How to write a Mongoose model in ES6 / ES2015

Question

I want to write my mongoose model in ES6. Basically replace module.exports and other ES5 things wherever possible. Here is what I have.

import mongoose from 'mongoose'  class Blacklist extends mongoose.Schema {   constructor() {     super({       type: String,       ip: String,       details: String,       reason: String     })   } }  export default mongoose.model('Blacklist', Blacklist) 

I see this error in the console.

if (!('pluralization' in schema.options)) schema.options.pluralization = this.options.pluralization;                                  ^  TypeError: Cannot use 'in' operator to search for 'pluralization' in undefined 

Answer 1

I'm not sure why you're attempting to use ES6 classes in this case. mongoose.Schema is a constructor to create new schemas. When you do

var Blacklist = mongoose.Schema({}); 

you are creating a new schema using that constructor. The constructor is designed so that behaves exactly like

var Blacklist = new mongoose.Schema({}); 

What you're alternative,

class Blacklist extends mongoose.Schema { 

does is create a subclass of the schema class, but you never actually instantiate it anywhere

You'd need to do

export default mongoose.model('Blacklist', new Blacklist()); 

but I wouldn't really recommend it. There's nothing "more ES6y" about what you are doing. The previous code is perfectly reasonable and is the recommended API for Mongoose.