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

ActiveRecord Associations(2) - RORLab Season 3-8

Sponsored · Your Podcast. Everywhere. Effortlessly. Share. Educate. Inspire. Entertain. You do you. We'll handle the rest. →
Avatar for seapy seapy
June 04, 2013
Programming
0
49

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
87
boot2docker 사용시 컨테이너에서 생성한 데이터를 유지하기
Avatar for seapy seapy
0
83
Elasticsearch + fluentd for Log analysis
Avatar for seapy seapy
3
10k
ActiveRecord Associations(1) - RORLab Season 3-7
Avatar for seapy seapy
0
71
ActiveRecord Observers - RORLab Season 3-6
Avatar for seapy seapy
0
49
ActiveRecord Callbacks - RORLab Season 3-5
Avatar for seapy seapy
0
48
Rails Database Migrations - RORLab Season 3-3
Avatar for seapy seapy
2
100

Other Decks in Programming

See All in Programming
Fluid Templating in TYPO3 14
Avatar for Simon Praetorius s2b
0
130
CSC307 Lecture 09
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
1
840
今こそ知るべき耐量子計算機暗号(PQC)入門 / PQC: What You Need to Know Now
Avatar for mackey0225 mackey0225
3
380
CSC307 Lecture 02
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
1
780
15年続くIoTサービスの SREエンジニアが挑む 分散トレーシング導入
Avatar for Melonps melonps
2
220
AIによる開発の民主化を支える コンテキスト管理のこれまでとこれから
Avatar for Mulyu mulyu
3
380
20260127_試行錯誤の結晶を1冊に。著者が解説 先輩データサイエンティストからの指南書 / author's_commentary_ds_instructions_guide
Avatar for nash_efp nash_efp
1
980
高速開発のためのコード整理術
Avatar for sutetotanuki sutetotanuki
1
410
AI Agent の開発と運用を支える Durable Execution #AgentsInProd
Avatar for izumin5210 izumin5210
7
2.3k
AIエージェント、”どう作るか”で差は出るか？ / AI Agents: Does the "How" Make a Difference?
Avatar for r-kagaya rkaga
4
2k
CSC307 Lecture 03
Avatar for Javier Gonzalez-Sanchez javiergs
PRO
1
490
コントリビューターによるDenoのすゝめ / Deno Recommendations by a Contributor
Avatar for petamoriken / 森建 petamoriken
0
200

Featured

See All Featured
No one is an island. Learnings from fostering a developers community.
Avatar for Antonio thoeni
21
3.6k
Design of three-dimensional binary manipulators for pick-and-place task avoiding obstacles (IECON2024)
Avatar for konakalab konakalab
0
350
The innovator’s Mindset - 
Leading Through an Era of Exponential Change - McGill University 2025
Avatar for Jean-Marc De Jonghe jdejongh
PRO
1
93
Information Architects: The Missing Link in Design Systems
Avatar for Michelle Chin soysaucechin
0
780
Lightning talk: Run Django tests with GitHub Actions
Avatar for Sarah Abderemane sabderemane
0
120
[RailsConf 2023 Opening Keynote] The Magic of Rails
Avatar for Eileen M. Uchitelle eileencodes
31
9.9k
How GitHub (no longer) Works
Avatar for Zach Holman holman
316
140k
Improving Core Web Vitals using Speculation Rules API
Avatar for Sergey Chernyshev sergeychernyshev
21
1.4k
Max Prin - Stacking Signals: How International SEO Comes Together (And Falls Apart)
Avatar for Tech SEO Connect techseoconnect
PRO
0
86
Skip the Path - Find Your Career Trail
Avatar for Mark Kilby mkilby
0
57
AI Search: Implications for SEO and How to Move Forward - #ShenzhenSEOConference
Avatar for Aleyda Solis aleyda
1
1.1k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
Avatar for Joe Casabona jcasabona
34
2.6k

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.