Populate data from another collection mongoose - node.js

Question

I have 3 collections users, profiles and trustedcontacts. Profiles and trustedcontacts have ref to users
My db collections
I have collection users
{
"_id": {
"$oid": "5c5ecaf6134fc342d4b1a9d5"
},
"name": "User",
"email": "user#gmail.com",
"password": "$2a$10$BXxwpMTFK1a0aWclaqJYve4f3SZyi/emwHKv5rY2GNzrPSEsIJhzi",
},
{
"_id": {
"$oid": "5c64968cae53a8202c963223"
},
"name": "User1",
"email": "user1#gmail.com",
"password": "$2a$10$BXxwpMTFK1a0aWclaqJYve4f3SZyi/emwHKv5rY2GNzrPSEsIJhzi",
},
{
"_id": {
"$oid": "5c69968cae53a8202c963554"
},
"name": "User1",
"email": "user1#gmail.com",
"password": "$2a$10$BXxwpMTFK1a0aWclaqJYve4f3SZyi/emwHKv5rY2GNzrPSEsIJhzi",
}
collection profiles
{
"_id": {
"$oid": "5c5ecb17134fc342d4b1a9d6"
},
"user": {
"$oid": "5c5ecaf6134fc342d4b1a9d5"
},
"handle": "handle",
"company": "test"
},
{
"_id": {
"$oid": "5c6496ebae53a8202c963224"
},
"user": {
"$oid": "5c64968cae53a8202c963223"
},
"handle": "handle1",
"company": ""
},
{
"_id": {
"$oid": "5c6496ebae53a8202c963224"
},
"user": {
"$oid": "5c69968cae53a8202c963554"
},
"handle": "handle2",
"company": ""
}
collection trustedcontacts
{
"_id": {
"$oid": "5d76008e4b98e63e58cb34cc"
},
"approvedTrustedContacts": [
{
"_id": {
"$oid": "5d764e411b7476462cf6b540"
},
"user": {
"$oid": "5c5ecaf6134fc342d4b1a9d5"
}
},
{
"_id": {
"$oid": "5d764e411b7476462cf6b541"
},
"user": {
"$oid": "5c64968cae53a8202c963223"
}
}
],
"pendingApprovalContacts": [],
"waitingForApprovalContacts": [],
"user": {
"$oid": "5d76008e4b98e63e58cb34cb"
}
}
//My Schemas
const UserSchema = new mongoose.Schema({
name: {
type: String,
},
email: {
type: String,
}
});
export default mongoose.model('User', UserSchema);
const ProfileSchema = new mongoose.Schema({
user: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
handle: {
type: String,
},
company: {
type: String,
},
});
export default mongoose.model('Profile', ProfileSchema);
import mongoose from 'mongoose';
const TrustedContactsSchema = new mongoose.Schema({
user: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
},
approvedTrustedContacts: [
{
user: {
type: mongoose.Schema.Types.ObjectId,
ref: 'User'
}
}
],
...
});
export default mongoose.model('TrustedContacts', TrustedContactsSchema);
I can populate trusted contact by user
const user = await TrustedContacts.findOne({ user: req.user.id }).populate('approvedTrustedContacts.user', ['name', 'email']);
and I got
"user": {
"date": "2019-09-09T07:32:20.174Z",
"_id": "5d76008e4b98e63e58cb34cc",
"approvedTrustedContacts": [
{
"_id": "5d764e411b7476462cf6b540",
"user": {
"_id": "5c5ecaf6134fc342d4b1a9d5",
"name": "User",
"email": "user#gmail.com",
}
},
{
"_id": "5d764e411b7476462cf6b541",
"user": {
"_id": "5c64968cae53a8202c963223",
"name": "User1",
"email": "user1#gmail.com",
}
}
],
"pendingApprovalContacts": [],
"waitingForApprovalContacts": [],
"user": "5d76008e4b98e63e58cb34cb",
}
Expected Output
It is possible to get list of approvedTrustedContacts with profile data
"approvedTrustedContacts": [
{
"_id": "5d764e411b7476462cf6b540",
"user": {
"_id": "5c5ecaf6134fc342d4b1a9d5",
"name": "User",
"email": "user#gmail.com",
},
"handle": "handle",
"company": "test"
},
{
"_id": "5d764e411b7476462cf6b541",
"user": {
"_id": "5c64968cae53a8202c963223",
"name": "User1",
"email": "user1#gmail.com",
},
"handle": "handle1",
"company": "test1"
}
],
Also I have joined 2 collections like this
let result1 = await TrustedContacts.aggregate([
{ $lookup: { from: "profiles", localField: "user", foreignField: "user", as: "approvedTrustedContacts" } },
]);
And I got
{
"_id": "5d76008e4b98e63e58cb34cc",
"approvedTrustedContacts": [
{
"_id": "5d764f551b7476462cf6b542",
"user": "5d76008e4b98e63e58cb34cb",
"handle": "handle",
"company": "test",
},
{
"_id": "5c5ecb17134fc342d4b1a9d6",
"user": "5c5ecaf6134fc342d4b1a9d5",
"handle": "handle1",
"company": "test1",
}
],
"pendingApprovalContacts": [],
"waitingForApprovalContacts": [],
"user": "5d76008e4b98e63e58cb34cb",
}
],
Now I don't know how to polute user to have an output like this:
{
"_id": "5d76008e4b98e63e58cb34cc",
"approvedTrustedContacts": [
{
"_id": "5d764f551b7476462cf6b542",
"user": {
"_id": "5c5ecaf6134fc342d4b1a9d5",
"name": "User",
"email": "user#gmail.com",
},
"handle": "handle"
"company": "test",
},
{
"_id": "5c5ecb17134fc342d4b1a9d6",
"user": {
"_id": "5c64968cae53a8202c963223",
"name": "User1",
"email": "user1#gmail.com",
},
"handle": "handle1",
"company": "test1",
}
],
"pendingApprovalContacts": [],
"waitingForApprovalContacts": [],
"user": "5d76008e4b98e63e58cb34cb",
}
],

