Ruby on (Guard)Rails

The guardrails I love in the Ruby ecosystem and why you should use and love them too.

Presented at [Haggis Ruby](https://haggisruby.co.uk) in 2024.

Transcript

1. ! Ruby on " Guard(Rails) Mike McQuaid (@MikeMcQuaid)
2. me #
3. Project Leader of Homebrew (Homebrew Maintainer 2009 – Present)
4. Engineer at AllTrails (2012 – 2013)
5. Principal Engineer at GitHub (GitHub 2013 – 2023)
6. CTO/Cofounder at Workbrew (2023 - Present)
8. workbrew.com
9. background ⏮
13. you? %
14. why? &
15. ! Ruby is great ' for moving fast ( (and breaking things)
17. ) Go compiler * Rust compiler + Ruby interpreter
18. what? ,
19. the solutions to these problems is …
20. the solutions to these problems is entirely dependent on what you’re optimising for
21. What is Mike optimising for?
22. 1. - developer happiness 2. .customer/user happiness 3. / velocity/quality balance 4. 0 robot pedantry, human empathy
23. how? 1
24. developer happiness
25. developer happiness == ! Ruby
26. customer/user happiness
27. customer/user happiness == software that works
28. customer/user happiness == bugs caught in test
29. customer/user happiness == low MTTR
30. customer/user happiness == bugs fixed quickly
31. velocity/quality balance
32. velocity/quality balance == ship fast with few bugs
33. velocity/quality balance != ship fast with no bugs
34. velocity/quality balance != ship slow with no bugs
35. velocity/quality balance != ship fastest, many bugs
36. robot pendantry, human empathy
37. 0 Robot Pedantry, 2 Human Empathy https://mmq.lol/robot https://mikemcquaid.com/robot-pedantry-human-empathy/
38. robot pendantry, human empathy == automate (almost) everything
39. be specific? 3
40. linters 4
41. 1. 4 rubocop 2. 5 erb_lint 3. 6 better_html 4. 7 prosopite 5. 8 licensed 6. 0 actionlint 7. 9 eslint 8. % GIVE ME MOAR LINTERS
42. group :development do gem "better_html" gem "erb_lint" gem "licensed" gem "rubocop-capybara" gem "rubocop-performance" gem "rubocop-rails" gem "rubocop-rspec" gem "rubocop-rspec_rails" end
43. require: - rubocop-performance - rubocop-rails - rubocop-rspec - rubocop-rspec_rails - rubocop-sorbet - rubocop-capybara AllCops: TargetRubyVersion: 3.3 ActiveSupportExtensionsEnabled: true NewCops: enable EnabledByDefault: true Layout: Exclude: - "db/migrate/*.rb"
44. # Bulk create BrewCommandRuns for each Device. # Since there are no callbacks or validations on # BrewCommandRun, we can safely use insert_all! # # rubocop:disable Rails/SkipsModelValidations BrewCommandRun.insert_all!(new_brew_command_runs) # rubocop:enable Rails/SkipsModelValidations
45. tests :
46. 1. : rspec 2. ; simplecov 3. < playwright 4. = vcr 5. > parallel_tests 6. ? CodeCov 7. 0 GitHub Actions
47. https://justin.searls.co/posts/running-rails-system-tests-with-playwright-instead-of-selenium/
51. $ bin/parallel_rspec Using recorded test runtime 10 processes for 80 specs, ~ 8 specs per process ............................................................... ............................................................... ............................................................... ............................................................... ............................................................... ............................................................... ............................................................... ......................................................... Coverage report generated to /Users/mike/Workbrew/console/ coverage. Line Coverage: 100.0% (6371 / 6371) Branch Coverage: 89.6% (1240 / 1384) Took 15 seconds
52. group :test do gem "capybara-playwright-driver" gem "parallel_tests" gem "rspec-github" gem "rspec-rails" gem "rspec-sorbet" gem "simplecov" gem "simplecov-cobertura" gem "vcr" end
53. monitoring @
54. 1. A sentry 2. B logtail 3. C Better Stack
55. group :production do gem "sentry-rails" gem "logtail-rails" end
56. types D
57. D sorbet
58. # typed: strict class TapsController < ApplicationController sig { void } def initialize super @tap_packages = T.let(nil, T.nilable(T::Hash[String, T::Array[String]])) @homebrew_core_count = T.let(nil, T.nilable(Integer)) @homebrew_cask_count = T.let(nil, T.nilable(Integer)) @homebrew_cask_font_count = T.let(nil, T.nilable(Integer)) end ... end
59. gem "sorbet-runtime" group :development do gem "rubocop-sorbet" gem "sorbet" gem "tapioca" end group :test do gem "rspec-sorbet" end
60. easy for you… E
61. Workbrew/console (2023 - Present)
62. Homebrew/brew (2009 – Present)
63. github/github (~2007 – Present)
64. cheating F
65. questions? G mike@mikemcquaid.com @MikeMcQuaid https://mmq.lol/guardrails