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
Railsでフォロー機能を作るためのモデルの書き方
Search
ima1zumi
May 09, 2020
Programming
1
770
Railsでフォロー機能を作るためのモデルの書き方
This is the presentation I gave at the "First LT Meeting #2" for the students on May 9, 2020.
ima1zumi
May 09, 2020
Tweet
Share
More Decks by ima1zumi
See All by ima1zumi
Ruby Taught Me About Under the Hood
ima1zumi
6
14k
Exploring Reline: Enhancing Command Line Usability
ima1zumi
1
81
10年物のRailsアプリにキャッチアップ!〜コードを読まずに理解したかった〜
ima1zumi
0
91
RubyKaigiの登壇者一覧ページを作った
ima1zumi
0
390
Relineのその後の生活
ima1zumi
0
220
IRB and Reline Kaigi 2024
ima1zumi
0
12
Exploring Reline: Enhancing Command Line Usability
ima1zumi
3
14k
Reline 1分 Cooking
ima1zumi
0
37
続・mruby/cにUTF-8 を実装する
ima1zumi
1
29
Other Decks in Programming
See All in Programming
Select API from Kotlin Coroutine
jmatsu
1
160
SODA - FACT BOOK
sodainc
1
960
A comprehensive view of refactoring
marabesi
0
520
Gleamという選択肢
comamoca
6
720
関数型まつりレポート for JuliaTokai #22
antimon2
0
110
コードの90%をAIが書く世界で何が待っているのか / What awaits us in a world where 90% of the code is written by AI
rkaga
25
16k
從零到一:搭建你的第一個 Observability 平台
blueswen
1
930
生成AIで日々のエラー調査を進めたい
yuyaabo
0
590
来たるべき 8.0 に備えて React 19 新機能と React Router 固有機能の取捨選択とすり合わせを考える
oukayuka
2
760
ASP.NETアプリケーションのモダナイズ インフラ編
tomokusaba
1
280
型付きアクターモデルがもたらす分散シミュレーションの未来
piyo7
0
780
統一感のある Go コードを生成 AI の力で手にいれる
otakakot
0
3k
Featured
See All Featured
Being A Developer After 40
akosma
90
590k
The Straight Up "How To Draw Better" Workshop
denniskardys
233
140k
Docker and Python
trallard
44
3.4k
Build The Right Thing And Hit Your Dates
maggiecrowley
36
2.7k
Chrome DevTools: State of the Union 2024 - Debugging React & Beyond
addyosmani
6
690
[RailsConf 2023] Rails as a piece of cake
palkan
55
5.6k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
53k
Why Our Code Smells
bkeepers
PRO
337
57k
Music & Morning Musume
bryan
46
6.6k
Measuring & Analyzing Core Web Vitals
bluesmoon
7
480
Fantastic passwords and where to find them - at NoRuKo
philnash
51
3.3k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Transcript
RailsͰϑΥϩʔػೳΛ࡞ΔͨΊ ͷϞσϧͷॻ͖ํ ϑΟϤϧυϒʔτΩϟϯϓ ΦϯϥΠϯLTձ ima1zumi 2020-05-09
ࣗݾհ - @ima1zumiʢࠓઘ ຑཬʣ - ҎલSIerͰCOBOLͱ͔DB৮ͬͯ·ͨ͠ - Rails ϢʔβʔϑΥϩʔͷϓϥΫςΟεத -
࠷ۙͷझຯɿ͋ͭɺίʔώʔɺࣗ։ൃڥΛ͍͍ײ͡ʹ͢Δ͜ͱ
ςʔϚΛબΜͩཧ༝ - ϢʔβʔϑΥϩʔͰϞσϧʹॻ͘belongs_toͱ͔ has_many͕ढจʹݟ͑Δ - ಡΈํ͕͔Βͳͯ͘Μͩ
͜Ε͔Β͢͜ͱ - ϑΥϩʔػೳΛ࡞ΔʹɺσʔλϕʔεΛͲ͏࡞Ε ͍͍ͷ͔ʢσʔλϕʔεͷʣ - ͦΕΛRailsͰͲ͏ఆٛ͢Δͷ͔ʢRailsͷʣ
