validates :uniquenessã¯uniquenessã‚’ä¿è¨¼ã—ãªã„ã®ã§DBã«indexã‚’ã¤ã‘ã¾ã—ょã†ï¼ - YomuKaku MemoRailsã®ActiveRecordã® validates :uniqueness ã‚’ä¿¡ã˜ãã‚‹ã¨æ™‚ã«ä¸å…·åˆã‚’æ‹›ãã¾ã™ã€‚ Railsã®ActiveRecordã§ã¯ã€ validates :uniqueness => true を使用ã™ã‚‹ã“ã¨ã§ã€æŒ‡å®šã—ãŸå±žæ€§ãŒuniqueã§ã‚ã‚‹ã“ã¨ã‚’検証ã§ãã¾ã™ã€‚ 例ãˆã°ã€nameã¨emailã¨ã„ã†å±žæ€§ã‚’æŒã¤Userã¨ã„ã†ã‚¯ãƒ©ã‚¹ã«ã¤ã„ã¦è€ƒãˆã¾ã™ã€‚ ã“ã®å ´åˆã«nameãŒuniqueã§ã‚る（例ãˆã°yamadaã¨ã„ã†nameãŒè¤‡æ•°å˜åœ¨ã™ã‚‹ã“ã¨ã‚’許å¯ã—ãªã„）ã“ã¨ã‚’検証ã™ã‚‹ã«ã¯ã€Userクラスã®ä¸ã§ä»¥ä¸‹ã®ã‚ˆã†ã«validationを記述ã—ã¾ã™ã€‚ class User < ActiveRecord::Base ... validates :name, :presence => true, :uniqueness => true ... end Railsã®ã‚¢ãƒ—リケーション
{{#tags}}- {{label}}
{{/tags}}