Complex Writes[Person] for Working with JSON in Play 2.1 by Greg Methvin

Complex Writes[Person] for Working with JSON in Play 2.1 by Greg Methvin.scala

def idFormat[T]: Format[Id[T]] = Format(
  __.read[Long].map(Id(_)),
  new Writes[Id[T]]{ def writes(o: Id[T]) = JsNumber(o.id) }
)
implicit val personIdFormat = idFormat[Person]
implicit val nameFormat = Json.format[Name]
implicit val personFormat = Json.format[Person]
Json.toJson(Person(Some(Id(1)), Name("Arthur","Dent"), "[email protected]", new LocalDate("1952-03-11")))
// => {"id":1,"name":{"firstName":"Arthur","lastName":"Dent"},"email":"[email protected]","birthDate":"1952-03-11"}