Execute raw commands in a MongoDb collection from Play 2 using ReactiveMongo and JSONCollection

Hi I am using ReactiveMongo and Play, and I would like to be able to run a MongoDB command in a collection.

My collection is declared like that :

def thingsJSONCollection : Future[JSONCollection] =
  database.map( connectedDb => 
    connectedDb.collection[JSONCollection]("thingsCollection")
  )

The command I would like to execute is declared like that :

val commandDocument = Json.obj(
    "geoNear" -> "thingsCollection",
    "near" -> Json.obj(
      "type" -> "Point",
      "coordinates" -> Seq(lon, lat)),
    "spherical" -> true,
    "minDistance" -> 0,
    "maxDistance" -> 5000
  )

And finally, here is the code that does not compile :

thingsJSONCollection.map{
  collection => collection.runCommand( commandDocument )
}

When I try to execute the command, I get a long error message that basically says that runCommand does not accept JsObject as argument :

Error:(618, 57) overloaded method value runCommand with alternatives:
  [C <: reactivemongo.api.commands.CollectionCommand](command: C)(implicit writer: collection.pack.Writer[reactivemongo.api.commands.ResolvedCollectionCommand[C]])reactivemongo.api.commands.CursorFetcher[collection.pack.type,reactivemongo.api.Cursor] <and>
  [R, C <: reactivemongo.api.commands.CollectionCommand with reactivemongo.api.commands.CommandWithResult[R]](command: C with reactivemongo.api.commands.CommandWithResult[R])(implicit writer: collection.pack.Writer[reactivemongo.api.commands.ResolvedCollectionCommand[C]], implicit reader: collection.pack.Reader[R], implicit ec: scala.concurrent.ExecutionContext)scala.concurrent.Future[R]
 cannot be applied to (play.api.libs.json.JsObject)
  thingsJSONCollection.map(collection => collection.runCommand(commandDocument))
                                                    ^

Could someone help me find the way to execute raw commands in a MongoDB collection from Play using ReactiveMongo, please?

The documentation about raw command is available online for the BSON serialization. It can be adapted for the JSON serialization.

import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global

import play.api.libs.json.{ JsObject, Json }

import reactivemongo.play.json._
import reactivemongo.api.commands.Command

def rawResult(db: reactivemongo.api.DefaultDB): Future[JsObject] = {
  val commandDoc = Json.obj(
    "aggregate" -> "orders", // we aggregate on collection `orders`
    "pipeline" -> List(
      Json.obj("$match" -> Json.obj("status" -> "A")),
      Json.obj(
        "$group" -> Json.obj(
          "_id" -> "$cust_id",
          "total" -> Json.obj("$sum" -> "$amount"))),
      Json.obj("$sort" -> Json.obj("total" -> -1))
    )
  )
  val runner = Command.run(JSONSerializationPack)

  runner.apply(db, runner.rawCommand(commandDoc)).one[JsObject]
}