Railsã®Migrationã§æ—¢å˜ã®ãƒ‡ãƒ¼ã‚¿ã«å¯¾ã™ã‚‹ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã‚’与ãˆã‚‹æ–¹æ³• | ã²ãŸã™ã‚‰ãƒ¡ãƒ¢ã™ã‚‹ã ã‘ã®ãƒ–ãƒã‚°def self.up add_column :posts, :rendering_mode, :string, :default => "plain" end def self.down remove_column :posts, :rendering_mode end ã“ã‚Œã§ã¯ã€æ–°ã—ã„データã«ã¯ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã¯ä¸Žãˆã‚‰ã‚Œã¾ã™ãŒã€æ—¢å˜ã®ãƒ‡ãƒ¼ã‚¿ã«å¯¾ã—ã¦ã¯ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã‚’与ãˆã‚‹ã“ã¨ã¯ã§ãã¾ã›ã‚“。ã“ã®å ´åˆã€update_allを利用ã—ã¦ã€ä¸‹è¨˜ã®ã‚ˆã†ã«è¨˜è¿°ã™ã‚‹ã¨ã€ä»Šã¾ã§ã®ãƒ‡ãƒ¼ã‚¿ã‚’æ›´æ–°ã—ã¦ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã‚’与ãˆã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ def self.up add_column :posts, :rendering_mode, :string, :default => "plain" Post.update_all ["rendering_mode = ?","plain"] end def self.down
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