I have the following route setup, but when my map is returned in the first complete block I get an error:
could not find implicit value for evidence parameter of type spray.httpx.marshalling.Marshaller[scala.collection.immutable.Map[String,String]]
import spray.routing.HttpService
import akka.actor.Actor
import spray.http.HttpRequest
import spray.routing.RequestContext
import spray.json.DefaultJsonProtocol._
class UserServiceActor extends Actor with RestUserService {
def actorRefFactory = context
def receive = runRoute(linkRoute)
}
trait RestUserService extends HttpService {
val userService = new LinkUserService
def linkRoute =
pathPrefix("user" / Segment) {
userId =>
path("link") {
parameters('service ! "YT") {
complete {
Map("status"-> "OK", "auth_url" -> "http://mydomain.com/auth")
}
}
}
}
}
According to this test I should be able to convert a Map to json when DefaultJsonProtocol._ is imported but even that's failing:
val map:Map[String, String] = Map("hi"->"bye")
map.toJson
Cannot find JsonWriter or JsonFormat type class for scala.collection.mutable.Map[String,String]
Not sure what's wrong :(
Someone on the spray mailing list pointed out that the Map being created was a mutable one, spray-json won't marshal that. I changed it to be scala.collection.immutable.Map
and also added the following imports:
import spray.httpx.SprayJsonSupport._
import spray.json.DefaultJsonProtocol._
And now everything works great.