Answer 1

My solution
let result = await TrustedContacts.aggregate([
{ $lookup: { from: "profiles", localField: "approvedTrustedContacts.user", foreignField: "user", as: "approvedTrustedContacts.profile" } },
{ $unwind: "$approvedTrustedContacts.profile" },
{ $lookup: { from: "users", localField: "approvedTrustedContacts.profile.user", foreignField: "_id", as: "approvedTrustedContacts.profile.user" } },
{ $unwind: "$approvedTrustedContacts.profile.user" },
{ $group :{
_id: "$_id",
"date": {"$first": "$date"},
"approvedTrustedContacts": {"$push": "$approvedTrustedContacts"},
}}
]);
As an output I have
{
"_id": "5d76008e4b98e63e58cb34cc",
"date": "2019-09-09T07:32:20.174Z",
"approvedTrustedContacts": [
{
"profile": {
"_id": "5c5ecb17134fc342d4b1a9d6",
"skills": [
"test"
],
"date": "2019-02-09T12:42:48.969Z",
"user": {
"_id": "5c5ecaf6134fc342d4b1a9d5",
"data": "2019-02-09T12:42:48.716Z",
"name": "User",
"email": "user#gmail.com",
},
"handle": "handle",
"company": "test",
}
},
{
"profile": {
"_id": "5c6496ebae53a8202c963224",
"skills": [
"qwqwqwqwqw"
],
"date": "2019-02-13T22:11:04.119Z",
"user": {
"_id": "5c64968cae53a8202c963223",
"data": "2019-02-13T22:11:03.807Z",
"name": "User1",
"email": "user1#gmail.com",
},
"handle": "handle1",
"company": "test1",
}
}
]
}
```