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railsで後でunique制約をつける

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コマンドでマイグレーションファイルを作成

rails g migration [テーブル名]
rails g migration Osusume

add_index〜〜のところを追記して、rails db:migrateする

class Osusume < ActiveRecord::Migration[7.0]
  def change
    add_index :osusumes, [:title, :short_title], unique: true
  end
end
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