知っているようで知らない"rails new"の世界 / The World of "rails new" You Think You Know but Don't

by luccafort

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஌ͬͯΔΑ͏Ͱ஌Βͳ͍ rails newͷੈք ϚωʔϑΥϫʔυ ژ౎։ൃڌ఺ @luccafort 1

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ओཁͳSNS Twitter: @luccafort GitHub: @luccafort Mixi2: @luccafort ࣗݾ঺հ idɿ@luccafort • Kyoto.rb / ؔ੢Rubyձٞ08 /  Go Conference 2025 ΦʔΨφΠβʔ • Kyoto.go ϑΝ΢ϯμʔ • ϚωʔϑΥϫʔυ ژ౎։ൃڌ఺ॴଐ • 2025೥6݄͔ΒϓϩδΣΫτϚωʔδϟʔʹ ͳΓ·ͨ͠ 2

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༏लਓࡐٻΉʂʂʂ 28ଔֶੜͩͱͳ͓Ϥγοʂ ϚωʔϑΥϫʔυͷ ։ൃऀΞΧ΢ϯτ͸ ͪ͜Β ↓↓↓ ࠓ೥11݄͔Βฐࣾʢin Tokyoʣʹ৽ଔೖࣾ͢Δ Denys͘Μ

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໊ݹ԰ڌ఺ͷ Πϯλʔϯืू͸ ͪ͜Β͔Βʂ ↓↓↓↓↓

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“rails new”ΛֶͿ໨తͱഎܠ “rails new”ͷ࣮૷ΛಡΈղ͘ “rails new”͔ΒಘΒΕΔ͜ͱ Agenda 21

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ಥવͰ͕͢…… 22

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“rails new”͕Ͳ͏ಈ͔͘ આ໌Ͱ͖Δਓ 🙋🙋 23

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͍·खΛ͋͛ΒΕͳ͔ͬͨਓ…… 24

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ʮ͋ͳͨʯ͕ର৅ऀͰ͢ɻ 🎉🎉🎉🎉🎉 25

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໨త ͳͥ”rails new”ʹ͍ͭͯ࿩ͦ͏ͱࢥͬͨͷ͔ʁ 26

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໨త ͳͥ”rails new”ʹ͍ͭͯ࿩ͦ͏ͱࢥͬͨͷ͔ʁ 27 • RailsΛΑΓਂ͘ཧղ͔ͨͬͨ͠ • ݸਓ։ൃʮҎ֎ʯͷ੒௕ͷબ୒ࢶͬͯͳΜ͚ͩͬʁ • ؔ੢Rubyձٞ08ɺΑ͔ͬͨΑͶ…… • Ͱ΋ݸਓ։ൃͷѹ͕ڧ͗ͨ͢ؾ΋͢Δ • ݸਓ։ൃͰͳ͍੒௕ͷબ୒ࢶ΋͋ΔΜ͡Όͳ͍͔ʁ

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• RailsΛΑΓਂ͘ཧղ͔ͨͬͨ͠ • ݸਓ։ൃʮҎ֎ʯͷ੒௕ͷબ୒ࢶͬͯͳΜ͚ͩͬʁ • ؔ੢Rubyձٞ08ɺΑ͔ͬͨΑͶ…… • Ͱ΋ݸਓ։ൃͷѹ͕ڧ͗ͨ͢ؾ΋͢Δ • ݸਓ։ൃͰͳ͍੒௕ͷબ୒ࢶ΋͋ΔΜ͡Όͳ͍͔ʁ ໨త ͳͥ”rails new”ʹ͍ͭͯ࿩ͦ͏ͱࢥͬͨͷ͔ʁ 28 ͳʹΑΓίʔυΛಡΜͩΓɺ ॻ͍ͨΓ͢Δͷ͸ָ͍͠ʂʂ

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ํ޲ੑ͸ܾ·͚ͬͨͲ ͡Ό࣮͋ࡍͳʹΛ͢Δͱ͍͍ΜͩΖ͏ʁ 🤔

