```ruby
class Api::OrderCycleSerializer < ActiveModel::Serializer
  attributes :order_cycle_id, :orders_close_at

  def order_cycle_id
    object.id
  end

  def orders_close_at
    object.orders_close_at.to_s
  end
end
```

Fix rubocop issue: use nested class/module definition
user
```ruby
module Api
  class OrderCycleSerializer < ActiveModel::Serializer
    attributes :order_cycle_id, :orders_close_at

    def order_cycle_id
      object.id
    end

    def orders_close_at
      object.orders_close_at.to_s
    end
  end
end
```
assistant