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ç¬¬43å›žã€€Rails 3ã‚’æ”¯ãˆã‚‹åè„‡å½¹ãŸã¡ ãã®1 - Arel - | gihyo.jp
ã¯ã˜ã‚ã« Ruby on Railsã®2å¹´åŠã¶ã‚Šã®ãƒ¡ã‚¸ãƒ£ãƒ¼ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚¢ãƒƒãƒ—ã§ã‚ã‚‹3.0ã®æ£å¼ãƒªãƒªãƒ¼ã‚¹ãŒã„ã‚ˆã„ã‚ˆé–“è¿‘ã«è¿«ã£ã¦ãã¾ã—ãŸã€‚ Rails 3ã¯ã€ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ãƒ»ãƒ¬ãƒ™ãƒ«ã§ã¯Rails 2.3ã¨ã®äº’æ›æ€§ã‚’ãªã‚‹ã¹ãä¿ã¡ãªãŒã‚‰ã‚‚ã€ãƒ¡ã‚¸ãƒ£ãƒ¼ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚¢ãƒƒãƒ—ã ã‘ã‚ã£ã¦ãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯è‡ªä½“ã¯éš…ã€…ã«ã¾ã§å¾¹åº•çš„ãªãƒªãƒ•ã‚¡ã‚¯ã‚¿ãƒªãƒ³ã‚°ãŒæ–½ã•ã‚Œã¦æ›´ãªã‚‹æ´—ç·´ã‚’é‚ã’ã¦ã„ã¾ã™ã€‚çµæžœã¨ã—ã¦ã€Rails 3ã§ã¯èžé€šã®åŠ¹ã‹ãªã„ãƒ•ãƒ«ã‚¹ã‚¿ãƒƒã‚¯æ§‹é€ ã‚’æ¨ã¦ã¦ã™ã£ãã‚Šã¨ã—ãŸãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ç‹¬ç«‹æ€§ãŒå®Ÿç¾ã•ã‚Œã¦ã„ã‚‹ã®ã§ã™ãŒã€ã“ã®éš›ã«ã€Merbã¨ã®åˆä½µã®å½±éŸ¿ã‚‚ã‚ã£ã¦ã‹ã€ã„ãã¤ã‹ã®æ–°ãŸãªå¤–éƒ¨ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã«ä¾å˜ã™ã‚‹å½¢ã«ãªã£ã¦ã„ã‚‹ã®ã‚‚èˆˆå‘³æ·±ã„ã¨ã“ã‚ã§ã™ã€‚ ãã“ã§æœ¬ç¨¿ã§ã¯ã€ã‚ãˆã¦Rails 3ãã®ã‚‚ã®ã§ã¯ãªãã€ã“ã®Rails 3ã®å¤§æ”¹é€ ã®èˆžå°è£ã‚’æ”¯ãˆã‚‹è£æ–¹ã•ã‚“ã«ã‚¹ãƒãƒƒãƒˆãƒ©ã‚¤ãƒˆã‚’å½“ã¦ã¦ã¿ãŸã„ã¨æ€ã„ã¾ã™ã€‚ Arelã«ã‚ˆã£ã¦ãƒ‘ãƒ©ãƒ€ã‚¤ãƒ ãŒå¤§ããå¤‰ã‚ã£ãŸAct
shimpeiws 2015/12/24
rails

ActiveRecord

Arel
ãƒªãƒ³ã‚¯
Railsã®saveãƒ¡ã‚½ãƒƒãƒ‰ã§true/falseã§ãªãã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’è¿”ã—ãŸã„å ´åˆ - Qiita
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shimpeiws 2015/08/25
ActiveRecord

