Riding Rails for 10 Years

This talk goes through 10 years of Rails by looking at Shopify and how the project, and Rails, has evolved over that time.

Transcript

1. Riding&Rails&for&10&Years John%Duff
2. Overview • Why%look%at%Shopify? • History%of%Rails%updates • Hardest%things? • Why%upgrade? • Recommenda;ons
3. Why$look$at$Shopify? • Started(around(the(same(/me(as(Rails • Never(rewri6en • Has(used(Rails(pre(1.0(to(4.2 • Git(repository(holds(most(of(this(history
6. ~45!different!versions!of!Rails!in!produc3on
7. Going&back&in&+me
9. Going&back&in&+me • MVC%pa(erns%already%established • Tes5ng%already%baked%in • deploy.rb
10. Going&back&in&+me:&rou+ng ActionController::Routing::Routes.draw do |map| map.index '', :controller => 'shop' # namespaces map.connect 'admin', :controller => 'admin/auth', :action => 'login' map.checkout 'checkout', :controller => 'checkout/standard', :action => 'index' # media files map.connect 'media/:action/:id/:filename', :controller => 'media', :action => 'image' # admin map.connect ':controller/:action/:id', :action => 'index', :id => nil end
11. Going&back&in&+me:&controller class Admin::OrdersController < AdminAreaController def index list render :action => 'list' end def list @pages = Paginator.new(self, shop.orders.count, 20, @params[:page]) @orders = shop.orders.find(:all, :limit => 20, :offset => @pages.current.offset) end def show @order = shop.orders.find(@params[:id], :include => [:line_items, :payments]) end end
12. Going&back&in&+me:&model class Order < ActiveRecord::Base belongs_to :shop has_many :line_items belongs_to :billing_address, :class_name => 'Address' validates_presence_of :email, :shop validates_format_of :email, :with => Format::EMAIL, :message => 'not a valid email' serialize :receipt, Hash attr_accessible :email def deliver_confirmation_email CheckoutMailer.deliver_user_confirmation(self) end end
13. Going&back&in&+me:&javascript module AjaxHelper def appear(id, where = nil) case where when :first "new Effect.Appear($('#{id}').firstChild)" else "new Effect.Appear('#{id}')" end end end
14. Going&back&in&+me:&more • Sweepers • Observers • rhtml/views • Dependencies/in/vendor/or/submodules • FastCGI/to/interface/with/the/webserver
15. -------------------------------------------------- Language files code -------------------------------------------------- Ruby 177 4967 Javascript 10 2436 YAML 33 1465 Ruby HTML 61 1399 CSS 4 638 SQL 2 573 HTML 2 41 Bourne Again Shell 1 2 -------------------------------------------------- SUM: 290 11521 --------------------------------------------------
16. A"lot"has"changed,"but"a"lot"is"s2ll"the"same
17. Rails&1.2
18. Rails&1.2 • REST&and&Resources • Mul2byte&support • Rou2ng&and&auto8loading&rewri;en • Formats&and&respond_to
19. Rails&1.2:&Formats&and&respond_to ActionController::Routing::Routes.draw do |map| map.connect ':controller/:action.:format' map.connect ':controller/:action/:id.:format' end class Admin::OrdersController < AdminAreaController def list @pages = Paginator.new(self, shop.orders.count(:all), 25, params[:page]) @orders = shop.orders.find(:all, :limit => 25, :offset => @pages.current.offset) respond_to do |format| format.html { render :action => 'list' } format.csv { render_export_file('orders.csv', Mime::CSV, CSV.export(@orders)) } end end end
20. Rails&1.2:&REST&and&Resources ActionController::Routing::Routes.draw do |map| map.resources :collects, :path_prefix => "admin", :controller => "admin/collects" end class Admin::CollectsController < AdminAreaController def create @collect = Collect.new(:product => @product, :collection => @collection) @collect.save ? head(:created) : head(:precondition_failed) end def destroy @collect = Collect.find(params[:id]) if @collect and shop.products.exists?(@collect.product_id) @collect.destroy head :ok else head :not_found end end end
21. Rails&1.2:&more • Ini%al(RESTful(urls(looked(like(/orders/1;edit • Changed(in(Rails(1.2.4(to(/orders/1/edit
22. Rails&2.0
23. Rails&2.0 • Added%rescue_from • Fixture%dependencies • Rou5ng%namespaces • Mul5%view%responses • Ac5onWebService%out,%Ac5veResource%in • JSON%serializa5on
