Breaking Bad: What Happens When You Defy Conventions?

With Rails being over ten years old now, we know that the Rails way works well. It's battle tested and successful. But not all problems we try to solve fit into its idea on how our application should be structured. Come along to find out what happens when you don't want to have an app directory anymore. We will see what is needed in order to fight parts of the Rails convention and if it's worth it.

Recording: http://confreaks.tv/videos/railsconf2017-breaking-bad-what-happens-when-you-defy-conventions

Transcript

1. Breaking Bad 
 What Happens When
 You Defy Conventions? Christoph Gockel RailsConf Apr 25 - 27, 2017 Image Originally taken from: https://www.youtube.com/watch?v=TU-PXfzsj4o
4. https://unsplash.com/photos/EOq4Dj33G_U
8. Architecture Breaking of Things Trade-Offs Status Quo
9. https://www.amazon.co.uk/Status-Quo-Very-Early-Years/dp/B0128Y8RKK
10. British Reference
11. Status Quo
13. https://unsplash.com/photos/PNKEmkgdNHo
14. Pareto Principle
15. 80 20
16. 80 20 Users Functionality
17. 80 20 Rails Applications Rails’ Features
18. https://unsplash.com/photos/3qkgF8wQ9EI
19. ~5x minute
20. 0 100 200 300 400 Previous Application Previous Application: • 4800 specs • 377 seconds
22. https://unsplash.com/photos/K3uOmmlQmOo
24. Boot Up
25. 1. Rails Framework 2. Dependencies from Gemfile 3. initialize!
26. Eager Loading
27. # config/application.rb require "rails/all" require "action_controller/railtie" require "sprockets/railtie"
28. Support from rails new
29. ... -M, [--skip-action-mailer], [--no-skip-action-mailer] -O, [--skip-active-record], [--no-skip-active-record] -C, [--skip-action-cable], [--no-skip-action-cable] -S, [--skip-sprockets], [--no-skip-sprockets] [--skip-spring], [--no-skip-spring] [--skip-listen], [--no-skip-listen] -J, [--skip-javascript], [--no-skip-javascript] [--skip-turbolinks], [--no-skip-turbolinks] -T, [--skip-test], [—no-skip-test] ...
30. # config/application.rb require "rails" # Pick the frameworks you want: require "active_model/railtie" require "active_job/railtie" require "active_record/railtie" require "action_controller/railtie" require "action_mailer/railtie" require "action_view/railtie" require "sprockets/railtie" # require "rails/test_unit/railtie"
31. Bundler.require(*Rails.groups)
32. # gems time
33. # config/application.rb config.active_support.bare = true config.cache_classes = true config.enable_dependency_loading = false
34. https://www.pexels.com/photo/white-windmill-under-clear-blue-sky-199480/
35. app bin config db lib public spec vendor Gemfile Gemfile.lock README.md Rakefile config.ru
36. app bin config db lib public spec vendor Gemfile Gemfile.lock README.md Rakefile config.ru assets channels controllers helpers jobs mailers models views
37. lib bin config db lib public spec vendor Gemfile Gemfile.lock README.md movies channels controllers helpers jobs mailers models views edit.html.erb index.html.erb movie.rb movie_repository.rb movies_controller.rb show.html.erb application_controller.rb
38. # config/application.rb config.active_support.bare = true config.cache_classes = true config.enable_dependency_loading = false config.eager_load = false config.autoload_once_paths = [] config.autoload_paths = [] config.eager_load_paths = []
39. ActionController::RoutingError (uninitialized constant Movies::MoviesController): activesupport (4.2.1) lib/active_support/inflector/methods.rb:263:in 'const_get' activesupport (4.2.1) lib/active_support/inflector/methods.rb:263:in 'block in constantize' activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in 'each' activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in 'inject' activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in 'constantize' actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:70:in 'controller_reference' actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:60:in 'controller' actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:39:in 'serve' actionpack (4.2.1) lib/action_dispatch/journey/router.rb:43:in 'block in serve' actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in 'each' actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in 'serve'
40. Lazy Loading