rails
ãƒªãƒ³ã‚¯
ActiveRecordã§Polymorphicã«Preloadã™ã‚‹ - Qiita
Rubyç”¨ã®Object-Relational Mapperã§ã‚ã‚‹ActiveRecordã‚’ä½¿ã£ã¦ã„ã‚‹ã¨ãã«ã€Polymorphicãªé–¢é€£å…ˆã«å¯¾ã—ã¦æ›´ã«Preloadã™ã‚‹æ–¹æ³•ã«ã¤ã„ã¦è§¦ã‚Œã¾ã™ã€‚ æ–‡è„ˆ ä¾‹ãˆã°ã€Twitterã®é€šçŸ¥ä¸€è¦§ç”»é¢ã®ã‚ˆã†ãªæ©Ÿèƒ½ã‚’é–‹ç™ºã—ã¦ã„ã‚‹ã¨ã—ã¾ã™ã€‚ã“ã®ã¨ãã€Modelã€Controllerã€Viewã‚’ãã‚Œãžã‚Œä»¥ä¸‹ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã«ã—ã¦ã¿ã¾ã™ã€‚ Model # SVO = Subject + Verb + Object class Notification < ActiveRecord::Base belongs_to :object, polymorphic: true belongs_to :subject, class_name: "User" end class FavoriteNotification < Notification end class Ment
shimpeiws 2015/08/24
ActiveRecord
ãƒªãƒ³ã‚¯
Qiitaã®ãƒˆãƒƒãƒ—ãƒšãƒ¼ã‚¸ã®ãƒ•ã‚£ãƒ¼ãƒ‰ã®è¨è¨ˆ - âœ˜â•¹â—¡â•¹âœ˜
@ainame user.articles.preload(:comments, :stocks_count) ã¿ãŸã„ã«stocks_countã®ã‚ˆã†ãªassociationã‚’ç”Ÿã‚„ã—ã¦ãŠã‚Šã€stocks_countã®å†…éƒ¨å®Ÿè£…ã¯PreloaderãŒå¼„ã‚‰ã‚Œã¦ã„ã¦IDã ã‘å–ã£ã¦ã‚‹â€” å†…è£½ãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ (@r7kamura) 2015, 8æœˆ 23 @ainame ã“ã‚Œã‚’æŠ½è±¡åŒ–ã™ã‚‹ãŸã‚ã«ã€Article.has_many(:stocks, counter: true) ã¿ãŸã„ã«ã™ã‚‹ã¨ã€article.stocksã¨article.stocks_countãŒã»ã¼åŒã˜SQLã§åŒæ™‚ã«å®šç¾©ã•ã‚Œã‚‹ã‚ˆã†ã«ãªã£ã¦ã‚‹â€” å†…è£½ãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ (@r7kamura) 2015, 8æœˆ 23 @ainame ãã‚Œã‚’å®Ÿç¾ã—ã¦ã„ã‚‹å®Ÿè£…ãŒã“ã‚Œã§ã™ / k0kubun/activerecord-precount https:
shimpeiws 2015/08/24
ActiveRecord

rails
ãƒªãƒ³ã‚¯
Railsã§before_validationã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯ã‚’ä½¿ã†æ™‚ã®è½ã¨ã—ç©´ - ã¼ããŸã¡å®‡å®™äºº
TL;DR: before_validationã«ç™»éŒ²ã•ã‚Œã¦ã„ã‚‹ã‚³ãƒ¼ãƒ‰ãŒfalseã‚’è¿”ã™ã¨ã€obj.saveã¯falseã‚’è¿”ã—obj.save!ã¯ä¾‹å¤–ã‚’æŠ•ã’ã¾ã™ã€‚DBã«ã¯ä½•ã‚‚ç™»éŒ²ã•ã‚Œã¾ã›ã‚“ã€‚ Railsã®ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯ ä¾¿åˆ©ã§ã™ã‚ˆãï¼ä½¿ã£ã¦ã¾ã™ã‹ï¼Ÿ Active Record Callbacks â€” Ruby on Rails Guides references: ActiveRecord::Callbacks Rails Guidesã®ä¸€ç¯€ã‚’å¼•ç”¨ã—ã¦ã¿ã¾ã™ã€‚ Callbacks are methods that get called at certain moments of an object's life cycle. With callbacks it is possible to write code that will run whenever an Active Record
shimpeiws 2015/04/30
rails