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࣮ࡍʹRailsΛಈ͔ͯ͠ Irb.pryͰͳʹΛͯ͠Δ͔ ݟΕ͹͍͍͡ΌΜ 30

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࣮ࡍʹRailsΛಈ͔ͯ͠ Irb.pryͰͳʹΛͯ͠Δ͔ ݟΕ͹͍͍͡ΌΜ ͳΔ΄Ͳʁʁʁ 31

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33 ͦ͏͍͑͹”rails new”͕ ͳʹ΍ͬͯΔ͔આ໌Ͱ͖ͳ͘Ͷʁ

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• ͳΜ͔Generatorͱ͔࢖ͬͯͦ͏ɻ • CommandΫϥεΛ࢖࣮ͬͯ૷͞Εͦ͏ • ੲௐ΂ͨؾ͕͢Δ͚Ͳ๨Εͨ…… 34

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“rails new”ΛֶͿ໨తͱഎܠ “rails new”ͷ࣮૷ΛಡΈղ͘ “rails new”ΛಡΉͱݟ͑ͯ͘ΔʮRailsΒ͠͞ʯ Agenda 35

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“rails new”ͷ ࣮૷ΛಡΈղ͘ 36

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1. ίϚϯυղੳ: CLI → Command → ApplicationCommand 2. δΣωϨʔλॳظԽ: AppGenerator.new 3. Φϓγϣϯॲཧ: implied_optionsઃఆ 4. σΟϨΫτϦ࡞੒: create_root → mkdir 5. ϑΝΠϧੜ੒: ςϯϓϨʔτ͔ΒϑΝΠϧ࡞੒ 6. Bundle Install: bundle install࣮ߦ 7. ؀ڥઃఆ: JS/CSS/Hotwireɺafter_bundle_callbacksͷ࣮ߦ 37 Rails new ࣮ߦॱ ͬ͘͟Γ·ͱΊ

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3. Φϓγϣϯॲཧ: implied_optionsઃఆ 4. σΟϨΫτϦ࡞੒: create_root 5. ϑΝΠϧੜ੒: ςϯϓϨʔτ͔ΒϑΝΠϧ࡞੒ 6. Bundle 7. ؀ڥઃఆ: JS/CSS/Hotwireɺafter_bundle_callbacksͷ࣮ߦ 38 Rails new ࣮ߦॱ ͬ͘͟Γ·ͱΊ 1. ίϚϯυղੳ: CLI → Command → ApplicationCommand 2. δΣωϨʔλॳظԽ: AppGenerator.new Rails new ࣮ߦॱ ͬ͘͟Γ·ͱΊ 38 ͕͜͜Θ͔Ε͹ આ໌Ͱ͖ͦ͏ʂ

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CLI͸ͲͷΑ͏ʹͯ͠ݺ͹Ε͍ͯΔ͔ 39

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“rails/cli”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 40

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“rails/cli”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 41

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 42

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 43

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 44

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 45

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 46

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 47

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“rails/command”Ͱ͸ͳʹΛ͍ͯ͠Δ͔ʁ 48

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“ApplicationCommand::Base”Ͱ͸ ͳʹΛ͍ͯ͠Δ͔ʁ 49

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“Rails::Generators::AppGenerator”Ͱ͸ ͳʹΛ͍ͯ͠Δ͔ʁ 50

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“Rails::Generators::AppGenerator”Ͱ͸ ͳʹΛ͍ͯ͠Δ͔ʁ 51

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“Rails::Generators::AppGenerator”Ͱ͸ ͳʹΛ͍ͯ͠Δ͔ʁ 52

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“Rails::Generators::AppGenerator”Ͱ͸ ͳʹΛ͍ͯ͠Δ͔ʁ 53

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“Rails::Generators::AppGenerator”Ͱ͸ ͳʹΛ͍ͯ͠Δ͔ʁ 54

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ίʔϧόοΫ࣮ߦͰ͸ͳʹΛ͍ͯ͠Δ͔ʁ 55

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΍͔ͬͨʂʁʂʁʂʂʂʂ 56

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“rails new”ΛֶͿ໨తͱഎܠ “rails new”ͷ࣮૷ΛಡΈղ͘ “rails new”͔ΒಘΒΕΔ͜ͱ Agenda 57

