Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
入門 名前
Search
Fujimura Daisuke
March 23, 2019
Programming
25
14k
入門 名前
Fujimura Daisuke
March 23, 2019
Tweet
Share
More Decks by Fujimura Daisuke
See All by Fujimura Daisuke
現役スタートアップCTOが解説する、ソフトウェア開発という仕事の理論・実践・キャリア
fujimura
0
56
庭と負債
fujimura
4
2.3k
AIの時代で我々はどのようにコードを書くのか
fujimura
4
1k
SaaSを作るという仕事について
fujimura
13
6.3k
一文字エイリアスのすすめ
fujimura
0
450
現役CTOが語る!RubyKaigiの楽しみ方
fujimura
0
1.3k
いかにして文系新卒エンジニアが「大きな問い」を大事にするCTOになったのか
fujimura
2
750
Kaigi on Rails 2022 - 既存Railsアプリ攻略法 CTOが見ること・やること・考えること
fujimura
14
5.2k
SimpleDelegator活用のご提案
fujimura
0
1.7k
Other Decks in Programming
See All in Programming
「手軽で便利」に潜む罠。 Popover API を WCAG 2.2の視点で安全に使うには
taitotnk
0
830
The Past, Present, and Future of Enterprise Java
ivargrimstad
0
310
知っているようで知らない"rails new"の世界 / The World of "rails new" You Think You Know but Don't
luccafort
PRO
1
100
MCPで実現するAIエージェント駆動のNext.jsアプリデバッグ手法
nyatinte
7
1.1k
JSONataを使ってみよう Step Functionsが楽しくなる実践テクニック #devio2025
dafujii
1
510
Introducing ReActionView: A new ActionView-compatible ERB Engine @ Rails World 2025, Amsterdam
marcoroth
0
630
rage against annotate_predecessor
junk0612
0
160
Android端末で実現するオンデバイスLLM 2025
masayukisuda
1
120
そのAPI、誰のため? Androidライブラリ設計における利用者目線の実践テクニック
mkeeda
2
260
Oracle Database Technology Night 92 Database Connection control FAN-AC
oracle4engineer
PRO
1
440
奥深くて厄介な「改行」と仲良くなる20分
oguemon
1
510
Updates on MLS on Ruby (and maybe more)
sylph01
1
180
Featured
See All Featured
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
36
2.5k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
The Power of CSS Pseudo Elements
geoffreycrofte
77
6k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
BBQ
matthewcrist
89
9.8k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
CoffeeScript is Beautiful & I Never Want to Write Plain JavaScript Again
sstephenson
162
15k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Producing Creativity
orderedlist
PRO
347
40k
Transcript
ೖ ໊લ Rails Developer Meetup 2019 ౻ଜେհ
ࣗݾհ • ౻ଜେհ • גࣜձࣾϚνϚν • Rails ྺ 10
• https://twitter.com/ffu_ • https://github.com/fujimura
͜ͷൃදʹ͍ͭͯ • ౻ଜ໊લʹͩ͜ΘΓ͕͋Δ • ໊લʹ͍ͭͯͷৄ͍͠આ໌͕ͳ͍ͱৗʑࢥ͍ͬͯͨ • Rails͚ͩͲɺ໊લେࣄͩ͠ɺͦΖͦΖߟ͑Λ·ͱΊ͍ͨͳͱࢥͬͨ • ͪͳΈʹ WEB+DB
Press Ͱ໊લʹ͍ͭͯͷهࣄΛॻ͍͍ͯΔ
໊લͱ • ϓϩάϥϚʔ໊લΛຖ͍ͬͯΔ • ॏཁͳ͜ͱΘ͔͍ͬͯΔ • ͚Ͳɺ໊ͦͦલͬͯԿʁඞཁͳͷʁͳΜͰॏཁͳͷʁྑ໊͍લͷج४ ʁ • ࣮Α͘Θ͔Βͳ͍
͓͠ͳ͕͖ • ໊લศར • ໊લͷΈ • ͳ໊ͥલॏཁͳͷ͔ • ྑ໊͍લͱ •
࣮ ѱ໊͍લ
໊લศར • ·໊ͣલ͕͍͔ʹศརͳπʔϧͰ͋Δ͔Λ֬ೝ͠·͢
໊લΛΘͣʹϓϩάϥϜΛॻ͍ͯΈΑ͏ • ໊લͳ͠ͰϓϩάϥϜॻ͚Δ • Lazy K ͱ͍͏ϓϩάϥϛϯάݴޠͰૉΛੜ͢ΔίʔυʢͷҰ෦ʣ • ͭΒ͍ʂ (SII(S(K(S(S(K(SII(S(S(KS)(S(K(S(KS)))(S(K(S(S(KS)(SS(S(S(KS)K))(KK)))))
(S(S(KS)(S(KK)(S(KS)(S(S(KS)(S(KK)(S(KS)(S(S(KS)(S(KK)(SII))) (K(SI(KK)))))))(K(S(K(S(S(KS)(S(K(SI))(S(KK)(S(K(S(S(KS)K)(S(S(KS)K)I) ...
