ã€Rails】migrationã®changeã¨up/downã£ã¦ä½•ãŒé•ã†ã®ï¼Ÿ - tanihiro.logRailsã§migrationを作æˆã™ã‚‹æ™‚ã€changeメソッドã ã‘ãŒå®šç¾©ã•ã‚Œã¦ã„ãŸã‚Šã€upã¨downメソッドã®2ã¤ãŒå®šç¾©ã•ã‚Œã¦ã„る時ãŒã‚ã‚Šã¾ã™ã€‚ class AddColumnHoge < ActiveRecord::Migration def change end end class ChangeColumnHoge < ActiveRecord::Migration def up end def down end end ã“ã‚“ãªé¢¨ã«ã€migrationファイルを作æˆã—ãŸæ™‚ã®åå‰ã§ã€ç”Ÿæˆã•ã‚Œã‚‹classã®ã²ãªå½¢ãŒé•ã„ã¾ã™ã€‚ up/downã«ã¤ã„㦠upã¨downメソッドã¯ã€migrateを実行ã—ãŸæ™‚ã®å‡¦ç†ã¨ã€rollbackã—ãŸæ™‚ã®å‡¦ç†ã‚’定義ã—ã¾ã™ã€‚ upã§å¤‰æ›´ã—ãŸã‚‚ã®ã¯ã€downã§å…ƒã«æˆ»ã‚‹ã‚ˆã†ã«ã—ã¦ãŠã‹ãªã„ã¨ã€æ£ã—ãrollbackã§ãã¾ã›ã‚“。 class ChangeColumnH
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