Lock in $30 Savings on PRO—Offer Ends Soon! ⏳

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
85
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
69
ActiveRecord Observers - RORLab Season 3-6
Avatar for seapy seapy
0
47
ActiveRecord Callbacks - RORLab Season 3-5
Avatar for seapy seapy
0
46
Rails Database Migrations - RORLab Season 3-3
Avatar for seapy seapy
2
99

Other Decks in Programming

See All in Programming
チームをチームにするEM
Avatar for hitode909 hitode909
0
350
【Streamlit x Snowflake】データ基盤からアプリ開発・AI活用まで、すべてをSnowflake内で実現
Avatar for Ayumu Yamaguchi ayumu_yamaguchi
1
120
俺流レスポンシブコーディング 2025
Avatar for TAK tak_dcxi
14
9.2k
モデル駆動設計をやってみよう ワークショップ開催報告(Modeling Forum2025) / model driven design workshop report
Avatar for haru860 haru860
0
280
ゆくKotlin くるRust
Avatar for TATSUNO Yasuhiro exoego
1
130
GISエンジニアから見たLINKSデータ
Avatar for nokonoko1203 nokonoko1203
0
180
안드로이드 9년차 개발자, 프론트엔드 주니어로 커리어 리셋하기
Avatar for Seungmin 마량 maryang
1
130
Tinkerbellから学ぶ、Podで DHCPをリッスンする手法
Avatar for Tomofumi Kondo tomokon
0
140
ELYZA_Findy AI Engineering Summit登壇資料_AIコーディング時代に「ちゃんと」やること_toB LLMプロダクト開発舞台裏_20251216
Avatar for 株式会社ELYZA elyza
2
450
Context is King？ 〜Verifiability時代とコンテキスト設計 / Beyond "Context is King"
Avatar for r-kagaya rkaga
10
1.4k
AIコーディングエージェント（Manus）
Avatar for kondai kondai24
0
200
Rubyで鍛える仕組み化プロヂュース力
Avatar for muryoimpl muryoimpl
0
150

Featured

See All Featured
Statistics for Hackers
Avatar for Jake VanderPlas jakevdp
799
230k
[RailsConf 2023] Rails as a piece of cake
Avatar for Vladimir Dementyev palkan
58
6.2k
Ethics towards AI in product and experience design
Avatar for Skipper Chong Warson skipperchong
1
140
Kristin Tynski - Automating Marketing Tasks With AI
Avatar for Tech SEO Connect techseoconnect
PRO
0
110
State of Search Keynote: SEO is Dead Long Live SEO
Avatar for Ryan Jones ryanjones
0
63
Into the Great Unknown - MozCon
Avatar for Noah Learner thekraken
40
2.2k
Marketing to machines
Avatar for Jono Alderson jonoalderson
1
4.3k
Test your architecture with Archunit
Avatar for Yoan thirion
1
2.1k
Unlocking the hidden potential of vector embeddings in international SEO
Avatar for Frank van Dijk frankvandijk
0
120
svc-hook: hooking system calls on ARM64 by binary rewriting
Avatar for Akira Moroo retrage
1
18
A Tale of Four Properties
Avatar for Chris Coyier chriscoyier
162
23k
Tips & Tricks on How to Get Your First Job In Tech
Avatar for Honza Javorek honzajavorek
0
390

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.