໊લΛͬͯϓϩάϥϜΛॻ͍ͯΈΑ͏ • Ruby ͱ͍͏ϓϩάϥϛϯάݴޠͰૉΛੜ͢Δίʔυ • ಡΊΔʂ • ཧղͰ͖Δʂ require 'prime'
Prime.each
ͦͦɺͳΜͷͨΊʹ໊લΛ͚ͭΔͷ • ୯ʹศར͔ͩΒɺΑΓਂ͍త͕͋Δ • ໊લͷҙຯΛ͔ͭͬͯɺࡉ෦Λཧղͤͣ࠶ར༻͢ΔͨΊ • ࠷ऴతʹɺੜ࢈ੑͷͨΊ
࠶ར༻ʹΑΔੜ࢈ੑͷ্ʮٕज़ʯͷࠜװ • զʑͳͥ Ruby on Rails ͕ಈ͘ͷ͔Βͳ͍͚Ͳ͑Δ • RailsɺMRIɺσʔλϕʔεɺͦͷଞϛυϧΣΞɺCPU… •
ࡉ෦Λཧղͤͣʹ࠶ར༻Ͱ͖Δ͜ͱ͕ٕज़ͷఆٛͷͻͱͭ • ͜ΕͰਓྨͷੜ࢈ੑ্͕͖ͬͯͨ • ৠؾػؔɺిؾɺίϯϐϡʔλʔ • ϓϩάϥϜͦͷҰͭ
໊લศར ·ͱΊ • ໊લ͕͋Δͱɺ࣮Λಡ·ͳͯ͘ϓϩάϥϜΛ࠶ར༻Ͱ͖Δ • ࠶ར༻Ͱ͖Δͱɺੜ࢈ੑ্͕͕Δ • ศརͲ͜ΖͰͳׂ͍ΛՌ͍ͨͯ͠Δ
໊લͷ͘͠Έ • ໊લ͕͍͔ʹϓϩάϥϛϯάͱ͍͏ٕज़ʹͱͬͯॏཁͳπʔϧͰ͋Δ͔ Θ͔Γ·ͨ͠ • ࠓ໊લͷΈΛ֬ೝ͠·͢
໊લͬͯͳʹ • Կ͔ʹ͍ͭͨϥϕϧͷ͜ͱ ΓΜ͝
໊લͷҙຯͬͯͳʹ • ϥϕϧ͕ରΛʮࢦࣔʯ͍ͯ͠Δ͜ͱ • ʮΓΜ͝ʯͬͯݴ༿ͷҙຯʁΓΜ͝ͷ͜ͱͰ͠ΐɺͱ͍͏ͷΛ͘͠ݴͬ ͨܗ ΓΜ͝
ϓϩάϥϜʹ͓͚Δ໊લͬͯͳʹ • ॲཧʹ͍ͭͨϥϕϧͷ͜ͱ • ϝιουͷྫ find_or_initialze_by model = Model.find(params[:id]) unless
model Model.new(params end
ϓϩάϥϜʹ͓͚Δ໊લͷҙຯͬͯͳʹ • ͦͷݴ༿͕ࢦࣔ͢͠ରʁ • ڍಈʁ • ͳΜ͔ײతʹҧ͍ͦ͏ • ֬ೝ͠·͢
ରΛࢦࣔ͢Δ͜ͱͩͬͨΒ • ʮ౻ଜେհʯͷҙຯɺ͜͜Ͱ͍ͬͯΔਓؒɺͱͳΔ • ʮΓΜ͝ʯͷҙຯɺੈքʹଘࡏ͢ΔΓΜ͝ͷશͯɺͱͳΔ • ※ ͜͜ΒΜͰࢦࣔઆʹແཧ͕͋Δ͜ͱ͕Θ͔ΔɻখઆͷதͷΓΜ͝ͱ ͔ •
find_or_initialize_by ͷରԿͳΜͩʁ • ͏·͍͔͘ͳͦ͏
ڍಈͩͬͨΒ • ActiveRecord::Relation#find_or_initialize_by params Λ ड͚औͬͯΫΤϦΛΈཱͯͯϨίʔυΛ୳ͯ͠…ɻ • ͜Εڍಈɻ͋ΔछϓϩάϥϜʢ࣮ʣͷҙຯͱ͍͑ͦ͏Ͱ͋Δ ͕ɺͦΕʹ͚ͨϥϕϧͱͯ͠ͷ໊લͷҙຯͰͳ͍
• ͜Εͩͱத͕Θ͔Δ͜ͱ͕ҙຯ͕Θ͔Δ͜ͱʹͳͬͯ͠·͏ • ͏·͍͔͘ͳͦ͏
ײతʹΘ͔͍ͬͯΔ • ࢦࣔͩΊɺڍಈͩΊ • ͔͠͠զʑActiveRecord::Relation#find_or_initialize_by ͱ͍͏ϝιου໊ͷҙຯ͕Θ͔Δ • ʮݟ͚ͭΔ͔ɺͳ͔ͬͨΒ࡞Δʯ • ײతʹ͜͏͍͏ʮৼΔ͍ͷઆ໌ʯ͕ҙຯͰ͋Δɺͱࢥ͍ͬͯΔͷ
Ͱ • ※ ͍͑ͯΕΦοέʔɺͱ͍͏ʮҙຯͷ༻આʯ͕ϕʔε
