Mongoose typings, id property not available - node.js

Question

I used the following code for my mongoose TypeScript model.
import mongoose = require('mongoose')
export interface PieceInterface extends mongoose.Document {
date: Date
summary: string
source: string
link: string
}
export const PieceSchema = new mongoose.Schema({
date: { type: Date, default: new Date(), required: true },
summary: { type: String, default: 'summary', required: true },
source: { type: String, default: 'source', required: true },
link: { type: String, default: '#', required: true }
})
export const Piece = mongoose.model<PieceInterface>('Piece', PieceSchema)
Now, when I use Piece.find({}).then(x => {...}), x is a Promise<PieceInterface[]> as expected.
However, I am not able to get
Piece.find({}).then(x => {
console.log(x[0].id)
})
to compile properly, it always tells me error TS2339: Property 'id' does not exist on type 'PieceInterface'.
Since, PieceInterface extends mongoose.Document, I looked...
interface Document extends MongooseDocument, NodeJS.EventEmitter, ModelProperties
And then,
class MongooseDocument implements MongooseDocumentOptionals
And finally this,
interface MongooseDocumentOptionals {
id?: string;
}
And in my mind, it should work. I am able to use variables provided by MongooseDocument and ModelProperties, but not MongooseDocumentOptionals.
Anything I'm missing?
References: mongoose.d.ts from GitHub
Definition of document
Definition of MongooseDocument
Definition of MongooseDocumentOptionals

Answer 1

Default field name for the ID in Mongo is _id not id, so you should do:
Piece.find({}).then(x => {
console.log(x[0]._id)
})

Answer 2

my friend,
Use this mechanism,
import mongoose = require('mongoose')
export interface PieceInterface extends mongoose.Document {
id : mongoose.Types.ObjectId //Add this line
date: Date
summary: string
source: string
link: string
}
export const PieceSchema = new mongoose.Schema({
date: { type: Date, default: new Date(), required: true },
summary: { type: String, default: 'summary', required: true },
source: { type: String, default: 'source', required: true },
link: { type: String, default: '#', required: true }
})
export const Piece = mongoose.model<PieceInterface>('Piece', PieceSchema)