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Immutable ActiveRecord Models
Simple rails history pattern (ActiveRecord)
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ãã“ã¯has_oneを使ã„ã¾ã—ょã†ã‚ˆ - Qiita
Railsã§ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚«ãƒ©ãƒ ã®è¿½åŠ ã‚’è¡Œã†æ–¹æ³• - Qiita
uniqueness: scope を使ã£ãŸãƒ¦ãƒ‹ãƒ¼ã‚¯åˆ¶ç´„方法ã®è§£èª¬ - Qiita
Rails 一æ„性制約ã®ã‹ã‘方｜タケノリ
ã€Ruby On Rails】DBã«ä¸€æ„性を与ãˆã‚‹ãƒ¦ãƒ‹ãƒ¼ã‚¯åˆ¶ç´„（unique）ã®æ£ã—ã„è¨˜è¿°å ´æ‰€ - Qiita
ã€Rails/一æ„性制約】モデルã®ãƒãƒªãƒ‡ãƒ¼ã‚·ãƒ§ãƒ³ã‚’コンソールã§ç¢ºèªã™ã‚‹æ–¹æ³•/複数カラムã¸ã®ä¸€æ„性制約 - Qiita
ActiveRecordã®validatesã§è¡¨ç¤ºã•ã‚Œã‚‹ã‚¨ãƒ©ãƒ¼ãƒ¡ãƒƒã‚»ãƒ¼ã‚¸ã®ãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã‚’変更ã™ã‚‹ - Qiita
Railsã®ActiveRecord::AttributeMethods::Dirtyを使ã£ã¦ã¿ãŸ - stmn tech blog
Railsã®ãƒ¢ãƒ‡ãƒ«ã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤è¨å®š - Qiita
ã€Ruby on Rails】whereã§æœŸé–“を範囲指定ã™ã‚‹æ–¹æ³• - PartyIX
シン・ActiveRecordã§æ—¥ä»˜ãƒ»æ™‚刻ã®ç¯„囲検索をシンプルã«æ›¸ã方法｜TechRacho by BPSæ ªå¼ä¼šç¤¾
Rails ã® ActiveRecord 㧠SQL / Arel を使ã‚ãšã«ä»¥ä¸Šãƒ»ä»¥ä¸‹ãƒ»ã‚ˆã‚Šå°ã•ã„ã®æ¯”較演算を実ç¾ã™ã‚‹ - Qiita
Rails ã«ãŠã‘る日付範囲ã§ç„¡é™å¤§ Float::INFINITY ã®æ‰±ã†æ–¹æ³•ã«ã¤ã„ã¦èª¿ã¹ãŸã“㨠- Qiita
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