:payment]) if payment.place redirect_to(payment,success: 'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.build_with(params[:payment]) if payment.place redirect_to(payment,success: 'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.build_with(params[:payment]) if payment.place redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.build_with(params[:payment]) if payment.place redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.build_with(params[:payment]) if payment.place redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PlanSubscriber def self.build_for(user) end def subscribe(payment_info) end end

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class PlanSubscriber def self.build_for(user) end def subscribe(payment_info) end end

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require 'plan_subscriber' describe PlanSubscriber do end

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class PaymentsController < ApplicationController def create payment = Payment.build_with(params[:payment]) if payment.place redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create payment = Payment.build_with(params[:payment]) if payment.place redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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class PaymentsController < ApplicationController def create plan_subscriber = PlanSubscriber.build_for(current_user) if plan_subscriber.subscribe(params[:payment]) payment = plan_subscriber.payment redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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Models != AR::Base

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Rails não é o seu domain http://blog.firsthand.ca/2011/10/rails-is-not-your- application.html

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Design by Contract

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Pre-Conditions Post-Conditions Invariants

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Pre-Conditions

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E-mail deve ser válido. Produto deve estar disponível.

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Pre-Conditions Post-Conditions

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Assento deve estar reservado. Novo pagamento deve ser criado.

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class PaymentsController < ApplicationController def create plan_subscriber = PlanSubscriber.build_for(current_user) if plan_subscriber.subscribe(params[:payment]) payment = plan_subscriber.payment redirect_to(payment, success:'You are now subscribed!') else render :index end end end

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Pre-Conditions Post-Conditions Invariants

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Usuário deve estar ativado. Loja deve estar aberta.

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Pre-Conditions Post-Conditions Invariants

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Pirâmide de complexidade de models

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0 1 2 Pirâmide de complexidade de models

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0 Rails out-of-the-box 1 2 Pirâmide de complexidade de models

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0 Rails out-of-the-box 1 Não utilizar métodos AR::Base nos controllers 2 Pirâmide de complexidade de models

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0 2 Rails out-of-the-box Não utilizar classes AR::Base nos controllers 1 Não utilizar métodos AR::Base nos controllers Pirâmide de complexidade de models

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"Bons sistemas orientados a objeto focam em como as suas diferentes partes se comunicam, e não nas propriedades internas e comportamento dessas partes." Alan Kay

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Mensagens

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Mensagens

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Protocolo

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Os Três Filtros de Interfaces

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Design by Contract

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Obrigado :)

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Poderosas Interfaces Rails Caike Souza RubyConf BR 2012