ϑΥϩʔɾϑΥϩϫʔͷؔ ͪΌͪΌ·ΔδϡϯΛϑΥϩʔ͍ͯ͠Δ(following) δϡϯͪΌͪΌ·ΔʹϑΥϩʔ͞Ε͍ͯΔ (followed) ͪΌͪΌ·Δ δϡϯ following followed
ྫɿϢʔβʔද JE OBNF ͪΌͪΌ·Δ αϒϨ δϡϯ
ϑΥϩʔΛ࣮͢Δʁ JE OBNF GPMMPXFS@JE GPMMPXFE@JE ͪΌͪΌ·Δ αϒϨ
δϡϯ
JE OBNF GPMMPXFS@JE GPMMPXFE@JE ͪΌͪΌ·Δ
αϒϨ δϡϯ - 1ͭͷηϧʹෳͷ͕ೖΔ - ֤ྻͷΛҰҙʹܾΊΒΕͳ͘ͳΔͷͰɺDBͰNG
2ͭͷςʔϒϧΛ͏ 6TFS JE OBNF ͪΌͪΌ·Δ αϒϨ δϡϯ
GSJFOETIJQ GPMMPXFS@JE GPMMPXFE@JE
RailsͰ͜ͷؔΛදݱ͢Δʹʁ - RailsͰɺΞϓϦέʔγϣϯ͕ѻ͏σʔλͱखଓ͖ Ϟσϧʹॻ͘ - UserϞσϧͱFriendshipϞσϧ - ̎ͭͷϞσϧͷؒʹ͕ؔ͋Δ͜ͱΛఆٛ͢Δ - belongs_to,
has_manyΛ͏
belongs_toؔ࿈͚ - ࣗͷϞσϧͱ૬खͷϞσϧ͕1:1ͷؔͰ͋Δ - ଞํͷϞσϧʹॴଐ(belongs_to)͢Δ - book ͔Βݟͯ author(ஶऀ)ඞͣ1ਓ Ҿ༻ɿIUUQTSBJMTHVJEFTKQBTTPDJBUJPO@CBTJDTIUNM
FriendshipϞσϧ class Friendship < ApplicationRecord belongs_to :follower, # 関係の名前 class_name:
"User" # 関係先モデル名 belongs_to :followed, class_name: "User" end 6TFS JE OBNF ͪΌͪΌ·Δ αϒϨ δϡϯ GSJFOETIJQ GPMMPXFS@JE GPMMPXFE@JE 'SJFOETIJQͱ6TFSͷؔ
has_manyؔ࿈͚ Ҿ༻ɿIUUQTSBJMTHVJEFTKQBTTPDJBUJPO@CBTJDTIUNM - ࣗͷϞσϧͱ૬खͷϞσϧͱ͕1:ଟͷؔͰ͋Δ - ૬खͷϞσϧΛॴ༗(has_many)͢Δ - author ෳͷ book
Λ࣋ͪ͏Δ
UserϞσϧ(following) 1 class User < ApplicationRecord has_many :active_relationships, # Friendshipの言い換え
class_name: "Friendship", # 関連先クラス名 foreign_key: "follower_id", # 関連するカラム名 dependent: :destroy # 関連先が削除されたときに削除する ... end 6TFS JE OBNF ͪΌͪΌ·Δ αϒϨ δϡϯ GSJFOETIJQ GPMMPXFS@JE GPMMPXFE@JE 6TFSͱ'SJFOETIJQଟͷؔ
UserϞσϧ(following) 2 class User < ApplicationRecord ... has_many :following, #
カラム名 through: :active_relationships, # active_relationshipsを通して source: :followed # 関連付け先モデル名 ... end 6TFS͕BDUJWF@SFMBUJPOTIJQTΛ௨ͯ͠ GPMMPXFEͱଟɿଟͷؔΛ࡞Δ
UserϞσϧ(followed) class User < ApplicationRecord has_many :passive_relationships, class_name: "Friendship", foreign_key:
"followed_id", dependent: :destroy has_many :followers, through: :passive_relationships, source: :follower ... end GPMMPXJOHͱ΄΅ಉ͡ ˞TPVSDFGPMMPXFSඞਢͰͳ͍͕GPMMPXJOH ͱܗΛ͋ΘͤΔͨΊʹॻ͍ͯ͋Δ
σʔλͷؔ࿈͚͕Ͱ͖ͨ ϑΥϩʔػೳΛ࣮͢Δʹfollow/unfollowϝιου Λ࡞ͬͨΓɺ ίϯτϩʔϥͱϏϡʔΛ࣮ͨ͠Γ͢Δඞཁ͕͋Δ ͕ɺ ͜ͷLTͰׂѪ
Ϟσϧಉ࢜ͷؔhas_many, belongs_toͳͲͰදͤ Δ Ϟσϧ໊ͷݴ͍͑Λͯ͠ɺUserͱFriendshipʹ followerͱfollowedͷ2ͭͷؔΛ࡞Δ ·ͱΊ
ࢀߟจݙͳͲ ୡਓʹֶͿDBઃܭ పఈࢦೆॻ https://www.amazon.co.jp/dp/B00EE1XPAI/ RailsΨΠυ Active Record ͷؔ࿈͚ https://railsguides.jp/association_basics.html ʲRailsνϡʔτϦΞϧʳϑΥϩʔػೳͷΞιγΤʔγϣϯΛղઆͯ͠ΈΔ
https://sado-tech.hateblo.jp/entry/2018/08/17/201629 RailsνϡʔτϦΞϧ ୈ14ষ ϢʔβʔΛϑΥϩʔ͢Δ https://railstutorial.jp/chapters/following_users?version=5.1#cha-following_users keynoteςϯϓϨʔτ https://github.com/yulily100/Material-Color-Keynote highlight https://github.com/taggon/highlight