Introduce-my-gem-factory_strategist

by Keiko Kaneko

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Keiko Kaneko ( @neko314 ) 2021.10.22 (Fri) Kaigi on Rails 2021 Day1 FactoryBot ͷ build strategy Λ ͍͍ײ͡௚ͯ͘͠ΕΔ gem Λ ࡞ͬͨ࿩

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• ͔Ͷ͜ɹ͚͍͜ • GitHub: neko314 / Twitter: neko314_ • Asakusa.rb • גࣜձࣾΞϯυύου • ܹਏ͸ϥΠϑϫʔΫ • ۦ͚ग़͠؍Δক ࣗݾ঺հ

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• gem ͷ঺հ • ಈػ • ࣮૷ • ੒Ռ • ͜Ε͔Β ΞδΣϯμ

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ͦͷલʹగਖ਼ 🙏

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FactoryBot ͷ build strategy Λ͍͍ײ ͡௚ͯ͘͠ΕΔ gem Λ࡞ͬͨ࿩ ↓ FactoryBot ͷ build strategy Λ͍͍ײ ͡ʹڭ͑ͯ͘ΕΔ gem Λ࡞͍ͬͯΔ࿩

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վΊͯ…

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🤖 FactoryStrategist ͷ͝঺հ🕵 https://github.com/neko314/factory_strategist

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FactoryStrategist ͱ͸ FactoryBot ͷ build strategy Λ ͍͍ײ͡ʹڭ͑ͯ͘ΕΔ gem

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σϞ $ FATORYSTRATEGIST=1 bin/rspec spec/models/user_spec.rb

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σϞ $ FATORYSTRATEGIST=1 bin/rspec spec/models/user_spec.rb

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σϞ $ FATORYSTRATEGIST=1 bin/rspec spec/models/user_spec.rb "./spec/models/user_spec.rb:4 create can be replaced to build" . Finished in 0.03062 seconds ( fi les took 5.47 seconds to load)1 example, 0 failures

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ಈػͷ࿩

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• ςετΛ଎͍ͨ͘͠ • Ͱ͖Δָ͚ͩʹίʔυΛॻ͖͍ͨ • ςετͰ͸ʮԿΛςετ͢Δ͔ʯʹ஫ྗͯ͠ ʮͲ͏ॻ͔͘ʯʹΤωϧΪʔΛ஫͕ͳͯ͘΋ྑ ͍ͨ͘͠ ಈػ

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• ࡢ೥ͷ Kaigi on Rails ͷ toshimaru ͞Μͷ͓࿩ • https://speakerdeck.com/toshimaru/ factorybot-the-right-way ಈػ - ςετΛ଎͍ͨ͘͠

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• "build strategies"ͱ͸ • https://github.com/thoughtbot/factory_bot/ blob/master/README.md • https://github.com/thoughtbot/factory_bot/ blob/master/GETTING_STARTED.md ಈػ - ςετΛ଎͍ͨ͘͠

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• "build strategies"ͱ͸ ಈػ - ςετΛ଎͍ͨ͘͠

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• build strategies • create • build • build_stubbed • attributes_for ಈػ - ςετΛ଎͍ͨ͘͠

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• build strategies • create • build • build_stubbed • attributes_for ಈػ - ςετΛ଎͍ͨ͘͠ ͜ΕΒΛ࢖͍෼͚͍ͨ

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• ࣮ࡍͷྫʢͱ͋ΔϦϙδτϦͷ User Ϟσϧʣ ಈػ - ςετΛ଎͍ͨ͘͠ create 0.945ms build 0.001ms build_stubbed 0.004ms

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• ࣮ࡍͷྫʢͱ͋ΔϦϙδτϦͷ User Ϟσϧʣ ಈػ - ςετΛ଎͍ͨ͘͠ create 0.945ms build 0.001ms build_stubbed 0.004ms

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• ࣮ࡍͷྫʢͱ͋ΔϦϙδτϦͷ User Ϟσϧʣ ಈػ - ςετΛ଎͍ͨ͘͠ create 0.945ms build 0.001ms build_stubbed 0.004ms 🤔

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create Λ build / build_stubbed ʹ͢Δ ͜ͱͰςετΛ଎͘Ͱ͖Δ ಈػ - ςετΛ଎͍ͨ͘͠

