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RESCUE SQUAD RAILS EDITION Ancient City Ruby 2015
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I ❤ 'ancient' city
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ben.lovell.720p.S01_E02.mkv
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london
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england
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london
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not yoga, drunk
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psa: don't stare into the eclipse
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ben lovell ltd ™ © ® giving no fucks since 2014
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❤
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rails sucks
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$ rails new life_is_good
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@benlovell twitter/github/irc
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I really suck!
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Here’s some commits I made just the other day
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! "
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Programming is like skipping merrily between car crashes
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WHY!!!!? !
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Ephemeral Teams
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Make it work Make it right Make it fast
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Make it work Make it right Make it fast
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Is it done yet? Is it done yet? Is it done yet?
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!!!
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Rails Derailed
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three hard problems in computer science
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1. cache invalidation
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2. naming things
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DHH
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Changing requirements
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sorry Your project is not a special ❄
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guess what? software changes
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Quit whining!
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No. 1 best job?
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$ git clone ...
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Huge pile of shit?
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!" GTFO?
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5 Steps
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1 Step
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Perception change it!
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I see dead people
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Being a positive influence
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Opinions as pull requests
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Broken windows
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Always leave the camp cleaner than you found it
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It’s better to seek forgiveness than ask permission
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2 step
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Metrics
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CI
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!
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Effect a consistent style
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Make it approachable
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Rubocop
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2nd most stylish rubyist
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$ gem install rubocop ~/code/frontend % rubocop Inspecting 313 files .....................................................C ...................................................... ...................................................... ...................................................... ...................................................... ........................................... Offenses: app/helpers/profile_helper.rb:2:1: C: Extra empty line detected at body beginning. 313 files inspected, 1 offense detected
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Auto correction?
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~/code/frontend % rubocop -a Inspecting 313 files .....................................................C Offenses: app/helpers/profile_helper.rb:2:1: C: [Corrected] Extra empty line detected at body beginning. 313 files inspected, 1 offense detected, 1 offense corrected
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Sorcery!
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Test Coverage
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$ gem install SimpleCov
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You're sitting on a throne of lies
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Cyclomatic Complexity
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$ gem install metric_fu-Saikuro
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Coverage + Cyclomatic Complexity Inform your tests
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Duplication Duplication Duplication Duplication
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$ gem install flay ~/code/frontend % flay app/**/*.rb -f Total score (lower is better) = 256 1) Similar code found in :call (mass = 148) app/controllers/styleguide_controller.rb:63 app/controllers/styleguide_controller.rb:221 2) Similar code found in :defn (mass = 108) app/helpers/application_helper.rb:2 app/helpers/application_helper.rb:9 app/helpers/application_helper.rb:16 app/helpers/application_helper.rb:23 app/helpers/application_helper.rb:30 app/helpers/application_helper.rb:37
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Not all duplication
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Good DRY Bad DRY
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single unambiguous authoritative representation
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Churn
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$ gem install churn ~/code/blog % churn Files +----------------------------------------------------------+---------------+ | file_path | times_changed | +----------------------------------------------------------+---------------+ | Gemfile | 20 | | app/helpers/application_helper.rb | 14 | | app/models/article.rb | 11 | | spec/models/text_filter_spec.rb | 11 | | spec/controllers/articles_controller_spec.rb | 11 | | spec/controllers/setup_controller_spec.rb | 11 | | spec/rails_helper.rb | 10 | | app/models/blog.rb | 10 | | spec/models/article_spec.rb | 10 | | spec/controllers/admin/content_controller_spec.rb | 10 | | spec/helpers/application_helper_spec.rb | 10 | +----------------------------------------------------------+---------------+
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All the metrics! $ gem install metric_fu cane, churn, flog, flay, reek roodi, saikuro, code statistics rails best practices
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code climate?
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Metric Overflow!
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Only capture that you plan to action
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Make it known
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Dashboard
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Gamify
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3 step
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Tests
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% tree spec/models spec/models ├── authentication_token_spec.rb ├── challenge_spec.rb ├── entry_spec.rb ├── facebook_token_spec.rb ├── follow_spec.rb ├── followed_list_spec.rb ├── item_spec.rb ├── list_fulfilment_criterion_spec.rb ├── list_spec.rb ├── prize_spec.rb ├── rating_spec.rb └── user_spec.rb 0 directories, 12 files
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require 'test_helper' class UserTest < ActiveSupport::TestCase # test "the truth" do # assert true # end end
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All kinds of bad
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No tests Slow tests Low quality tests
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Tests are not sacred artifacts
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Tests can be transient
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zero coverage? this might not be so bad
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Feature specs go full stack or go home
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Poor or slow units? wrong time, wrong place
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Repeat after me: Tests are not sacred artifacts
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kill them with fire
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4 step
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Seek and destroy
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Reduce the surface area
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Always be merciless
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Metrics
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Low hanging fruit Targets or goals which are easily achievable but do not require lots of effort
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Improve Incrementally
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versioning rails stay on target, stay on target
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5 step
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Keep it full unicorn
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Fail the build
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Always be improving
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Perception Metrics Tests Reduce & Improve Stay Full Unicorn
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meet hot single sharks in your area
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Thanks! @benlovell
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