The ContactSerializer for use with the Constant Contact API I'm developing.

actualoutput.json

{
  "email_addresses":[{
    "email_address":"[email protected]"
  }],
  "action_by":"ACTION_BY_VISITOR",
  "id":0,
  "name":{
    "first_name":"Hubert",
    "middle_name":"S",
    "last_name":"Williams"
  },
  "addresses":[],
  "notes":[],
  "custom_fields":[],
  "lists":[]
}

Contact.scala

  case class ContactPhones( home_phone:Option[String] = None, work_phone:Option[String] = None,
                            cell_phone:Option[String] = None)
  case class ContactName( first_name:Option[String] = None, middle_name:Option[String] = None,
                          last_name:Option[String] = None)
  case class Contact(email_addresses:List[EmailAddress], action_by:String, id:Long = 0,
                      status:Option[Status.Value] = None, prefix_name:Option[String] = None,
                      name:Option[ContactName] = None, job_title:Option[String] = None,
                      department_name:Option[String] = None, company_name:Option[String] = None,
                      phone:Option[ContactPhones] = None, fax:Option[String] = None,
                      addresses:List[Address] = List(), notes:List[Note] = List(),
                      custom_fields:List[CustomField] = List(), confirmed:Option[Boolean] = None,
                      insert_time:Option[DateTime] = None, last_update_time:Option[DateTime] = None,
                      lists:List[ContactList] = List(), source:Option[String] = None,
                      source_details:Option[String] = None, source_is_url:Option[Boolean] = None,
                      web_url:Option[String] = None)

ContactSerializer.scala

  object ContactSerializer extends Serializer[Contact] {
    private val Class = classOf[Contact]

    def deserialize(implicit format: Formats): PartialFunction[(TypeInfo, JValue), Contact] = {
      case (TypeInfo(Class, _), json) =>
        json.extract[Contact]
    }

    def serialize(implicit format: Formats): PartialFunction[Any, JValue] = {
      case x:Contact =>
        // Decompose as a normal case class.
        implicit val formats = DefaultFormats
        val contactJson = decompose(x)

        // Extract names and phone numbers to top level
        contactJson.transform {
          case JField("name", contactNameJson) =>
            val contactNameInfo = contactNameJson.extract[ContactName]

            ("first_name" -> contactNameInfo.first_name) ~
            ("middle_name" -> contactNameInfo.middle_name) ~
            ("last_name" -> contactNameInfo.last_name)
        }
    }
  }

desiredoutput.json

{
  "email_addresses":[{
    "email_address":"[email protected]"
  }],
  "action_by":"ACTION_BY_VISITOR",
  "id":0,
  "first_name":"Hubert",
  "middle_name":"S",
  "last_name":"Williams",
  "addresses":[],
  "notes":[],
  "custom_fields":[],
  "lists":[]
}