Ruby on (Guard)Rails - Speaker Deck

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! Ruby on " Guard(Rails) Mike McQuaid (@MikeMcQuaid)

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me #

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Project Leader of Homebrew (Homebrew Maintainer 2009 – Present)

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Engineer at AllTrails (2012 – 2013)

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Principal Engineer at GitHub (GitHub 2013 – 2023)

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CTO/Cofounder at Workbrew (2023 - Present)

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workbrew.com

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background ⏮

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you? %

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why? &

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! Ruby is great ' for moving fast ( (and breaking things)

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) Go compiler * Rust compiler + Ruby interpreter

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what? ,

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the solutions to these problems is …

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the solutions to these problems is entirely dependent on what you’re optimising for

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What is Mike optimising for?

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1. - developer happiness 2. .customer/user happiness 3. / velocity/quality balance 4. 0 robot pedantry, human empathy

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how? 1

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developer happiness

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developer happiness == ! Ruby

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customer/user happiness

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customer/user happiness == software that works

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customer/user happiness == bugs caught in test

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customer/user happiness == low MTTR

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customer/user happiness == bugs fixed quickly

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velocity/quality balance

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velocity/quality balance == ship fast with few bugs

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velocity/quality balance != ship fast with no bugs

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velocity/quality balance != ship slow with no bugs

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velocity/quality balance != ship fastest, many bugs

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robot pendantry, human empathy

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0 Robot Pedantry, 2 Human Empathy https://mmq.lol/robot https://mikemcquaid.com/robot-pedantry-human-empathy/

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robot pendantry, human empathy == automate (almost) everything

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be specific? 3

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linters 4

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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

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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

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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"

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# 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

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tests :

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1. : rspec 2. ; simplecov 3. < playwright 4. = vcr 5. > parallel_tests 6. ? CodeCov 7. 0 GitHub Actions

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https://justin.searls.co/posts/running-rails-system-tests-with-playwright-instead-of-selenium/

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$ 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

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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

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monitoring @

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1. A sentry 2. B logtail 3. C Better Stack

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group :production do gem "sentry-rails" gem "logtail-rails" end

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types D

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D sorbet

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# 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

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gem "sorbet-runtime" group :development do gem "rubocop-sorbet" gem "sorbet" gem "tapioca" end group :test do gem "rspec-sorbet" end