How to add elements into array that can contain two different schema and populate it in MongoDB?

Working with Data Node.js Frameworks
,
1

I want to add elements in an array that can contain two different schemas and populate it.

Problem: populate() return an array of ids.

This is what I tried:

const mongoose = require('mongoose');
const { ObjectId } = mongoose.Schema.Types;

const cardSchema = new mongoose.Schema(
  {
    name: { type: String, required: true },
    localDevice: [
      {
        type: ObjectId,
        required: true,
        refPath: 'onModel'
      }
    ],
    onModel: {
      type: ObjectId,
      enum: ['location', 'device']
    }
  },
  { timestamps: true }
);

const cardModel = mongoose.model('card', cardSchema);
module.exports = cardModel;

Insert a new card:

const newCard = new cardModel({
    name: "Card 1",
    localDevice: ["115b2fe8b7bb5d3d49078a12", "115c1c6fd363f41494e6a714"]
  });
  await newCard.save();

Populate:

 const cards = await cardModel
       .find({ userId: mongoose.Types.ObjectId(userId) })
       .select({
            _id: 1,
            name: 1,
            localDevice: 1
          })
       .populate({ path: 'localDevice' });

type or paste code here