ActiveModel::Dirtyã®ãƒ¡ã‚½ãƒƒãƒ‰ã‚’使ã£ã¦å¤‰æ›´ã‚’感知ã—よㆠ- QiitaActiveRecordを使ã£ã¦ã„ã‚‹ã¨æ™‚々プãƒã‚°ãƒ©ãƒ 内ã§Modelオブジェクトã®å€¤ã‚’変更ã—ã¦ã‹ã‚‰ã€å¤‰æ›´å‰ã®å€¤ãŒæ¬²ã—ããªã£ãŸã‚Šã™ã‚‹ã“ã¨ãŒã‚る。 ãã‚“ãªã¨ãã¯ActiveModel::Dirtyã®ãƒ¡ã‚½ãƒƒãƒ‰ã‚’使ã†ã¨Modelã®ã‚ªãƒ–ジェクトã«å¤‰æ›´ãŒã‚ã£ãŸæ™‚ã«å¤‰æ›´ã®æƒ…å ±ã‚’å–得出æ¥ã‚‹ã€‚ # ãŸã¨ãˆã°Userã®ãƒ¬ã‚³ãƒ¼ãƒ‰ã‚’一個引ã£å¼µã£ã¦ã㦠u = User.last => #<User id: 5, age: 19, name: "Kiriko Takemura"> # 変更ã•ã‚Œã¦ã„ãªã„ã“ã¨ãŒç¢ºèªå‡ºæ¥ã‚‹ u.changes => {} u.changed => [] u.changed? => false # åå‰ã‚’変更ã—ã¦ã¿ã‚‹ u.name = "Caroline Charonplop Kyary Pamyu Pamyu" # ã™ã‚‹ã¨changesãŒå¤‰æ›´ã•ã‚ŒãŸãƒ—ãƒãƒ‘ティã®å¤‰æ›´å‰ã¨å¤‰æ›´å¾Œã®ãƒ‡ãƒ¼ã‚¿ãŒå–å¾—ã§
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