Unable to convert generic case class to json using “writes”

Question

I have a class which I want to be able to convert to json:

case class Page[T](items: Seq[T], pageIndex: Int, pageSize: Int, totalCount: Long)

object Page {

  i         


        

Answer 1

maybe you can write something like:

    case class Page(items: JsValue, pageIndex: Int, pageSize: Int, totalCount: Long)

Put the JsValue instead of the Seq[T]

here is my code example:

    case class ResponseObject(state:Int = 1,data:JsValue)

    case class City(id:Int,name:String,sort:String){
      require(id > 0)
    }

      def list = Action {
        implicit val cityFormat:Format[City] = Json.format[City]
        implicit val responseFormat=Json.format[ResponseObject]
        Ok(Json.toJson(ResponseObject(data=Json.toJson(City.list)))).as("application/json")
      }