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طʹ͋Δෆཁͳ create Λ΍ΊΔ ৽ͨʹෆཁͳ create Λ૿΍͞ͳ͍ ಈػ - ςετΛ଎͍ͨ͘͠

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طଘίʔυ΋৽نͷίʔυ΋νΣοΫͯ͠΄͍͠

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💡ͦ͏͍͏ίʔυΛॻ͍ͯΈΑ͏

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🤖 FactoryStrategist 🕵 https://github.com/neko314/factory_strategist

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͔͜͜Β࣮૷ͷ࿩

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•Rails ΞϓϦͰ͋Δ͜ͱ •RSpec Λར༻͍ͯ͠Δ͜ͱ ࣮૷ - ࠓճͷલఏ

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ 2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 3. ࠷దͳ build strategy ΛબͿ ࣮૷ - ΍Γ͍ͨॲཧ

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ 2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 3. ࠷దͳ build strategy ΛબͿ ࣮૷ - ΍Γ͍ͨॲཧ

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ -> ʮͦͷ··ʯͳͷͰಛʹ΍Δ͜ͱͳ͠ʂ ࣮૷ - ΍Γ͍ͨॲཧ

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ 2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 3. ࠷దͳ build strategy ΛબͿ ࣮૷ - ΍Γ͍ͨॲཧ

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 2.2. ςετίʔυΛมߋ࣮ͯ͠ݱ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ

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• ෳ੡ͨ͠ϑΝΠϧΛॻ͖׵͑ͯςετ͢Δ • DB ࣗମ͔Β INSERT ͞Ε͍ͯΔ͕ SELECT ͞ Ε͍ͯͳ͍Ϩίʔυ͕ͳ͍͔Λௐ΂Δ ࣮૷ - ࠾༻͠ͳ͔ͬͨ͜ͱ

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• ෳ੡ͨ͠ϑΝΠϧΛॻ͖׵͑ͯςετ͢Δ → 😇ແݶϧʔϓ • DB ࣗମ͔Β INSERT ͞Ε͍ͯΔ͕ SELECT ͞ Ε͍ͯͳ͍Ϩίʔυ͕ͳ͍͔Λௐ΂Δ → ΞϓϦέʔγϣϯ͔Βͷૢ࡞͕೉͔ͬͨ͠ ❓DBͷछྨʹ΋ΑΓͦ͏ʁ ࣮૷ - ࠾༻͠ͳ͔ͬͨ͜ͱ

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 2.2. ςετίʔυΛมߋ࣮ͯ͠ݱ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 2.2. ςετίʔυΛมߋ࣮ͯ͠ݱ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ alias_method :create, :build alias_method :create, :build_stubbed

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 🙆ʮ࡞Γͳ͕ΒඞཁͳॲཧΛ੔ཧ͍ͯ͘͠ʯ ͕Ͱ͖ͨͷͰΑ͔ͬͨ ࣮૷ - ΍Γ͍ͨॲཧ alias_method :create, :build alias_method :create, :build_stubbed

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 🙅1ͭ1ͭͷݕࠪ͸Ͱ͖ͳ͍ ࣮૷ - ΍Γ͍ͨॲཧ alias_method :create, :build alias_method :create, :build_stubbed

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 2.2. ςετίʔυΛมߋ࣮ͯ͠ݱ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ

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2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 2.2. ςετίʔυΛมߋ࣮ͯ͠ݱ͢Δ ࣮૷ - ΍Γ͍ͨॲཧ ҰମͲ͏΍ͬͯ🤔

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2. create ͷՕॴΛ build ΍ build_stubbed ʹͯ͠ ςετΛ࣮ߦ͢Δ 2.1. ςετίʔυΛมߋͤͣʹ࣮ݱ͢Δ 2.2. ςετίʔυΛมߋ࣮ͯ͠ݱ͢Δ ϝλσʔλͱ͍ͯ࣋ͬͯ͠Δ࣮ߦ͢΂͖ςε τίʔυΛղੳͯ͠ॻ͖׵͑Δ ࣮૷ - ݁࿦

