db.query

Map
  .find({
  artistId: Utils.convertToObjectId(user._id)
  })
  .select("nameUrl status mapType created sliders")
  .populate({
    path: 'sliders',
    select: 'name No createdAt works',
    populate: [{
      path: 'works',
      populate: [{
        path: 'WorkIdInfo',
        model: 'Work'
      }, {
      path: 'artistId',
        model: 'User',
        select: 'userBio'
      }]
    }]
  })
  .exec(function(err, _mapdetail) {
    log.debug(_mapdetail);
  })