ϓϩάϥϜʹ͓͚Δ໊લͷҙຯ = ৼΔ͍ͷઆ໌ • find_or_initialize_by ͷҙຯʮݟ͚ͭΔ͔ɺͳ͔ͬͨΒ࡞Δʯ • ҙຯ = ৼΔ͍ͷઆ໌
• ͬ͘͠Γ͘Δʂ
໊લͷ͘͠Έ ·ͱΊ • ϓϩάϥϜʹ͓͍ͯɺ • ໊લॲཧʹ͍ͭͨϥϕϧ • ໊લͷҙຯɺৼΔ͍ͷઆ໌
ͳΜͰ໊લॏཁͳͷ • ໊લ͕ศརͳͷΘ͔Γ·ͨ͠ • ΈΘ͔͖ͬͯͨ • Ͱɺ໊લ͕ʮѱ͍ʯͱԿ͕ى͜Δͷʁઆ໌͠·͢
ѱ໊͍લͰى͖Δ͜ͱ • ཧղͷίετ͕ߴ͍ • צҧ͍Ͱόά͕ൃੜ͢Δ • => ੜ࢈ੑ͕Լ͕Δ • ςΫϊϩδʔͷత࠶ར༻ʹΑΔੜ࢈ੑͷ্ɻͦΕΛѱ໊͍લ͛
Δ • ʮΑ͍ʯ໊લॏཁ
͡Ό͋ɺԿ͕Α໊͍લͳͷ • ʰίʔυɾίϯϓϦʔτʱͰௐͯΈ·ͨ͠ • ʮ໋໊ʹ͓͍ͯ࠷ॏཁͳߟྀ͖͢ɺม͕දݱ͢ΔͷΛਖ਼֬ʹ શʹݴ͍ද͍ͯ͠Δ͜ͱʯ • McConnell, Steve. Code
Complete (Kindle Location 6490). Microsoft Press. Kindle Edition) ༁ஶऀ • ʮਖ਼֬ʯͰʮશʯͳ໊લͬͯͲ͏͍͏ঢ়ଶͰ͔͢ʁ => ॻ͍ͯͳ͍ • Կ͕ྑ໊͍લͳͷ͔ॻ͍ͯͳ͍ͷͰɺߟ͑ͯΈ·ͨ͠
Α໊͍લ = ໊લͷҙຯͱ࣮ࡍͷڍಈ͕߹͍ͬͯΔͷ • ཁɺݴ͍ͬͯΔ͜ͱͱ͍ͬͯΔ͜ͱ͕Ұக͍ͯ͠Δ໊લ • ͦΓΌͦ͏ͩΑͶɺͱ͍͏ఆٛͳΜͰ͕͢ɺࡉ͔͘ཧղ͢ΔՁ͕͋Δ • ৄ͘͠આ໌͠·͢
໊લͷҙຯͱڍಈ͕߹͍ͬͯͳ͍ͱ • ໊લͷҙຯ͕ڍಈʹରͯ͠ڱ͗͢Δ • ݴ͍ͬͯΔ͜ͱΛ͍ͬͯͳ͍ • ໊લͷҙຯ͕ڍಈʹରͯ͗͢͠Δ • ͍ͬͯΔ͜ͱΛݴ͍ͬͯͳ͍ •
ͷ͍ͣΕ͔
ύλʔϯ 1: ໊લͷҙຯ͕ڱ͗͢Δ • ʮެ։Λ࠶ઃఆʯͬͯҙຯͳͷʹɺ࣌ࠁΛ࠶ઃఆͰ͖ͯ͠·͏ • ͬͯΔ͜ͱ໊͕લͷΘΓʹ͍ class Article def
reset_publish_date(date) update!(publish_at: date) end end
ύλʔϯ 2: ໊લͷҙຯ͕͗͢Δ • check ͨ݁͠ՌͲ͏ͳΔͷʁ • login ͍ͯ͠Δͷ͕ਖ਼ʁ͍ͯ͠ͳ͍ͷ͕ਖ਼ʁ •
໊લ͔ΒΘ͔Βͳ͍ • check ͷҙຯ͕͗͢Δͷ͕ݪҼ before_action :check_login private def check_login unless current_user redirect_to login_path end; end
Α໊͍લͷ͏Ұͭͷج४ γϯϓϧ͞ • ࠷ίϯύΫτͰత֬ͳදݱΛ͏͠ • ੈͷதʹ employee ͱ͍͏ݴ༿͕͋Δ def person_who_is_hired_by_company
def empolyee
͜͜·Ͱͷ·ͱΊ • Α໊͍લ = ໊લͷҙຯͱ࣮ࡍͷڍಈ͕߹͍ͬͯΔɺγϯϓϧͳ໊લ • ͗ͨ͢Γڱ͗ͨ͢Γ͢Δͱѱ໊͍લʹͳΔ
