Upgrade to Pro — share decks privately, control downloads, hide ads and more …

ActiveRecord Associations(2) - RORLab Season 3-8

Avatar for seapy seapy
June 04, 2013
Programming
0
47

ActiveRecord Associations(2) - RORLab Season 3-8

about ActiveRecord Polymorphic, Self-join

Avatar for seapy

seapy

June 04, 2013
Tweet

More Decks by seapy

See All by seapy
Lambda + S3 썸네일 생성 및 운영 - AWSKRUG 정기 세미나 (2016년 9월)
Avatar for seapy seapy
1
550
형태소 분석기를 적용한 elasticsearch 운영
Avatar for seapy seapy
0
480
Amazon ec2 container service 소개
Avatar for seapy seapy
0
84
boot2docker 사용시 컨테이너에서 생성한 데이터를 유지하기
Avatar for seapy seapy
0
81
Elasticsearch + fluentd for Log analysis
Avatar for seapy seapy
3
10k
ActiveRecord Associations(1) - RORLab Season 3-7
Avatar for seapy seapy
0
68
ActiveRecord Observers - RORLab Season 3-6
Avatar for seapy seapy
0
47
ActiveRecord Callbacks - RORLab Season 3-5
Avatar for seapy seapy
0
45
Rails Database Migrations - RORLab Season 3-3
Avatar for seapy seapy
2
99

Other Decks in Programming

See All in Programming
Zendeskのチケットを Amazon Bedrockで 解析した
Avatar for ryokosuge ryokosuge
3
310
私の後悔をAWS DMSで解決した話
Avatar for 平目 hiramax
4
210
Navigation 2 を 3 に移行する（予定）ためにやったこと
Avatar for yokomii yokomii
0
250
Compose Multiplatform × AI で作る、次世代アプリ開発支援ツールの設計と実装
Avatar for Takeshi Hagikura thagikura
0
160
開発チーム・開発組織の設計改善スキルの向上
Avatar for 増田 亨 masuda220
PRO
20
11k
詳解！defer panic recover のしくみ / Understanding defer, panic, and recover
Avatar for convto convto
0
240
ファインディ株式会社におけるMCP活用とサービス開発
Avatar for starfish719 starfish719
0
1.4k
CJK and Unicode From a PHP Committer
Avatar for てきめん tekimen youkidearitai
PRO
0
110
Vue・React マルチプロダクト開発を支える Vite
Avatar for ANDPAD inc andpad
0
110
@Environment(\.keyPath)那么好我不允许你们不知道！ / atEnvironment keyPath is so good and you should know it!
Avatar for Elvis Shi lovee
0
120
Navigating Dependency Injection with Metro
Avatar for Zac Sweers zacsweers
3
260
「待たせ上手」なスケルトンスクリーン、 そのUXの裏側
Avatar for teamLab teamlab
PRO
0
530

Featured

See All Featured
Learning to Love Humans: Emotional Interface Design
Avatar for Aarron Walter aarron
273
40k
Six Lessons from altMBA
Avatar for Skipper Chong Warson skipperchong
28
4k
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
Avatar for Michelle Schulp Hunt marktimemedia
31
2.5k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
Avatar for Marc Duiker marcduiker
31
2.2k
ReactJS: Keep Simple. Everything can be a component!
Avatar for Pedro Nauck pedronauck
667
120k
Designing for humans not robots
Avatar for Tammie Lister tammielis
253
25k
10 Git Anti Patterns You Should be Aware of
Avatar for Lemi Orhan Ergin lemiorhan
PRO
656
61k
What's in a price? How to price your products and services
Avatar for Michael Herold michaelherold
246
12k
StorybookのUI Testing Handbookを読んだ
Avatar for Shingo Yamazaki zakiyama
31
6.1k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
18
1.1k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
Avatar for Tammy Everts tammyeverts
8
520
Git: the NoSQL Database
Avatar for Brandon Keepers bkeepers
PRO
431
66k

Transcript

  1. Active Record Associations (2) Ror lab. season 3 - the

    8th round - Jung 4, 2013 ChangHoon Jeong(@seapy)

  2. Product id Employee id Picture Polymorphic Picture employee_id product_id x

  3. Product id Employee id Polymorphic What about this “Picture” model

    ? Picture employee_id product_id Picture product_id employee_id

  4. Polymorphic Picture Picture Employee Product id id Imageable Imageable id

    id imageable_id imageable_id :imageable_id :imageable_type :as => :imageable

  5. Polymorphic Model Class

  6. Polymorphic Migration

  7. Self Joins • ex. : following or follower

  8. 감사합니다.