Mongoose update via promises

app.js

var Mongoose = require('mongoose');
Mongoose.Promise = require('bluebird');
var Asset = require('./Asset.js')(Mongoose);



function createEntry(cb){
  var asset1 = new Asset();
  var asset2 = new Asset();

  asset1.attributes.push({
    _field:{ _id:asset2._id, name:'Hostname' },
    value: 'antiphates.feralhosting.com'
  })
  return asset1.save(function(err){
    if (cb) cb(err, asset1);
    return asset1;
  });
  return asset1;
}




function workingUpdater(id){
  Asset.find( { _id: id } )
      //.populate( { path: 'attributes._field' } )
      //.populate( { path: '_partition' } )
      .then( doc => {
          doc[0].attributes[0].value = 'FOO'

          return doc[0].save(function (err) {
              if (err) throw new Error(err)

              console.log('Updated to:',doc[0])
          })
      })
      .catch( err => { throw new Error(err) })
      .finally( () => {
        console.log('close');
        //Mongoose.connection.close()
      })
}




function run(){
  createEntry(function(err, e){
    workingUpdater(e._id.toString())
  });
}

Asset.js

module.exports = Mongoose => {
    const Schema = Mongoose.Schema

    const assetSchema = new Schema({
        attributes: [{
            _field: {
                type: Schema.Types.ObjectId,
                ref: 'Field',
                required: true
            },
            value: {
                type: Schema.Types.Mixed,
                required: true
            }
        }],
        _partition: {
            type: Schema.Types.ObjectId,
            ref: 'Partition'
        }
    });

    return Mongoose.model( 'Asset', assetSchema )
}