࣮ ѱ໊͍લ • ۩ମྫΛ͓ಧ͚͠·͢
User#check_paid class User def check_paid # ... end end
User#check_paid ͱ͍͏໊લ͔Βߟ͑ΒΕΔڍಈ • ࢧ͍͕ࡁΜ͔ͩΛ Boolean Ͱฦ͢ • ࢧ͍͕ࡁΜͰ͍ͳ͍߹Ϣʔβʔʹ self.errors ΛՃ͢Δ
• ࢧ͍͕ࡁΜͰ͍ͳ͍߹ྫ֎Λు͘ • check ͷҙຯ͕͗ͯ͢ɺͲΕ͔Θ͔Βͳ͍
User#check_paid ղମ • ͦΕͧΕԼهͷ༷ʹ࣮͞Ε͍ͯΕɺΉ͜ͱͳ͍ͣ • check Λ͏ͷΛΊΔ͚ͩͰ໊લ͕ྑ͘ͳΓ·͢ class User #
ࢧ͍͕ࡁΜ͔ͩΛ Boolean Ͱฦ͢ def paid? # ... end # ࢧ͍͕ࡁΜͰ͍ͳ͍߹ϢʔβʔʹΤϥʔใΛՃ͢Δ def add_error_if_not_paid # ... end end
Notification#user (1) • ௨Λड৴͢ΔϢʔβʔͷ໊લΛ'user'ͱͨ͠ class Notification belongs_to :user end
Notification#user (2) • ʮ͕ࣗૹͬͨ௨Λফ͢ʯͨΊʹɺԼهͷΑ͏ͳίʔυΛॻ͍ͨ • Notification#user ͕ड৴ऀͳͷ͔ૹ৴ऀͳͷ͔ɺ໊લ͔ΒΘ͔Βͳ͍ sent_notifications = Notification.where(user:
current_user) # user = ड৴ͨ͠ਓͳͷͰɺࣗͷ௨͕ফ͑Δ sent_notifications.delete_all
Notification#user (3) • 'recipient'ͱ͓͚ͯ͠ɺ໊લ͔Βड৴ऀͰ͋Δ͜ͱ͕Θ͔ΔͷͰɺ͜ͷ Α͏ͳࣄނى͖ͳ͍ • ໘ͰׂʹԠ໊ͨ͡લΛ͚ͭΔΑ͏ʹ͠·͠ΐ͏ # ໊લ͔Β໌Β͔ʹม sent_notifications
= Notification.where( recipient: current_user )
༨ஊ • ͔͜͜Β໊લʹ·ͭΘΔ༨ஊͰ͢
UserRegistrationService ͷ’Service'ͬͯඞཁʁ UserRegistrationService.new.perform! UserRegistration.new.perform! # Service͍Βͳ͘ͳ͍ʁ
໊લͷωλݩ • schema.org • Google, Microsoft, Yahoo, Yandex ͕࡞ͬͨΠϯλʔωοτ༻ͷޠኮू •
ςʔϒϧઃܭΜͩ࣌͜͜ΛݟΕ݁ߏࡌ͍ͬͯΔ
ࣙॻ.app • ໊લͷͨΊʹ࠷ॏཁͳπʔϧࣙॻ • Mac OS X ͷ ࣙॻ.app ਆ
• ͳΜͱӳӳࣙయɺྨޠࣙయɺӳࣙయɺӳࣙయ͕ɺશ෦ແྉͰೖ͍ͬͯΔ • ʮڥઃఆʯ͔ΒՃͰ͖ΔͷͰɺ·ͩͷํ͍·͙͢Ճ͠Α͏