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…೉͍͠

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✂೉͍͠໰୊͸খ͘͞෼ղ͢Δ✂

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• ͘͢͝γϯϓϧͳςετͰߟ͑Δ͜ͱʹ͢Δ ࣮૷ # sample_app/spec/models/user_spec.rb 1. require 'rails_helper' 2. 3. RSpec.describe User, type: :model do 4. it { expect(FactoryBot.create(:user)).to be_valid } 5. end

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end ςετΛ࣮ߦ

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end FactoryBotΛར༻͍ͯ͠Ε͹ create Ͱ example.run build Ͱ example.run build_stubbed Ͱ example.run Ͱςετ͕௨Δ͔Ͳ͏͔Λ͔֬ΊΔ

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end ԿΛ͍ͯ͠Δͷ͔?? 🤔

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end # class RSpec::Core::Example::Procsy def call(*args, &block) @executed = true @proc.call(*args, &block) end alias run call

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end example.example.metadata[:block] = > #

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࣮૷ - Ξϓϩʔν 1. RSpec.conf i gure do |conf i g| 2. conf i g.around(:example) do |example| 3. example.run 4. end 5. end example.example.metadata[:block] = > # # sample_app/spec/models/user_spec.rb 1. require 'rails_helper' 2. 3. RSpec.describe User, type: :model do 4. it { expect(FactoryBot.create(:user)).to be_valid } 5. end

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औಘͨ͠procʹͲ͏खΛೖΕΔ͔ʁ🤔 ࣮૷

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΍Γ͍ͨ͜ͱΛ֬ೝ ࣮૷ # sample_app/spec/models/user_spec.rb 1. require 'rails_helper' 2. 3. RSpec.describe User, type: :model do 4. it { expect(FactoryBot.create(:user)).to be_valid } 5. end

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΍Γ͍ͨ͜ͱΛ֬ೝ ࣮૷ # sample_app/spec/models/user_spec.rb 1. require 'rails_helper' 2. 3. RSpec.describe User, type: :model do 4. it { expect(FactoryBot.create(:user)).to be_valid } 5. end build ΍ build_stubbed ʹ͍ͨ͠

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࣮૷ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ จࣈྻ͔Βੜ੒ͨ͠ Proc ΦϒδΣΫτ Ճ޻ͨ͠จࣈྻ ϝλσʔλͷ Proc ΦϒδΣΫτ ࣮ߦ݁Ռ

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࣮૷ ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ

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࣮૷ example.example.metadata[:block].to_s ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ to_s ΍ inspect ͯ͠ΈΔ

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࣮૷ example.example.metadata[:block].to_s # = > "#" ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ to_s ΍ inspect ͯ͠ΈΔ

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࣮૷ example.example.metadata[:block].to_s # = > "#" ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ to_s ΍ inspect ͯ͠ΈΔ 😇

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࣮૷ RubyVM : : AbstractSyntaxTree.of(example.example.metadata[:bl ock]) ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ ASTΛऔಘͯ͠ΈΔ

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࣮૷ RubyVM : : AbstractSyntaxTree.of(example.example.metadata[:bl ock]) # = > # ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ ASTΛऔಘͯ͠ΈΔ

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࣮૷ RubyVM : : AbstractSyntaxTree.of(example.example.metadata[:bl ock]) # = > # ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ ASTΛऔಘͯ͠ΈΔ 😇Ճ޻ʹࣦഊͯ͠அ೦

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࣮૷ module ProcParser ref i ne Proc do def body # RubyVM : : InstructionSequence ͰऔಘͰ͖Δ γʔέϯεΛ΋ͱʹ spec ϑΝΠϧ͔ΒจࣈྻΛऔಘ end end end ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ

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࣮૷ example.example.metadata[:block].body ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ

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࣮૷ example.example.metadata[:block].body # = > " expect(FactoryBot.create(:user)).to be_valid " ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ

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࣮૷ example.example.metadata[:block].body # = > " expect(FactoryBot.create(:user)).to be_valid " ϝλσʔλͷ Proc ΦϒδΣΫτ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ 🎉🎉🎉🎉🎉🎉

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࣮૷ 🙏 ͘͢͝ࢀߟʹ͠·ͨ͠ʂ 🙏 Ruby ͷϒϩοΫߏจͷத਎Λจࣈྻͱͯ͠औಘ͢Δ by @osyo-manga https://secret-garden.hatenablog.com/entry/ 2019/09/08/145037

