Error: BasicDBList cannot be cast to List

[stephanos]

I'm having a little trouble with subselects and can't figure out why. I have a collection of apps, each document has a field 'team' where 'team members' are listed. 

To find a team member via his user id I wrote this:

def findTeamMember(appId: Int, userId: ObjectId): Option[TM] =

    for {

        result <- AppCol.where(_._id eqs appId)

            .scan(_.team.subfield(_.members.subfield(_.user.subfield(_.id))) in List(userId))

            .select(_.team.subselect(_.members)).get()

        members <- result.headOption

        member <- members.headOption

    } yield member

But I keep getting this error:

Caused by: java.lang.ClassCastException: com.mongodb.BasicDBList cannot be cast to scala.collection.immutable.List

at com.mycompany.TeamReader$$anonfun$findTeamMember$9$$anonfun$apply$14.apply(TeamReaderComp.scala:62) 

at scala.Option.flatMap(Option.scala:146) 

at com.mycompany.TeamReader$$anonfun$findTeamMember$9.apply(TeamReaderComp.scala:62)

at com.mycompany.TeamReader$$anonfun$findTeamMember$9.apply(TeamReaderComp.scala:58) 

at scala.Option.flatMap(Option.scala:146)

at com.mycompany.TeamReader.findTeamMember(TeamReaderComp.scala:58) 

What could I do about it?

[stephanos]

Hm, when I use

  AppCol

    .where(_._id eqs sourceId)

    .scan(_.team.subfield(_.members.subfield(_.user.subfield(_.id))) in List(userId))

    .select(_.team.subfield(_.members))

    .get().headOption.getOrElse(Empty).getOrElse(List()).headOption

it says

  java.lang.ClassCastException: com.mongodb.BasicDBList cannot be cast to scala.collection.TraversableLike

[Jason Liszka]

Hm, not sure without looking at how your models are declared, in particular the types of all the fields involved. Could you send that over?

[stephanos]

I will send you the relevant code in a private mail.

On Wednesday, June 13, 2012 6:09:07 PM UTC+2, Jason Liszka wrote:

Hm, not sure without looking at how your models are declared, in particular the types of all the fields involved. Could you send that over?