How to represent optional fields in spray-json?

Question

I have an optional field on my requests:

case class SearchRequest(url: String, nextAt: Option[Date])

My protocol is:

object Sea         


        

Answer 1

Easy.

import cc.spray.json._
trait MyJsonProtocol extends DefaultJsonProtocol {
  implicit val searchFormat = new JsonWriter[SearchRequest] {
    def write(r: SearchRequest): JsValue = {
      JsObject(
        "url" -> JsString(r.url),
        "next_at" -> r.nextAt.toJson,
      )
    }
  }
}

class JsonTest extends FunSuite with MyJsonProtocol {
test("JSON") {
    val search = new SearchRequest("www.site.ru", None)
    val marshalled = search.toJson
    println(marshalled)
  }
}