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࣮૷ ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ Ճ޻ͨ͠จࣈྻ " expect(FactoryBot.create(:user)).to be_valid\n"

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࣮૷ " expect(FactoryBot.create(:user)).to be_valid\n" .gsub("create", "build") ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ Ճ޻ͨ͠จࣈྻ " expect(FactoryBot.create(:user)).to be_valid\n"

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࣮૷ " expect(FactoryBot.create(:user)).to be_valid\n" .gsub("create", "build") ఆٛ͞Ε͍ͯΔखଓ͖ͷจࣈྻ Ճ޻ͨ͠จࣈྻ " expect(FactoryBot.create(:user)).to be_valid\n" " expect(FactoryBot.build(:user)).to be_valid\n"

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࣮૷ Ճ޻ͨ͠จࣈྻ จࣈྻ͔Βੜ੒ͨ͠ Proc ΦϒδΣΫτ " expect(FactoryBot.build(:user)).to be_valid\n"

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࣮૷ new_body = "Proc.new { " expect(FactoryBot.build(:user)).to be_valid\n" }" eval(new_body) Ճ޻ͨ͠จࣈྻ จࣈྻ͔Βੜ੒ͨ͠ Proc ΦϒδΣΫτ " expect(FactoryBot.build(:user)).to be_valid\n"

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࣮૷ new_example = eval(new_body) # = > # จࣈྻ͔Βੜ੒ͨ͠ Proc ΦϒδΣΫτ ࣮ߦ݁Ռ

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࣮૷ def run_successfully?(example) example.call true rescue StandardError false end จࣈྻ͔Βੜ੒ͨ͠ Proc ΦϒδΣΫτ ࣮ߦ݁Ռ

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࣮૷ new_example = eval(new_body) # = > # จࣈྻ͔Βੜ੒ͨ͠ Proc ΦϒδΣΫτ ࣮ߦ݁Ռ run_successfully?(new_example) True / False

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࣮૷ Ҏ্ ͕ create Λ build ʹͯ͠ςετΛ࣮ߦ͢Δํ๏Ͱͨ͠ build_stubbed ΋ಉ༷Ͱ͢

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ 2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 3. ࠷దͳ build strategy ΛબͿ ࣮૷ - ΍Γ͍ͨॲཧ

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ 2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 3. ࠷దͳ build strategy ΛબͿ ࣮૷ - ΍Γ͍ͨॲཧ

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1. create ͍ͯ͠ΔςετΛͦͷ··࣮ߦ͢Δ 2. create ͷՕॴΛ build ΍ build_stubbed ʹ͠ ͯςετΛ࣮ߦ͢Δ 3. ࠷దͳ build strategy ΛબͿ 3.1. ϝοηʔδΛग़ྗ ࣮૷ - ΍Γ͍ͨॲཧ

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࣮૷ ࣮ߦ݁Ռ build strategy ςετ͕௨Βͳ͍ - build Ͱύε build build_stubbed Ͱύε build_stubbed create Ͱύε create build strategyͷબͼํ

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🎉੒Ռ🎉

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੒Ռ $ FATORYSTRATEGIST=1 bin/rspec spec/models/user_spec.rb "./spec/models/user_spec.rb:4 create can be replaced to build" . Finished in 0.03062 seconds ( fi les took 5.47 seconds to load)1 example, 0 failures

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͜Ε͔Βͷ࿩

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• ࡶͳ gsub Λ΍Ίͯʮ1ͭ1ͭͷ create ΛνΣο Ϋ͢ΔʯΛ࣮ݱ͍ͨ͠ • ΑΓෳࡶͳςετίʔυʹରԠ͍ͨ͠ • ग़ྗϝοηʔδΛΘ͔Γ΍͍ͨ͘͢͠ • ଞͷςετϑϨʔϜϫʔΫͰ΋࢖͑ΔΑ͏ʹͨ͠ ͍ ͜Ε͔Β΍Γ͍ͨ͜ͱ

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• ͜Μͳʹ೉͍͠ͱ͸… • ASTɺISeq ΛॳΊͯࣗ෼Ͱ৮ͬͨʂ • Ruby 3.1 ͷ AST ָ͕͠Έ • ࢼߦࡨޡ͸͍͍ͧ ײ૝

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͋Γ͕ͱ͏͍͟͝·ͨ͠🙂