migration ã®ä¸ã§ model を触ã£ãŸã‚‰å¿…ãš reset_column_information ã™ã‚‹ - onk.ninjamigration ã®ä¸ã§ model を触ã£ãŸã‚‰å¿…ãš reset_column_information ã™ã‚‹ 治安ã®æ‚ªã„ Rails アプリケーションã§ã¯ã€migrate ä¸ã« model ã®ä¸æ•´åˆã§æ€’られるã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚ class AddAgeToUsers < ActiveRecord::Migration[5.1] def up p User.first # 1 add_column :users, :age, :integer # 2 User.create(name: "Taro", age: 16) # 3 end end 1 㧠User model を触ã£ã¦ã—ã¾ã£ã¦ã„ã‚‹ã®ã§ add_column å‰ã® DB ã®çŠ¶æ…‹ãŒã‚ャッシュã•ã‚Œã¦ 2 ã§è¿½åŠ ã—㟠add_column ã¯åˆ¥ã«ã‚ャッシュをリセットã—ãªã„ã®ã§ 3 㧠ActiveModel::UnknownAttrib
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