Dive to Ruby on Rails Autoloading @teitei_tk Meguro.rb#20

͓લ͸୭ͳΜͩɻ • @teitei_tkͱ໊৐͍ͬͯ·͢ɻ • ΞΠίϯ͸ӈͰ΍ͬͯ·͢ɻ • झຯ͸ਓੜͱRailsͱ TypeScriptͰ͢ɻ • freeeͱ͍͏ձࣾͰಇ͍͍ͯ· ͢ɻ

ࠓ೔࿩͢͜ͱ

Railsͷautoload_pathsͱ eager_load_pathsͷҧ͍ʹ͍ͭ ͯ

autoload_pathsͱ͸ • ޠฐΛڪΕͣʹ͍͏ͱɺRails্Ͱ module΍ఆ਺Λ͍͍ײ͡ʹࣗಈͰಡ ΈࠐΜͰ͘ΕΔ࢓૊ΈͰ͢ɻ

eg. Ruby on Rails class Hoge < ApplicationRecord end

eg. PureRubyͷ৔߹ require 'application_record' class Hoge < ApplicationRecord end

• Pure RubyͰ͸ application_record.rb ΛrequireʹͯಡΈࠐ Ήඞཁ͕͋Δɻ • RailsͰ͸ಛఆͷσΟϨΫτϦ഑ԼͷϑΝΠϧ͸ࣗલͰಡ Έࠐ·ͣͱ΋͍͍ײ͡ʹࣗಈͰಡΈࠐΜͰ͘ΕΔ࢓૊Έ͕ ͋Δ • ͦΕ͕autoload_pathsͰ͢ɻ

ಛఆͷσΟϨΫτϦ is teitei.tk >> !(master) ~/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading $ bin/rails r 'puts ActiveSupport::Dependencies.autoload_paths' Running via Spring preloader in process 39294 /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/assets /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/channels /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/controllers /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/controllers/concerns /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/helpers /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/jobs /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/mailers /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/models /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/app/models/concerns /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/vendor/bundle/ruby/2.5.0/gems/ activestorage-5.2.1/app/assets /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/vendor/bundle/ruby/2.5.0/gems/ activestorage-5.2.1/app/controllers /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/vendor/bundle/ruby/2.5.0/gems/ activestorage-5.2.1/app/controllers/concerns /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/vendor/bundle/ruby/2.5.0/gems/ activestorage-5.2.1/app/javascript /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/vendor/bundle/ruby/2.5.0/gems/ activestorage-5.2.1/app/jobs /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/vendor/bundle/ruby/2.5.0/gems/ activestorage-5.2.1/app/models /Users/teitei.tk/.golang/src/github.com/teitei-tk/dive-to-rails-autoloading/test/mailers/previews

• puts ActiveSupport::Dependencies.autoload_paths Ͱ࣮ ࡍʹautoload_paths͕దԠ͞ΕΔ஋ΛݟΔ͜ͱ͕Ͱ͖· ͢ɻ • config/application.rbʹͯconfig.autoload_pathsʹͯ௥Ճ Λ͢Δͱɺ൓ө͞Ε·͢ɻ

• ৄ͘͠͸ https://railsguides.jp/ autoloading_and_reloading_constants.html#autoload- paths

Rails5͔Βͷڍಈͷมߋ • Rails5͔Βautoload_pathsʹ௥Ճͨ͠ϑΝΠϧ͸ RAILS_ENV=production Ͱ͸ಡΈࠐ·ͳ͍Α͏ʹͳͬͯ ·͢ɻ • https://edgeguides.rubyonrails.org/ upgrading_ruby_on_rails.html#autoloading-is-disabled- after-booting-in-the-production-environment • ୅ΘΓʹ࢖͓͏ͱݴΘΕ͍ͯΔͷ͕eager_load_pathsͰ ͢ɻ

eager_load_pathsͱ͸ • config.eager_load_pathsʹ௥Ճ͞Ε͍ͯΔσΟϨΫτϦͷ ϑΝΠϧΛࣄલʹҰׅͰಡΈࠐΉ࢓૊ΈͰ͢ɻ

Rails::Engine.eager_load! # Eager load the application by loading all ruby # files inside eager_load paths. def eager_load! config.eager_load_paths.each do |load_path| matcher = /\A#{Regexp.escape(load_path.to_s)}\/(.*)\.rb\Z/ Dir.glob("#{load_path}/**/*.rb").sort.each do |file| require_dependency file.sub(matcher, '\1') end end end

• config/environment.rbʹͯRails.application.initialize!Λಡ ΜͰ͍Δͱࢥ͍·͢ɻ͔ͦ͜ΒॳظԽͷྲྀΕΛಡΈऔΔ͜ ͱ͕Ͱ͖·͢ɻ • Rails::Application.initialize!-> Rails::Initializable.run_initializers -> Rails::Application.initializers -> Rails::Application::Finisher.initializers_for ->
 Rails::Engine.eager_load!

᷿ͰΑ͘ݴΘΕΔࣄ • Rails5Ͱ͸autoload_pathsͰ͸ͳ͘ɺeager_load_pathsʹ ม͑Ε͹ok

ͳ͔ͥ • ౴͑͸Rails::Engine.initializer set_load_path ʹ͋Γ·͢ɻ # Add configured load paths to Ruby's load path, and remove duplicate entries. initializer :set_load_path, before: :bootstrap_hook do _all_load_paths.reverse_each do |path| $LOAD_PATH.unshift(path) if File.directory?(path) end $LOAD_PATH.uniq! end

• Rails::Initializable Moduleʹఆٛ͞Ε͍ͯΔ $LOAD_PATHSʹunshiftͰ௥Ճ͍ͯ͠·͢ɻ

_all_load_pathsͱ͸ • Rails::Initializable Moduleʹఆٛ͞Ε͍ͯΔ $LOAD_PATHSʹunshiftͰ௥Ճ͍ͯ͠·͢ɻ • _all_load_pathsͷ࣮ଶ͸config.autoload_paths + config.eager_load_paths + config.autoload_once_pathsΛ ߹Θͤͨ෺Ͱͨ͠ɻ

• RAILS_ENV=production Ͱ͸ eager_load_pathsͷ࢓૊Έ Λར༻͠ɺRAILS_ENV != production Ҏ֎Ͱ͸ autoload_pathsͷ࢓૊ΈΛར༻͍ͯ͠Δɻ

• ৄ͘͠͸Blogʹ·ͱΊ·ͨ͠ɻ • https://note.mu/teitei_tk/n/ne5ae711719b1

ॴײ

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