Question 116810 in Mongodb Question posted in
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Mongodb – Mongoose Populate response returns null

I have a database in MongoDB with two collections: Users and Contacts. In my project I have two models: User and Contact. Every User has an array with his contacts and every contact has a property owner that stores the id of the user that contains that contact. These are my models:

export const contactSchema = new Schema({
  phoneNumber: {
    type: String,
    required: true,
  },
  owner: {
    type: Schema.Types.ObjectId,
    ref: "User",
  },
});

const Contact = model("Contact", contactSchema, "contacts");


const userSchema = new Schema({
  phoneNumber: {
    type: String,
    required: true,
    unique: true,
  },
  password: {
    type: String,
    required: true,
  },
  contacts: [{ type: Schema.Types.ObjectId, ref: "Contact" }],
});

const User = model("User", userSchema, "users");

export default User;

Now, I’m trying to make a function that receives a request, response and next function and returns in the response an array with all the contacts of the user id ‘631791f8d7342693105b6908’:

import { NextFunction, Request, Response } from "express";
import Contact from "../../../database/models/Contact/Contact";

const getContacts = async (req: Request, res: Response, next: NextFunction) => {
    const contacts = await Contact.findOne({
      _id: "631791f8d7342693105b6908",
    }).populate("owner");

    res.status(200).json({ contacts });
};

export default getContacts;

In my mongoDB I have a contact that contains the owner with that id, but when I make the request the response is:

{
  "contacts": null
}

How can I make for get in the response the contact that has as owner the id porvided before?

If anyone can help me I would be very grateful. Thanks!

Tags:

2

Answers


  1. 0

    The null suggests that the query yields no results at all (which is unrelated to .populate()).

    From what you’re describing, you want to search for contacts where the owner matches a particular id, so the query should be:

    const contacts = await Contact.findOne({
  owner: "631791f8d7342693105b6908",
}).populate("owner");

    As you state in your comment, use .find() if you want to find all contacts belonging to a particular owner.

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  2. 0 
    try this

    const contacts = await Contact.findOne({
  owner: new ObjectId("631791f8d7342693105b6908"),
}).populate("owner");
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