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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