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RailsエンジニアのためのNext.js入門
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Kazuhito Hokamura
October 22, 2021
Technology
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RailsエンジニアのためのNext.js入門
Kazuhito Hokamura
October 22, 2021
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Transcript
RailsΤϯδχΞͷͨΊͷ Next.jsೖ Kaigi on Rails 2021
Ubie Discovery Kazuhito Hokamura @hokaccha @hokaccha
ࠓͷ 1. Next.jsͱԿ͔ 2. Next.jsͷػೳɾಛ
Next.jsͱԿ͔
None
None
Next.js gives you the best developer experience with all the
features you need for production: hybrid static & server rendering, TypeScript support, smart bundling, route pre-fetching, and more. No config needed.
Next.jsRailsΛஔ͖͑ΔΑ͏ͳͷʁ
🙅
None
None
ͳͥNext.jsΛ͏ͷ͔
RailsϑϩϯτΤϯυͷϖΠϯ • ಠࣗ࿏ઢͳٕज़ελοΫ • JavaScriptͱhaml/erb͕ࠞ͟Δ • JavaScriptͰඳը͢Δ෦ͷPre Rendering͕ࠔ
Next.jsͩͱ • σϑΝΫτελϯμʔυͳٕज़͔ͭߴ͍։ൃମݧͷڥͰ։ൃͰ͖Δ • JavaScriptʢTypeScriptʣ͚ͩͰϑϩϯτΤϯυ͕݁͢Δ • Pre Rendering͕؆୯ʹ࣮ݱͰ͖Δ
͔͠͠Next.js͚ͩͩͱ • DBͷૢ࡞ϨΠϠʔ͕ͳ͍ • Blitz.jsͷΑ͏ͳϑϨʔϜϫʔΫ͕͋Δ͚Ͳ·ͩະख़
RailsͳͲͱΈ߹Θͤͯ͏ͷ͕ݱঢ়ͩͱϕλʔ
ΞʔΩςΫνϟͷྫ
👩💻 Frontend API Database
👩💻
👩💻
👩💻
͜͜·Ͱͷ·ͱΊ • Next.jsϑϩϯτΤϯυΛओ؟ʹ͓͍ͨϑϨʔϜϫʔΫ • RailsΛͦͷ··ஔ͖͑ΔΑ͏ͳͷͰͳ͍ • όοΫΤϯυ͕ಘҙͳϑϨʔϜϫʔΫͱΈ߹Θͤͯ͏ͷ͕Α͍
Next.jsͷػೳ
ಛతͳػೳ • Zero con fi g • File-system Routing •
Performance Optimization • Pre Rendering
Zero Con fi g
1. ඞཁͳϞδϡʔϧΛΠϯετʔϧ 2. React ComponentΛ࡞Δ 3. next dev Λ࣮ߦ͢Δ Ҏ্ɻ
File-system Routing
GET / GET /posts GET /posts/:id
GET / GET /posts GET /posts/:id
pages/posts/[id].tsx
Performance Optimization
͜͜Ͱ͍͏ύϑΥʔϚϯε Core Web Vitalsతͳҙຯ
Next.jsͷύϑΥʔϚϯε࠷దԽ • σϑΥϧτͰ༷ʑͳϕετϓϥΫςΟεͷద༻ • Code splitting, Critical Rendering Path࠷దԽ, etc...
• next/imageʹΑΔCLS࠷దԽ • next/linkʹΑΔը໘ભҠͷύϑΥʔϚϯε࠷దԽ • Pre RenderingʹΑΔFCP/LCPͷ࠷దԽ
Pre Rendering
Client Side Rendering
Client Side Rendering • ॳظඳըͷύϑΥʔϚϯε͕Ͱͳ͍ • JavaScriptΛ࣮ߦ͠ͳ͍ΫϥΠΞϯτʹऑ͍ʢOGP, SEOʣ
ͦ͜ͰPre Rendering • αʔόʔͰHTMLΛ࡞ͬͯฦ͢ → Server Side Rendering • ͋Β͔͡ΊHTMLΛ࡞͓͍ͬͯͯฦ͢
→ Static Site Generation
࣮ɺӡ༻͕࠷γϯϓϧɻύϑΥʔϚϯεOGPΛؾʹ͠ͳ͍Ͱ͍͍έʔεͰબͿ ύϑΥʔϚϯε࠷ڧɻ੩తʹੜͰ͖ͯύϑΥʔϚϯεʹͩ͜ΘΓ͍ͨέʔεͰ͜Ε ੩తʹੜ͢Δͷແཧ͚ͩͲॳظඳըͷύϑΥʔϚϯεOGP୲อ͍ͨ͠߹ʹ࠷ऴతʹબͿɻ ͦ͏͍͏έʔεͦΕͳΓʹ͋Δ🥲 Client Side Rendering Static Site Generation
Server Side Rendering ※ Incremental Static Regeneration ͱ͍͏ͷ͋Δ͚Ͳ࣌ؒͷ߹ͰׂѪ
SSR, SSG, CSRซ༻Մೳ • ಈతʹσʔλ͕มΘΔϖʔδSSR • ࣄલʹσʔλ͕Θ͔ΔϔϧϓϖʔδSSG • ύϑΥʔϚϯεOGPΛؾ͠ͳ͍ཧը໘CSR
Server Side Rendering ϦΫΤετΛड͚ͨͱ͖ʹ getServerSideProps͕࣮ߦ ͞ΕΔͷͰpropsΛ࡞ͬͯ͢
Static Site Generation Ϗϧυ࣌ʹgetStaticPathsͱ getStaticProps͕ݺΕͯಈత ʹ੩తϑΝΠϧΛੜ͢Δ
·ͱΊ
·ͱΊ • Next.jsRailsΛஔ͖͑ΔͷͰͳ͘ڞଘ͍ͯ͘͠ͷ • Next.jsͷ։ൃମݧେมΑ͍ͷͰҰճͬͯΈͯ΄͍͠ • Rails͕͖ͳΤϯδχΞͳΒ͖ʹͳΔͱࢥ͏ɺͨͿΜʂ
͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