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Ruby on Rails: GetTextを用ã„ã¦iso-2022-jpã®æ—¥æœ¬èªžãƒ¡ãƒ¼ãƒ«ã‚’é€ä¿¡ - ELECTRIC DOC.
Ruby On Rails ピãƒã‚«ãƒ¼ãƒˆè¡—é“ - validates_uniqueness_of ã¯ãªã‚“ã‹ã‚¹ã‚´ã„ -
Ruby on Rails Tips
validates_uniqueness_ofã®scopeオプションを使ã†éš›ã®æ³¨æ„ - LukeSilvia’s diary
Ruby on Railsæ¤œè¨¼å ±å‘Šæ›¸.pdf
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IBM Developer
Ruby on Rails: Active Relation & Active Model
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