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“rails new”͔ΒಘΒΕΔ͜ͱ 58

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• ࢓૊ΈΛཧղ͍ͯ͠ͳͯ͘΋Railsʮ͸ʯ࢖͑Δ • ਂ͘ཧղ͢Δʹ͸ʮؔ࿈஌ࣝɾഎܠɾԾઆɾݕূʯ͕ େࣄ ࢓૊ΈΛཧղ͢ΔͱԿ͕خ͍͔͠ 61

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• ਓ͸ʮͰ͖ͦ͏ʯͳ͜ͱ͔͠ʮ΍Γ͍ͨʯͱࢥΘͳ͍ • ਎ۙͳಓ۩ʹର͢ΔཧղΛਂΊΔͱൃ૝ͷ͖͔͚͕ͬ ੜ·ΕΔ ࢓૊ΈΛཧղ͢ΔͱԿ͕خ͍͔͠ 62

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https://www.nlp.co.jp/000015.php 63

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஌͍ͬͯΔͱʮͰ͖Δʯ͜ͱ ͷ෯͕޿͕Δʂ

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https://github.com/onk/rails_app_template/blob/master/ costtie_template.rb ͜ͷtemplateϑΝΠϧΛ࢖͏ͱ ͍ͭ΋࢖͏δΣϜ΍ઃఆ͕શ෦ ೖͬͨঢ়ଶͰ։ൃ͕ελʔτͰ͖ ΔͷͰศར

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࢓૊ΈΛཧղ͢ΔͱԿ͕خ͍͔͠

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࢓૊ΈΛཧղ͢ΔͱԿ͕خ͍͔͠

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• Railsͷίʔυ͸ҙ֎ͱಡΊΔ •ʮΘ͔Βͳ͍ʯ৔߹͸ʮΘ͔Δʯঢ়ଶ·ͰϨϕϧΛ۷Γ Լ͛Α͏ɻʮΘ͔ͬͨʯΒྡ઀ྖҬʹखΛ޿͛Α͏ •ʮΑ͍໰͍ʯ͕Ͱ͖Δ஥ؒ΍ίϛϡχςΟΛݟ͚ͭΑ͏ 68 ·ͱΊ

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$ rails new \ welcome:rails_world! 69

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΍ͬͯΈͯ ବ໨ͩͬͨΒ ਓʹฉ͚ ຊ೔ͷҰ۟

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References • https://github.com/rails/rails/ • Rails Τϯδϯೖ໳ • https://railsguides.jp/engines.html • Rails newͷॲཧΛ௥ͬͯΈͨ • https://qiita.com/okuramasafumi/items/707a74af435f321c1fc2 • ਪ͠׆ͱͯ͠ͷrails new • https://kaigionrails.org/2024/talks/sakahukamaki/ • rails new ͨ࣌͠ͷ௥ՃॲཧΛ͔͘ • https://blog.eiel.info/blog/2013/08/01/rails-new-template/

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References • Rails6ʹ͓͍ͯɺrails newͨ͋͠ͱʹඪ४ػೳΛؒҾ͍ ͍ͯ͘ͱ͖ʹΈΔ΂͖ͱ͜Ζ • https://shinkufencer.hateblo.jp/entry/2020/11/14/000000 • ActiveSupport::CodeGenerator Ͱ༡΅͏ • https://developers.freee.co.jp/entry/activesupport-generator • GemɺRailtieϓϥάΠϯɺEngineʢfull/mountableʣͷҧ ͍ͱͦΕͧΕͷجૅ৘ใ • https://qiita.com/kidach1/items/565c2c077ae8d15fe3a8

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References • ͍͍࣭໰ͬͯͳΜͩΖ͏ • https://note.com/shuharinoshu/n/n6558b8f4adc2 • ϫʔΫγϣοϓʹ͓͚Δ”ྑ͍໰͍"ͱ͸ʁ • https://note.com/yuki_anzai/n/nba5741aa630f