error

error: value where is not a member of BaseMeta[_] with BaseDoc[_]
doc.where(_._id eqs 42)

Rogue.scala

import com.foursquare.rogue.LiftRogue._
import net.liftweb.mongodb.record.{MongoRecord, MongoMetaRecord}

// ==== BASE

trait BaseDoc[T <: MongoRecord[T]]
  extends MongoRecord[T] {

  self: T =>

  object id
}

trait BaseMeta[T <: BaseDoc[T]]
  extends MongoMetaRecord[T] {

  self: T =>
}

// ==== DOC #1

class BaseDoc1 extends BaseDoc[BaseDoc1] {
  def meta = BaseMeta1
}
object BaseMeta1 extends BaseDoc1 with BaseMeta[BaseDoc1]

// ==== DOC #2

class BaseDoc2 extends BaseDoc[BaseDoc2] {
  def meta = BaseMeta2
}
object BaseMeta2 extends BaseDoc2 with BaseMeta[BaseDoc2]

// ==== QUERY

case class Mod(num: Int) {
  def doc: BaseMeta[_] with BaseDoc[_] = // WRONG
    num % 2 match {
      case 0 => BaseMeta1
      case _ => BaseMeta2
    }
}

object Main {

  val doc = Mod(0).doc
  doc.where(_._id eqs 42)
}