41. ActionController::RoutingError (uninitialized constant Movies::MoviesController): activesupport (4.2.1) lib/active_support/inflector/methods.rb:263:in 'const_get' activesupport (4.2.1) lib/active_support/inflector/methods.rb:263:in 'block in constantize' activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in 'each' activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in 'inject' activesupport (4.2.1) lib/active_support/inflector/methods.rb:259:in 'constantize' actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:70:in 'controller_reference' actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:60:in 'controller' actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:39:in 'serve' actionpack (4.2.1) lib/action_dispatch/journey/router.rb:43:in 'block in serve' actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in 'each' actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in 'serve'
42. # config/routes.rb Rails.application.routes.draw do ... end module ActiveSupport::Dependencies old_constantize = instance_method(:constantize) define_method(:constantize) do |klass| require klass.underscore if klass =~ /Controller/ old_constantize.bind(self).(klass) end end
43. Explicit require
44. require "virtus" require "sequel" require "date" require "set" require "uri" require "socket" require "securerandom" require "bcrypt" require "thread" require "ostruct" require "yaml" require "json" require "bigdecimal" require "active_support/core_ext/object/blank" require "active_support/core_ext/object/duplicable" require "active_support/core_ext/object/deep_dup" require "active_support/core_ext/object/try"
45. Example #1
46. https://unsplash.com/photos/y1IEnAYvMxY
47. 0 100 200 300 400 Previous Application New Way Previous Application: • 4800 specs • 377 seconds New Way: • 5500 specs • 23 seconds Suite Runtime
48. 0 5 10 15 20 Previous Application New Way Previous Application: • 18 seconds New Way: • 2 seconds Time for One Test
49. No ActiveRecord
50. Repositories
51. Example #2
52. 8:30 Suite Runtime 2600 Tests 730 1870 220 Gems ActiveRecord
53. 0 5 10 15 20 require "rails/all" explicit require require “rails/all”: • 14 seconds explicit require: • 9 seconds Controller Spec
54. 0 2 4 6 8 require "rails/all" explicit require require “rails/all”: • 6.5 seconds explicit require: • 0.6 seconds Non-Controller Spec
55. 0 150 300 450 600 Existing Application Projected Optimizations Previous Application: • 2600 specs • 510 seconds Projected Optimizations: • 2600 specs • 5-6 minutes Projections
56. tl;dr
57. https://unsplash.com/photos/n463SoeSiVY
58. spec_helper.rb
59. spec_helper.rb • RSpec • Helpers rails_spec_helper.rb • spec_helper.rb • Rails environment
60. The Rails Way https://unsplash.com/photos/vCqmY3bfqfo
61. Convention 
 over
 Configuration
62. Explicitness over Implicitness
63. A Heuristic,
 Not a Rule
64. Architecture
65. Clean Architecture
66. Hexagonal Architecture
67. Service Layer
69. Source: https://martinfowler.com/eaaCatalog/serviceLayer.html
70. Source: https://martinfowler.com/eaaCatalog/serviceLayer.html
71. Source: https://martinfowler.com/eaaCatalog/serviceLayer.html
72. Rails Is Not Your Application
73. E-Commerce Example
74. User Customer Basket Product Category Invoice DeliveryMethod PaymentMethod
75. Domain-Driven Design Eric Evans
76. Customer Browser CheckoutController Basket Checkout Order Database …
77. MVC?
78. Model Controller
79. Controller Model
80. https://static.pexels.com/photos/8619/sky-red-blue-rubber.jpg
81. Model Controller … … …
83. app bin config db lib public spec vendor Gemfile Gemfile.lock README.md Rakefile config.ru
84. app bin config db lib public spec vendor Gemfile Gemfile.lock README.md Rakefile config.ru
85. Trade-Offs
90. https://unsplash.com/photos/1PHDS-PFtcM
91. https://unsplash.com/photos/_8sXGXFPOes
92. Thank You Christoph Gockel @ChristophGockel https://8thlight.com christoph@8thlight.com
93. Resources Articles Ruby DeRailed: Fast Tests - https://8thlight.com/blog/myles-megyesi/2013/10/10/ruby-derailed-fast-tests.html Ruby DeRailed: Emergent Design - https://8thlight.com/blog/paul-pagel/2013/10/17/ruby-derailed-emergent-design.html The Repository Pattern - https://8thlight.com/blog/mike-ebert/2013/03/23/the-repository-pattern.html Rails is omakase - http://david.heinemeierhansson.com/2012/rails-is-omakase.html Linearity of Bundler and require - https://github.com/rubygems/rubygems/issues/1076 Clean Architecture - https://8thlight.com/blog/uncle-bob/2012/08/13/the-clean-architecture.html Hexagonal Architecture - http://alistair.cockburn.us/Hexagonal+architecture Service Layer - https://martinfowler.com/eaaCatalog/serviceLayer.html Talks RailsConf 2015 - Opening Keynote, David Heinemeier Hansson - https://www.youtube.com/watch?v=KJVTM7mE1Cc Boundaries, Gary Bernhardt - https://www.destroyallsoftware.com/talks/boundaries Ruby Derailed, Myles Megyesi - https://vimeo.com/84696817 Images (if not credited otherwise) https://raumrot.com, https://unsplash.com, https://pexels.com