required: spray.httpx.marshalling.ToResponseMarshallable Error

[miki haiat]

Hey im pretty new to Spray and reactive mongo .

Im trying to return a list of result as json but i'm having some issue with converting the result to list of json.

this is my model

import reactivemongo.bson.BSONDocumentReader
import reactivemongo.bson.BSONObjectID
import reactivemongo.bson.Macros

case class Post(id: BSONObjectID, likes: Long, message: String, object_id: String, shares: Long)

object Post {
  implicit val reader: BSONDocumentReader[Post] = Macros.reader[Post]
}

and this is the route

val route1 =
    path("posts") {
      get{
        respondWithMediaType(`application/json`) {
          val res: Future[List[Post]] = mongoService.getAll()
          onComplete(res) {
            case Success(value) => complete(value)
            case Failure(ex)    => complete(ex.getMessage)
          }
        }
      }
    }


error

type mismatch; found : List[com.example.model.Post] required: spray.httpx.marshalling.ToResponseMarshallable

thanks,

miki

[Stevo Slavić]

Hello,

You need to define implicit JsonFormat for com.example.model.Post so that spray.httpx.SprayJsonSupport can provide implicit marshaller, to marshall Post instances to response.

See https://github.com/spray/spray-json#providing-jsonformats-for-case-classes how to do it.

Kind regards,
Stevo Slavic.

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[Stevo Slavić]

Btw, you'll have to provide JsonFormat for used reactivemongo types as well (e.g. BSONObjectID).

Somebody has already done it and made it OSS, see
- https://github.com/zipfworks/sprongo/blob/master/src/main/scala/com/zipfworks/sprongo/ExtendedJsonProtocol.scala
- https://github.com/zipfworks/sprongo
- http://repo1.maven.org/maven2/com/zipfworks/sprongo_2.10/1.1.1/

Kind regards,
Stevo Slavic.

[miki haiat]

Im trying sprongo but i have some issue with this code  i basically copy past it...

class DBDriver(dbUrls: Seq[String], dbName: String, system: Option[ActorSystem]) extends SprongoDB(dbUrls, dbName, system) {
  object Post extends CollectionDAO[Post]("post")
}
not found: type SprongoDB
too many arguments for constructor Object: ()Object
not found: type CollectionDAO