how to store bunyan log stream into mongoose

bunyan-mongoose.js

const bunyan = require('bunyan')
const mongoose = require('mongoose')
const Schema = mongoose.Schema;

const Log = mongoose.model('Log', new Schema({
  name: String,
  hostname: String,
  pid: Number,
  level: Number,
  msg: String,
  time: { type: Date, index: true },
  v: Number,
}, {
  versionKey: 'ver',
}));

const MongooseLogStream = class {
  write(rec) {
    try { new Log(JSON.parse(rec)).save() }
    catch(e) { console.error(e) }
  }
}

const log = bunyan.createLogger({
  name: "my log store",
  streams: [{stream: new MongooseLogStream()}]
})