ActiveRecord
ãƒªãƒ³ã‚¯
ActiveRecordã‚’é€Ÿãã—ãŸã„ã ã‘ã®äººç”Ÿã ã£ãŸ - Qiita
Help us understand the probl em. What is going on with this article? Rails3.2ã‹ã‚‰Rails4.2ã«ä¸Šã’ãŸã‚‰ActiveRecordãŒé…ããªã£ãŸã®ã§ã€ã©ã†ã‚„ã£ã¦èª¿æŸ»ã—ã¦ã€ã©ã®ã‚ˆã†ã«å¯¾å‡¦ã—ãŸã‹ã‚’èªžã£ã¦ã¿ãŸã„ã€‚ ã¨ã¦ã‚‚é•·ã„ã®ã§ã€ãƒ€ãƒ«ã„äººã¯æœ€åˆã¨æœ€å¾Œã ã‘èªã‚ã°ã‚ˆã„ã§ã™ã€‚ TL;DR ç’°å¢ƒ: Ruby 2.1.5 ARã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’å¤§é‡ã«(ã–ã£ãã‚Š750kãã‚‰ã„)loadã™ã‚‹ãƒãƒƒãƒå‡¦ç† 3.2ç³»ã§ã®å®Ÿè¡Œæ™‚é–“ã¯ç´„480secã€ 4.2ç³»ã§ã¯ç´„2900sec ç´„6å€ã®æ€§èƒ½åŠ£åŒ– åŽŸå› : preloadã§æ€§èƒ½åŠ£åŒ–ã—ã¦ãŸ CollectionProxyã®ç”Ÿæˆå‘¨ã‚Šã§é…ããªã£ã¦ãŸ Rails4ã‹ã‚‰ARã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã®1attributeæ¯Žã«Objectç”Ÿæˆã™ã‚‹ã®ã§é…ã„ GCã®æ™‚é–“ã‚‚å¢—ãˆãŸ èª¿æŸ»æ–¹æ³•: Githubã®commitã€Issueã‚’
shimpeiws 2015/04/15
rails

ActiveRecord

ruby
ãƒªãƒ³ã‚¯
Ruby on Rails ã§ NOT IN ãª SQL ã‚’ã‹ãã€‚ | ãã‚“ãªã“ã¨è¦šãˆã¦ãªã„
Rails 4 ã§ NOT ãªæ¡ä»¶ã‚’ã‚‚ã¤ WHERE å¥ ãŒéžå¸¸ã«æ›¸ãã‚„ã™ããªã‚Šã¾ã—ãŸã€‚ Rails 4 ãªã‚‰ NOT IN ãª SQL ã‚‚ç°¡å˜ã«æ›¸ã‘ã¾ã™ã€‚ User.where.not( name: ["hoge","goro"] ) æ¡ä»¶ã«ãƒªã‚¹ãƒˆã‚’æ¸¡ã›ã°ã‚ˆã„ã§ã™ã€‚SQLã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ãªã‚Šã¾ã™ã€‚ SELECT "users".* FROM "users" WHERE ("users"."name" NOT IN ('hoge', 'goro')) ã‚µãƒ–ã‚¯ã‚¨ãƒªã‚‚ä½¿ãˆã¾ã™ã€‚ã“ã‚ŒãŒä¾¿åˆ©ã™ãŽã¦å›°ã‚‹ã€‚ query = User.select(:name) User.where.not name: query SELECT "users".* FROM "users" WHERE ("users"."name" NOT IN (SELECT name FROM "users")) Rails 3 ã®
shimpeiws 2015/02/26
rails

ActiveRecord
ãƒªãƒ³ã‚¯
Rails ã§ååˆ†ã«æ´»ç”¨ã•ã‚Œã¦ã„ãªãã¦ã‚‚ã£ãŸã„ãªã„ ActiveRecord::Relation ã®ãƒ¡ã‚½ãƒƒãƒ‰ TOP 10 - æ‰é¢¨å‘‚2.0 - A Lifelog -
2013å¹´12æœˆ2æ—¥æ›´æ–°: å‚ç…§ã•ã‚Œã‚‹ã“ã¨ãŒå¤šã„ã®ã§ Rails 4 ã®æƒ…å ±ã‚’è¨³æ³¨ã¨ã—ã¦è¿½è¨˜ã—ã¾ã—ãŸã€‚ã¾ãŸã€Rails 4 ã«é–¢ã™ã‚‹æƒ…å ±ã¯ã€ WEB+DB PRESS Vol.73 ãŒéžå¸¸ã«å‚è€ƒã«ãªã‚‹ã®ã§ã€ä¸€èªã‚’ãŠã™ã™ã‚ã—ã¾ã™ã€‚ ã“ã®æ–‡ç« ã¯ Mitch Crowe æ°ã®ãƒ–ãƒã‚°ã‚ˆã‚Š 2012å¹´4æœˆ14æ—¥ã®è¨˜äº‹ã‚’ç¿»è¨³ã—ãŸã‚‚ã®ã§ã™ã€‚ The 10 Most Underused ActiveRecord::Relation Methods http://blog.mitchcrowe.com/blog/2012/04/14/10-most-underused-activerecord-relation-methods/ æ˜¨æ—¥ã¯ ActiveRecord::Relation ã®ã‚³ãƒ¼ãƒ‰ã«è†ã¾ã§æµ¸ã‹ã£ã¦ã€ä½¿ã‚ã‚Œã¦ã„ã‚‹ã®ã‚’ã“ã‚Œã¾ã§å…¨ç„¶è¦‹ãŸã“ã¨ãŒãªã„é¢ç™½ã„ãƒŠã‚²ãƒƒãƒˆã‚’æ€ã„å‡ºã•ã›ã¦ãã‚ŒãŸã€‚ã“ã®è¨˜äº‹ã§ã€ååˆ†ã«æ´»ç”¨
shimpeiws 2015/02/26
ActiveRecord