24. Rails&2.0:&rescue_from # before def rescue_action(e) case e when MerchantCredentialError when IrreparableGoogleCheckoutError when ActiveRecord::RecordNotFound else end end # after rescue_from MerchantCredentialError do |exception| response.headers["WWW-Authenticate"] = %(Basic realm="Ping Backend") render :status => "401 Unauthorized" end
25. Rails&2.0:&Fixture&dependencies # before bigcheese_blog: id: 1 shop_id: 1 title: Mah Blog updated_at: 2006-02-02 # after bigcheese_blog: shop: snowdevil title: Mah Blog updated_at: 2006-02-02 # Fixtures.identify(:snowdevil) when ambiguous
26. Rails&2.0:&Rou-ng&namespaces # before map.resources :fulfillment_services, :path_prefix => 'admin/preferences', :controller => 'admin/preferences/fulfillment_services' # after admin.namespace :admin do |admin| admin.namespace :preferences do |prefs| prefs.resources :fulfillment_services end end
27. Rails&2.1
28. Rails&2.1:&config.gems # config/environment.rb Rails::Initializer.run do |config| config.gem "right_aws" config.gem "entp-multipass", :source => 'http://gems.github.com' end
29. Rails&2.3
30. Rails&2.3 • Rack • accepts_nested_a-ributes • find_in_batches • improvements7to7Rails7Engines • Rails7metal • Applica<on7templates
31. Rails&2.3:&Rack # config/environment.rb ActionController::Dispatcher.middleware.insert_before 'Rack::Lock', CommonBlacklist # lib/common_blacklist.rb class CommonBlacklist def initialize(app) @app = app end def call(env) if env['REQUEST_URI'] =~ /^\/feedsplitter.php/ [404, {"Content-Type" => "text/plain"}, ['[Filtered]']] else @app.call(env) end end end
32. Rails&2.3:&accepts_nested_a2ributes # before class ApiClient < ActiveRecord::Base attr_accessible :new_link_attributes, :existing_link_attributes def new_link_attributes=(link_attributes) link_attributes.each do |attributes| links.build(attributes) end end # more shenanigans end # after class ApiClient < ActiveRecord::Base attr_accessible :links_attributes accepts_nested_attributes_for :links, :allow_destroy => true end
33. Rails&3
34. Rails&3 • Arel • Bundler • Ac+ve-model-broken-up • js/test/orm-agnos+c
35. Rails&3:&Arel # before class StoredAsset < ActiveRecord::Base def self.with_prefix(prefix) scoped(:conditions => {:prefix => prefix.to_s}) end end # after class StoredAsset < ActiveRecord::Base scope :with_prefix, lambda { |prefix| where(:prefix => prefix.to_s) } end
36. Rails&3:&Bundler # before # config/environment.rb Rails::Initializer.run do |config| config.gem "right_aws" end # after # Gemfile source "http://gems.rubyforge.org" source "http://gems.github.com" gem "rack", '1.0.1' gem "rails", '2.3.5'
37. Rails&3.1&and&3.2
38. Rails&3.1&and&3.2 • Assets&pipeline • JQuery&the&default&JS&library • Lots&of&internal&API&changes • 248&changed&files&with&1,366&addiAons&and&1,656&deleAons
39. Rails&4.0
40. Rails&4.0 • Ruby&2 • Turbolinks • Russian&doll&caching • Strong&parameters • Remove&observers • Remove&hash&and&dynamic&finders
41. Rails&4.0:&dynamic&finders # before shop.customers.find_or_initialize_by_email(data[:email]) PaymentProvider.find_all_by_type(:direct) # after shop.customers.where(data.slice(:email)).first_or_initialize PaymentProvider.where(type: 'direct')
42. Rails&4.1
43. Rails&4.1 • Spring(applica,on(preloader • Variant(templates
44. Rails&4.1:&Variant&templates class ApplicationContoller < ActionController::Base before_action :set_mobile_variant def set_mobile_variant request.variant = :mobile if request.user_agent =~ USER_AGENT_PATTERN end end # views/admin/customers/show.html+mobile.erb
45. That%brings%us%to%today
46. Started'easy,'got'hard
47. Hardest(things? • Marshaling+changes • Maintaining+momentum+with+a+large+team • Large+codebase+with+lots+of+edge+cases • Performance+regressions
48. Why$upgrade? • New%features • Be-er%security • Hiring • Codebase%longevity
49. Recommenda)ons • Avoid'monkey'patching'Rails • Keep'dependencies'low • Ship'small'changes'early'and'o:en • Parallel'CI • Dedicate'a'team • Ship'to'isolated'produc@on'servers
50. john.duff@shopify.com @johnduff