app/serializers/v3/activation_serializer.rb
class V3::ActivationSerializer < ApplicationSerializer
attributes :id, :system_id, :service
attributes :regcode, :name, :status, :starts_at, :expires_at, :type
%i[regcode name status starts_at expires_at].each do |name|
define_method(name) do
object.try(:subscription).try(name)
end
end
def type
object.try(:subscription).try(:kind)
end
has_one :service, serializer: V3::ServiceSerializer
end