Mongoose service not returning Map attribute

[iammatis]

Steps to reproduce

Having a mongoose model with attribute of type Map:

module.exports = app => {
  const modelName = 'users';
  const mongooseClient = app.get('mongooseClient');

  const schema = new mongooseClient.Schema({
    firstName: {type: String},
    lastName: {type: String},
    roles: {
      type: Map,
      of: Boolean
    },
    meta: {type: Object}
  }, {
    timestamps: true,
    strict: false
  });

  return mongooseClient.model(modelName, schema);
};

And Class:

const {Service} = require('feathers-mongoose');

exports.Users = class Users extends Service {}

(Hooks are untouched)

Expected behavior

Attribute roles should be returned as any other attribute.

Actual behavior

Attribute roles is being returned empty ("roles": {}), but logging context in after create hook shows roles being there (as a Map)

Module versions

{
  "@feathersjs/authentication": "^4.5.11",
  "@feathersjs/authentication-local": "^4.5.11",
  "@feathersjs/authentication-oauth": "^4.5.11",
  "@feathersjs/configuration": "^4.5.11",
  "@feathersjs/errors": "^4.5.11",
  "@feathersjs/express": "^4.5.11",
  "@feathersjs/feathers": "^4.5.11",
  "@feathersjs/socketio": "^4.5.11",
  "@feathersjs/transport-commons": "^4.5.11",
  "feathers-mongoose": "^8.3.1",
  "mongoose": "^5.11.17"
}

NodeJS version:
node:14.15.3

Issue duplicated from feathersjs-ecosystem/feathers-mongoose#398

[iammatis]

This was a dumb mistake of mine, all I had to add was schema.set('toObject', {flattenMaps: true}); into my model.