padrino blog tutorial migrateExistingPostsToFirstAccount

migrateExistingPostsToFirstAccount.rb

Sequel.migration do
  up do
    first_account_id = from(:accounts).get(:id)

    if first_account_id
      from(:posts).update(account_id: first_account_id)
    end
  end

  down do
    from(:posts).update(account_id: nil)
  end
end