rails

ruby
ãƒªãƒ³ã‚¯
Railsã®Arelã®Tips - Qiita
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shimpeiws 2014/12/11
rails

ActiveRecord
ãƒªãƒ³ã‚¯
ä¿ºã®RailsåŠ›ãŒç«ã‚’å¹ããœï¼ Railsã®Active Recordç™ºè¡Œæ–¹æ³•ã‚‚ã‚ã‚‚ã‚ã€‚ãã®1ã€‚ - srockstyle
ã“ã®æŠ•ç¨¿ã¯æ›¸ã„ã¦ã‹ã‚‰4å¹´ã¨ã‹ãŸã£ã¦ã¦ã¨ã‚Šã‚ãˆãšæ›¸ãæ–¹ã‚‚ã‚„ã°ã„ã®ã§ä¿®æ£ä¸ã§ã™ï¼ ã“ã‚“ã«ã¡ã¯ã€‚@srockstyleã§ã™ã€‚Railsã¤ã‹ã£ã¦ã¾ã™ã‹ï¼Ÿ Active Recordä½¿ã£ã¦ã¾ã™ã‹ï¼Ÿã€€ã‚¹ãƒ”ãƒ¼ãƒ‰ã¯ã¨ã‚‚ã‹ããªã‚“ã§ã‚‚ã‹ã‚“ã§ã‚‚Active RecordæŒŸã‚ã°ã‚¯ã‚¨ãƒªãŒæ¥½ã«ãªã’ã‚Œã¦ã„ã„ã§ã™ã‚ˆãï¼Ÿ Railsãƒ©ã‚¤ã‚¯ã‚’ã†ãŸã†ãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ã‚‚å¢—ãˆã¦ä¹…ã—ã„æ˜¨ä»Šã§ã™ã—ã€ã¨ã«ã‹ãRailsã®Active Recordã¯å¦ã¶ã®ã«ã™ã”ãä¾¿åˆ©ã ã¨æ€ã„ã¾ã™ã€‚ ä»Šæ—¥ã¯ãã„ã¤ã‚‰ã‚’ã¡ã¾ã¡ã¾ã¨åŸºæœ¬çš„ãªã“ã¨ã‚’ãƒ¡ãƒ¢ã£ã½ãä¸¦ã¹ã¦ã„ãã¾ã™ã€‚å¯¾å¿œãƒãƒ¼ã‚¸ãƒ§ãƒ³ã¯4ç³»ã§ã™ã€‚æ—©é€Ÿæ›¸ã„ã¦ã„ãã¾ã—ã‚‡ã†ã€‚ å‰ææ¡ä»¶ æµè¡Œã«ä¹—ã£ã¦ã€éŸ³æ¥½ã‚¢ãƒ¼ãƒ†ã‚£ã‚¹ãƒˆæƒ…å ±ã‚’å…¥ã‚ŒãŸä»¥ä¸‹ã®ãƒ†ãƒ¼ãƒ–ãƒ«ãŒã‚ã‚‹ã¨ã—ã¾ã™ã€‚ artists albams songs ã“ã‚Œã‚’å‘¼ã³å‡ºã™ãƒ¢ãƒ‡ãƒ«ã•ã‚“ãŒä»¥ä¸‹ã§ã™ã€‚ Artist Albam Song æº–å‚™ã‚ªãƒƒã‚±ãƒ¼ã§ã™ã€‚ã„ã£ã±ã„ã‚ã‚‹ã®ã§ãƒ†ãƒ³ãƒã‚ˆãã€‚
shimpeiws 2014/12/11
rails

