Who needs Rails in 2018?

English version of my talk at Ruby Meditation #22

Transcript

1. A polyglot's view of Ruby & Rails or "Who needs Rails in 2018" Leonid Shevtsov · Ruby Meditation · May 2018 · Dnipro
2. Hello! My name is Leo and I'm not a fan of Ruby
3. Hello! My name is Leo and I'm not a fan of Ruby → Ten years ago I was enamoured by it
4. Hello! My name is Leo and I'm not a fan of Ruby → Ten years ago I was enamoured by it → Six years ago I hated it
5. Hello! My name is Leo and I'm not a fan of Ruby → Ten years ago I was enamoured by it → Six years ago I hated it → I searched far and wide for a replacement
6. I searched far and wide for a replacement (that is so trendy, right?)
7. I searched far and wide for a replacement (that is so trendy, right?) → Scala
8. I searched far and wide for a replacement (that is so trendy, right?) → Scala → Clojure
9. I searched far and wide for a replacement (that is so trendy, right?) → Scala → Clojure → Elixir
10. I searched far and wide for a replacement (that is so trendy, right?) → Scala → Clojure → Elixir → Golang
11. I searched far and wide for a replacement (that is so trendy, right?) → Scala → Clojure → Elixir → Golang → F#
12. I searched far and wide for a replacement (that is so trendy, right?) → Scala → Clojure → Elixir → Golang → F# → Node.js
13. In general, it's extremely valuable to try out programming languages that are not your "main"
14. But I did come back to Ruby Ruby · Golang · JavaScript
15. But I did come back to Ruby Ruby · Golang · JavaScript
16. Material properties of Ruby
17. Simplicity A minimal set of rules
18. Simplicity 1 # The famous Hello World # Program is trivial in # Ruby. Superfluous: # # * A "main" method # * Newline # * Semicolons # # Here is the Code: puts "Hello World!" 1 https://ruby-lang.org
19. Conventions Human understanding
20. Conventions validates_presence_of :name after_filter :send_email expect(results).to match_array(%w(foo bar))
21. Pleasant, readable code Code for humans, not compilers
22. Pleasant, readable code 2 5.times { print "Odelay!" } exit unless "restaurant".include? "aura" ['toast', 'cheese', 'wine'].each { |food| print food.capitalize } 2 http://poignant.guide/book/chapter-3.html
23. Living in Runtime
24. Living in Runtime class User < ApplicationRecord # поля???? end vs $> rails console > User.methods => [:id, :name, :email, ...]
25. Rapid development Modifications on the fly
26. Rapid development $> heroku run rails console # Copy + Paste > class User def buggy_method # fixed implementation goes here end end > User.where(buggy: true).each(&:buggy_method)
27. Ruby properties → Simplicity → Conventions → Pleasant readable code → Living in runtime → Rapid development
28. Ruby · Golang · JavaScript
29. Simplicity + Conventions + Rapid development = Projects where logic and especially data structures are still unknown
30. Simplicity + Conventions = Integration tests (for projects in other languages)
31. Simplicity + Conventions + Runtime = Systems configuration languages
32. Readable code + Runtime = Scripts
33. Ruby
34. Ruby Clearly defined logic and data
35. Ruby Limited technical budget
36. Ruby Concurrent programming
37. Ruby that I love
38. Ruby that I love is religiously Rubocopped
39. Ruby that I love is religiously Rubocopped Metrics: → line length → method length → module length → complexity → number of arguments
40. Ruby that I love consists of small modules
41. Ruby that I love consists of small modules → but not mixins!
42. Ruby that I love uses dependency injection
43. Ruby that I love uses dependency injection → "Functional with configuration" pattern
44. Ruby that I love does not keep state
45. Ruby that I love does not keep state → especially in Rails
46. Ruby that I love is covered by simple tests
47. Ruby that I love does not obsess over "patterns"
48. Ruby that I love does little metaprogramming
49. Ruby that I love isolates mutations
50. Ruby that I love is well commented
51. Ruby that I love is well commented → monkeypatching → hacks → "...I would typically write XXX, but in this case I will write YYY..." → write that down as a comment!
52. Ruby that I love → Rubocopped religiously → Structured into small modules → Uses dependency injection → Does not keep state → Simple tests (thanks to DI) → Does not use too much "patterns" → Does not use too much metaprogramming → Mutable code is isolated → Decisions are documented
53. Rails that I love
54. Rails that I love Has little code in the models
55. Rails that I love Has little code in the models → validation → life cycle → associations → scopes
56. Rails that I love Has little code in controllers
57. Rails that I love Has little code in controllers → input checking → output generation
58. Rails that I love Has business logic in modules
59. Rails that I love Has business logic in modules → Rails is only for HTTP and the database. → Apps are more complex than that. → Own your app/*!
60. Rails that I love Isolated database access
61. Rails that I love Isolated database access class User < ApplicationRecord has_many :posts has_one :latest_post, class_name: 'Post', -> { order('created_at DESC') } end User.limit(10).includes(:latest_post)
62. Rails that I love Use React as a view
63. Rails that I love Use React as a view (so no ActionView at all) !
64. Rails that I love RSpec tests
65. Rails that I love RSpec tests → simple → especially for business logic
66. Rails that I love Capybara+Chrome
67. Rails that I love Capybara+Chrome → the most "reliable" modern solution → headless mode
68. Rails that I love → Has little code in the models → Has little code in controllers → Isolated database access → Has business logic in modules → Use React as a view → RSpec tests → Capybara+Chrome
69. What would I like to see in Ruby → Auto formatting (a la Prettier) → Static typing (optional)
70. Thanks! Questions? subscribe to my RSS: http://l-s.me send emails: leonid@shevtsov.me