ActiveRecord オブジェクトをコピーã™ã‚‹ - 夜㮠Discoveryuser = User.find(:first) user.id # 1 user.name # test clone_user = user.clone dup_user = user.dup # clone ã—ãŸã‚ªãƒ–ジェクト㯠ID ãŒå«ã¾ã‚Œãªã„ clone_user.id # nil dup_user.id # 1 # clone ã—ãŸã‚ªãƒ–ジェクト㯠new_record? == true user.new_record? # nil clone_user.new_record? # true dup_user.new_record? # nil # dup ã§è¤‡è£½ã—ãŸã‚ªãƒ–ジェクトã¯è¤‡è£½å…ƒã‚ªãƒ–ジェクトã®å±žæ€§å€¤ã‚’変更ã™ã‚‹ã¨å€¤ãŒå¤‰ã‚ã‚‹ user.name = 'new name' clone_user.name # test dup_user.name # new name 上記ã®ã‚ˆã†ãª
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ActiveRecord ã®ãŠå‹‰å¼· - elm200 ã®æ—¥è¨˜(æ—§ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼)
http://api.rubyonrails.org/classes/ActiveRecord/Errors.html
ActiveRecord::Base
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Ruby On Rails ピãƒã‚«ãƒ¼ãƒˆè¡—é“ - モデルã®ãƒ†ãƒ¼ãƒ–ルåやプライマリã‚ーåを指定ã™ã‚‹ -
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Rubyã®ã‚³ãƒ¼ãƒ‰ã‹ã‚‰ActiveRecordã ã‘を使ã†æ–¹æ³•
プãƒãƒˆã‚¿ã‚¤ãƒ”ングã«åŠ¹ãRoRã®DB移行・変æ›æ©Ÿèƒ½ ― ï¼ IT
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