puyopuyotetr.is/db/migrate/20161003142332_add_confirmable_to_users.rb

# frozen_string_literal: true

class AddConfirmableToUsers < ActiveRecord::Migration[5.0]
  def change
    change_table(:users, bulk: true) do |t|
      t.column :confirmation_token, :string
      t.column :confirmed_at, :datetime
      t.column :confirmation_sent_at, :datetime
      t.column :unconfirmed_email, :string
    end
    add_index :users, :confirmation_token, unique: true
  end
end