猫鼬填充返回空数组

Question

我正在使用Mongoose，并且在尝试填充子文档时遇到问题。

我在Mongoose中设计了3种模型：客户，联系人和组。 客户拥有多个联系人和组。该群组拥有一些联系人。

这是我的模特：

Account.ts

import Mongoose from "../services/Mongoose";
import {ContactSchema, IContact} from "./Contact";
import {GroupSchema, IGroup} from "./Group";

export interface IAccount extends Mongoose.Document {
  contacts: Mongoose.Types.DocumentArray<IContact>
  groups: Mongoose.Types.DocumentArray<IGroup>
}

export const AccountSchema = new Mongoose.Schema({
  contacts: [ContactSchema],
  groups: [GroupSchema],
});

const Account = Mongoose.model<IAccount>('Account', AccountSchema);
export default Account;

Contact.ts

import Mongoose from "../services/Mongoose";

export interface IContact extends Mongoose.Document {
  lastName: string
  firstName: string
}

export const ContactSchema = new Mongoose.Schema({
  lastName: {type: String, default: ""},
  firstName: {type: String, default: ""},
});

const Contact = Mongoose.model<IContact>('Contact', ContactSchema);
export default Contact;

Group.ts

import Mongoose from "../services/Mongoose";
import {IContact} from "./Contact";
import {Schema} from "mongoose";

export interface IGroup extends Mongoose.Document {
  name: string
  comments: string
  contacts: IContact["_id"][]
}

export const GroupSchema = new Mongoose.Schema({
  name: {type: String},
  comments: {type: String, default: ""},
  contacts: [{type: Schema.Types.ObjectId, ref: "Contact"}]
});

const Group = Mongoose.model<IGroup>('Group', GroupSchema);
export default Group;

我的人口问题

当我要填充Account.Groups.Contacts时会发生此问题。

//With this query, I can see all the contacts' ObjectId in the groups.contacts property.
const account = await Account.findById(res.locals.accountId);

//However, with this one, contacts property in groups is an empty array.
const account = await Account.findById(res.locals.accountId).populate("groups.contacts").exec();

如何正确填充帐户的路径组。联系人？

预先感谢您的贡献。