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'use strict';const mongoose = require('mongoose');const Schema = mongoose.Schema;
console.log('Running mongoose version %s', mongoose.version);
/** * Schema */
const CharacterSchema = Schema({  name: {    type: String,    required: true  },  health: {    type: Number,    min: 0,    max: 100  }});
/** * Methods */
CharacterSchema.methods.attack = function() {  console.log('%s is attacking', this.name);};
/** * Character model */
const Character = mongoose.model('Character', CharacterSchema);
/** * Connect to the database on localhost with * the default port (27017) */
const dbname = 'mongoose-example-doc-methods-' + ((Math.random() * 10000) | 0);const uri = 'mongodb://localhost/' + dbname;
console.log('connecting to %s', uri);
mongoose.connect(uri, function(err) {  // if we failed to connect, abort  if (err) throw err;
  // we connected ok  example();});
/** * Use case */
function example() {  Character.create({ name: 'Link', health: 100 }, function(err, link) {    if (err) return done(err);    console.log('found', link);    link.attack(); // 'Link is attacking'    done();  });}
/** * Clean up */
function done(err) {  if (err) console.error(err);  mongoose.connection.db.dropDatabase(function() {    mongoose.disconnect();  });}