Express: Embed document in the existing document - node.js

Question

I am developing an application in Express, Node and Mongo being the database. I have a collection users, and user can have mutiple registered-IDs. It like a one-to-many relationship. I m trying to embed a document in the user collection like this:
post(function (req, res, next) {
var pid=req.body.pid;
var sid=req.body.sid;
var rfname=req.body.rfname;
var des=req.body.des;
var brand=req.body.brand;
var model=req.body.model;
var serial=req.body.serial;
var location=req.body.location;
var arr={pid: 'pid', sid: 'sid', rfname: 'rfname' ,des: 'des', brand: 'brand', model: 'model' ,serial: 'serial', location: 'location'};
mongoose.model('User').findOne({'pemail': req.session.email}, function (err, user){
if(err){
} else {
user.registeredId = arr;
user.save(function(err){
if(err){
} else {
res.render('user/register', {'success': 'dfhlaksdhfh'});
}
})
}
});
}
My user schema is like this:
var mongoose = require('mongoose');
var userSchema = new mongoose.Schema({
email: String,
password: String,
fname: String,
lname: String,
plang: String,
slang: String,
country: String,
state: String,
city: String,
postalcode: String,
address1: String,
address2: String,
pemail: String,
semail: String,
age: String,
gender: String,
pphone: String,
sphone: String,
q1: String,
a1: String,
q2: String,
a2: String,
cfname: String,
clname: String,
cemail: String
});
mongoose.model('User', userSchema);
Guide me, what am i doing wrong, because it does not embed document in the existing document. Do I need to define that in schema, if so, then how?

Answer 1

In your schema definition, the field registeredId is not defined and by default through the strict option, Mongoose ensures that values passed to your model constructor that were not specified in our schema do not get saved to the db, hence it is not creating the modified document.
You can either explicitly define the field in your schema or set the strict option to false in your schema definition:
// set to false..
var userSchema = new Schema({..}, { strict: false });
and then implement one of the findAndModify() methods like findOneAndUpdate() to update your user document by pushing the new object to the new array field registeredId. So you could re-write your post function as:
post(function (req, res, next) {
var User = mongoose.model('User'),
pid=req.body.pid,
sid=req.body.sid,
rfname=req.body.rfname,
des=req.body.des,
brand=req.body.brand,
model=req.body.model,
serial=req.body.serial,
location=req.body.location,
arr = {
'pid': pid,
'sid': sid,
'rfname': rfname,
'des': des,
'brand': brand,
'model': model,
'serial': serial,
'location': location
},
condition = { 'pemail': req.session.email },
update = {
"$push": { 'registeredId': arr }
};
User.findOneAndUpdate(
condition,
update,
function (err, doc){
if(err){}
else {
// doc contains the modified document
res.render('user/register', {'success': 'dfhlaksdhfh'});
}
}
);
});