ActiveRecord
ãƒªãƒ³ã‚¯
ActiveRecordã®mergeã¯ä½¿ãˆã‚‹å | mah365
mergeã¯mergeã§ã‚‚Hashã˜ã‚ƒãªãã¦ActiveRecord::SpawnMethodsã®mergeãªã®ã§ã™ã€‚ joinå…ˆã®ãƒ†ãƒ¼ãƒ–ãƒ«ã®æ¡ä»¶ã§çµžã‚Šè¾¼ã¿ãŸã„ class Entry < ActiveRecord::Base has_many :comments end class Comment < ActiveRecord::Base belongs_to :entry end ä¾‹ãˆã°ãƒ–ãƒã‚°ã®ã‚¨ãƒ³ãƒˆãƒªãƒ¼ã®å…¬é–‹ãƒ»éžå…¬é–‹ãŒã„ã¤ã§ã‚‚åˆ‡ã‚Šæ›¿ãˆã‚‰ã‚Œã‚‹ã¨ã—ã¦ã€éžå…¬é–‹ã«ãªã£ã¦ã„ã‚‹ãƒ–ãƒã‚°ã®ã‚³ãƒ¡ãƒ³ãƒˆã‚’æŠ½å‡ºã—ãŸã„ãªã€ã¨æ€ã£ãŸã¨ã—ã¾ã™ã€‚ å…¬é–‹ãƒ»éžå…¬é–‹ã‹ã¯entriesãƒ†ãƒ¼ãƒ–ãƒ«ã®published_atã‚«ãƒ©ãƒ ã«DateTimeãŒã‚»ãƒƒãƒˆã•ã‚Œã¦ã„ã‚‹ã‹ã•ã‚Œã¦ã„ãªã„ã‹ã§åˆ†ã‹ã‚‹ã¨ã™ã‚‹ã¨ã€ä»¥ä¸‹ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã«ãªã‚‹ã¨æ€ã„ã¾ã™ã€‚ Comment.joins(:entry).where(entries: { publishe
shimpeiws 2014/12/01
ActiveRecord

Rails
ãƒªãƒ³ã‚¯
Sinatra+ActiveRecord+MySQLã§ã€ç°¡å˜APIã‚µãƒ¼ãƒæ§‹ç¯‰ - Qiita
ã‚µãƒ¼ãƒã‚’ä½¿ã£ãŸiPhoneã‚¢ãƒ—ãƒªã‚’ä½œã‚ŠãŸã‹ã£ãŸã®ã§ã€ç°¡å˜ã«ã‚µãƒ¼ãƒå´ä½œã‚Œãªã„ã‹èª¿ã¹ã¦ã¿ã¾ã—ãŸã€‚çµè«–ã¨ã—ã¦çµæ§‹ç°¡å˜ã«å‡ºæ¥ã‚‹äº‹ãŒåˆ†ã‹ã£ãŸã®ã§ãƒ¡ãƒ¢ãƒ¡ãƒ¢ã€‚ ##å‚è€ƒã«ã—ãŸè¨˜äº‹ Sinatraï¼‹ActiveRecordï¼‹SQLite3ã§ï¼Œè»½é‡ãªWeb-DBé€£æºä¾‹ | tamo's blog å¤§åˆ†å‚è€ƒã«ã•ã›ã¦é ‚ãã¾ã—ãŸã€‚ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã™ï¼ ä»•äº‹ã§ã¯MySQLã‚’ä½¿ã†äº‹ãŒå¤šã„ã®ã§ã€SQLite3ã§ã¯ãªãMySQLã‚’ä½¿ã†äº‹ã«ã—ã¾ã—ãŸã€‚ ##æ‰‹é † Ruby,MySQLã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚’ä½œæˆ Gemfileã‚’ä½œæˆã¨ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« database.ymlã‚’ä½œæˆ Rubyãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä½œæˆ å®Ÿè¡Œ å‹•ä½œç¢ºèª 1. Ruby,MySQLã‚’ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« çµæ§‹ãªé‡ã«ãªã£ãŸã®ã§åˆ¥è¨˜äº‹ã«ã¾ã¨ã‚ã¾ã—ãŸã€‚ã“ã“ãŒä¸€ç•ªé¢å€’(Â´Ð”ï½€) Ruby,MySQLã®ç’°å¢ƒã‚’æ§‹ç¯‰ã™ã‚‹(Macç‰ˆ) #MySQL #Mac #Ruby #ho
shimpeiws 2014/05/21
ruby

