Join two collections using mongoose and get data from both - node.js

Question

I have two collections User and Taxdetails, I want the name and phone number from User and payment details from Taxdetails joingin on user_id in both collections.
I am doing this:
User
.find()
.exec(function(err, userDetails) {
if (err) {
console.log("error in user collection");
res
.status(400)
.json({ 'message':'error','success':false });
} else {
var userid = userDetails.map(function(obj) {
return obj._id;
});
Taxdetail
.find()
.exec({ user_id : { $in : userid } },function(err, requests) {
if(err){
console.log("error in TaxDetails collection");
res
.status(400)
.json({ 'message':'error','success':false });
}else{
console.log("Success, got some data");
res
.status(200)
.json(requests);
}
});
}
});

Answer 1

You may want use referenced schema in your User schema and then populate it like this:
var taxDetailSchema = new Schema({
title: String
});
var taxDetail = mongoose.model('taxDetail', taxDetailSchema);
var userSchema = new Schema({
name: String,
taxDetails: [{ type: Schema.Types.ObjectId, ref: 'taxDetail' }]
});
Your query would look like this:
User
.find()
.populate('taxDetails')
.exec(function(err, users) {
});
The users should look like this:
[
{
name: 'Some Name',
taxDetails: [
{ title: 'Some Title' },
{ title: 'Some other Title' }
]
}
]
Mongoose documentation here
Hope it helps