Re: [spray-user] Scala Spray Json implicit error for nested classes:

[Jan-Pieter van den Heuvel]

Hi,

In order to marshall the TodoTxs from/to JSON you also need an implicit JsonFormat for RequestPayload in scope. It should work if you add the following line before your standardTodoFormat:

implicit val requestPayloadFormat = jsonFormat2(RequestPayload.apply)

Hope this helps.

Kind regards,

Jan-Pieter

2016-04-13 18:54 GMT+02:00 ScalaIsCool <huan...@gmail.com>:

I hit the following compile error when using Spray Json for nested classes:

Sbt Compile Error:(10, 48) could not find implicit value for evidence parameter of type:

TodoMarshalling.this.JF[io.github.scalahackers.todo.RequestPayload]  

  implicit val standardTodoFormat = jsonFormat9(TodoTxs.apply)  

                                          ^

Here is code:

trait TodoMarshalling extends SprayJsonSupport
  with FlowMaterializerProvider
  with DefaultJsonProtocol {

  implicit val standardTodoFormat = jsonFormat9(TodoTxs.apply)
  implicit val todoUpdateFormat = jsonFormat8(TodoUpdate.apply)

  def todoFormatFor(baseUrl: String) = new RootJsonFormat[TodoTxs] {
    def read(json: JsValue) = standardTodoFormat.read(json)

    def write(todo: TodoTxs) = {
      val fields = standardTodoFormat.write(todo).asJsObject.fields
      JsObject(fields.updated("url", JsString(baseUrl + '/' + todo.id)))
  }
}

}

case class TodoTxs(id: String, extid: String = "", request: RequestPayload, state: String = "",substate: String = "", response: String = "", priority: Int = 0, starttime: String = "", endtime: String = "")

case class RequestPayload(reqtype: String, reqtask: String)  

Appreciate any advice.

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