MySQL

activerecord

sinatra
ãƒªãƒ³ã‚¯
ActiveRecordã®ä¾¿åˆ©æ©Ÿèƒ½previous_changesï½œTechRacho by BPSæ ªå¼ä¼šç¤¾
ActiveRecordã«ã¯ä¾¿åˆ©ãªprevious_changesã¨ã„ã†ãƒ¡ã‚½ãƒƒãƒ‰ãŒã‚ã‚Šã¾ã™ã€‚ å‰²ã¨çŸ¥ååº¦ãŒä½Žã„ã®ã§ã€ã“ã“ã§ä½¿ã„æ–¹ã‚’ã”ç´¹ä»‹ã—ã¾ã™ã€‚ ï¼ˆ08/26è¿½è¨˜ï¼‰ ã¯ã¦ãƒ–ã§ã”æŒ‡æ‘˜ï¼ˆï¼Ÿï¼‰é ‚ãã¾ã—ãŸãŒã€æ£ç¢ºã«ã¯ActiveRecordã§ã¯ãªãActiveModel::Dirtyã®æ©Ÿèƒ½ã§ã™ã€‚ ã¾ãšã¯changes previous_changesã®å‰ã«åŸºæœ¬ã®changesã§ã™ã€‚ ã“ã‚Œã¯ã€saveã™ã‚‹å‰ã«å¤‰æ›´ã•ã‚ŒãŸattributeã‚’èª¿ã¹ã‚‹æ©Ÿèƒ½ã§ã™ã€‚ ã¾ãšã¯findã—ãŸç›´å¾Œã§ã™ã€‚changed?ã¯å½“ç„¶falseã«ãªã‚Šã¾ã™ã€‚ User.create(name: "Taro") user = User.find(1) user.changed? # => false user.changed [] user.changes # => {} user.changed_attributes # => {
shimpeiws 2014/05/19
rails

ActiveRecord
ãƒªãƒ³ã‚¯
Railsã§å¤šå¯¾å¤šã®ãƒ¢ãƒ‡ãƒ«ã‚’ç°¡å˜ã«æ‰±ãˆã‚‹has_many :through - ã“ã®ãƒ–ãƒã‚°ã¯è¨¼æ˜Žã§ããªã„ã€‚
Entryã¨Tagã¨ã„ã†ãƒ¢ãƒ‡ãƒ«ãŒã‚ã£ã¦ã€Entryã«ã¯è¤‡æ•°ã®Tagã‚’ä»˜ã‘ã‚‹ã“ã¨ãŒã§ãã€ã‚ã‚‹TagãŒä»˜ã„ãŸEntryãŒè¤‡æ•°ã‚ã‚‹ã¨ãã€‚ã¤ã¾ã‚Šã€å¤šå¯¾å¤šã®é–¢ä¿‚ãŒã‚ã‚‹ã¨ã—ã¾ã™ã€‚ã“ã®ã‚ˆã†ãªå ´åˆãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ä¸Šã¯ã€entriesãƒ†ãƒ¼ãƒ–ãƒ«ã¨tagsãƒ†ãƒ¼ãƒ–ãƒ«ã¨ã€ãã®é–¢é€£ã‚’è¨˜éŒ²ã™ã‚‹taggingsãƒ†ãƒ¼ãƒ–ãƒ«ã‚’ç”¨æ„ã—ã¾ã™ãã€‚taggingsãƒ†ãƒ¼ãƒ–ãƒ«ã«å¯¾å¿œã™ã‚‹taggingãƒ¢ãƒ‡ãƒ«ã‚’ç”¨æ„ã—ã¾ã™ã€‚ ã§ã€ãƒ¢ãƒ‡ãƒ«ã‚’å®šç¾©ã™ã‚‹æ™‚ã«ã€has_many :throughã‚’ä½¿ã†ã¨ä¾¿åˆ©ã€‚ class Entry < ActiveRecord::Base has_many :taggings has_many :tags, :through=>:taggings end class Tag < ActiveRecord::Base has_many :taggings has_many :entries, :through=>:taggi
shimpeiws 2013/12/22
rails

ActiveRecord
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