jsonopt.scala

object JsonTest extends App {

  object Implicits {
    implicit final class EnhancedJsObject(obj: JsObject) {
      def +?[A](tuple: (String, Option[A]))(implicit writes: Writes[A]): JsObject = {
        tuple match {
          case (key, Some(value)) => obj ++ Json.obj(key -> writes.writes(value))
          case (key, None) => obj
        }
      }
      def ++?[A](values: Seq[(String, Option[A])])(implicit writes: Writes[A]): JsObject = {
        values.foldLeft(obj)((o, tuple) => o +? tuple)
      }
    }
  }

  import Implicits._


  val opt1 = Some("yo")
  val opt2 = Some(1234L)
  val opt3: Option[String] = None
  val opt4: Option[Integer] = None

  val json = Json.obj(
    "hello" -> "World",
    "opt1" -> opt1,
    "opt2" -> opt2
  ) ++? Seq(
    "opt3" -> opt3
  ) +? (
    "opt4" -> opt4
  )

  println(Json.prettyPrint(json))

}