The `id` field is missing when assigning a type to the Model.

[xiejay97]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

9.0.1

Node.js version

22.18.0

MongoDB server version

8.2.2

Typescript version (if applicable)

5.9.3

Description

When I upgraded to the latest version, I found that the TypeScript checks failed because the document was missing the id field.

Steps to Reproduce

import { Schema, model, connect } from 'mongoose';

// 1. Create an interface representing a document in MongoDB.
interface IUser {
  name: string;
  email: string;
  avatar?: string;
}

// 2. Create a Schema corresponding to the document interface.
const userSchema = new Schema<IUser>({
  name: { type: String, required: true },
  email: { type: String, required: true },
  avatar: String
});

// 3. Create a Model.
const User = model<IUser>('User', userSchema);

run().catch(err => console.log(err));

async function run() {
  // 4. Connect to MongoDB
  await connect('mongodb://127.0.0.1:27017/test');

  const user = new User({
    name: 'Bill',
    email: 'bill@initech.com',
    avatar: 'https://i.imgur.com/dM7Thhn.png'
  });
  await user.save();

  // Property 'id' does not exist on type 'Document<unknown, {}, IUser, {}, DefaultSchemaOptions> & IUser & { _id: ObjectId; } & { __v: number; }'.ts(2339)
  console.log(user.id);
}

Expected Behavior

No response

[vkarpov15]

@david-loe Mongoose documents have a id getter by default, which returns the string form of _id.

@xiejay97 we're working on a fix, but easiest workaround is to rely on Mongoose's automatic type inference - just delete IUser

import { Schema, model, connect } from 'mongoose';

// 1. Create a Schema corresponding to the document interface.
const userSchema = new Schema({
  name: { type: String, required: true },
  email: { type: String, required: true },
  avatar: String
});

// 2. Create a Model.
const User = model('User', userSchema);

run().catch(err => console.log(err));

async function run() {
  // 4. Connect to MongoDB
  await connect('mongodb://127.0.0.1:27017/test');

  const user = new User({
    name: 'Bill',
    email: 'bill@initech.com',
    avatar: 'https://i.imgur.com/dM7Thhn.png'
  });
  await user.save();

  console.log(user.id);
}