Mongoose Discriminators unable to add dicriminator details - node.js

Question

Im currently working on adding discriminators to my express rest api. I have added different types of users to the user schema using the discriminators as different user require additional information. The problem I am facing is that when I post to the api get no errors when adding the information and only the general information is added to the schema, the details within the discriminators are ignored.
The schema is as follows:
var options = { discriminatorKey: 'type' };
var UserSchema = new Schema({
local: {
email: {
type: String,
sparse: true,
lowercase: true,
},
password: { type: String },
},
facebook: {
id: String,
token: String,
email: String,
name: String,
profileIMG: String,
},
twitter: {
id: String,
token: String,
displayName: String,
username: String
},
google: {
id: String,
token: String,
email: String,
name: String,
profileIMG: String,
}
}, options);
var addressSubschema = {
street: {
type: String,
required: true
},
number: {
type: String,
required: true
},
city: {
type: String,
required: true
},
};
var workingHoursSchema = {
start: {
type: String,
required: true
},
finish: {
type: String,
required: true
}
};
var adminSchema = new Schema({
description: {
type: String,
required: true
},
category: {
type: String,
required: true
},
workingHours: workingHoursSchema,
address: addressSubschema,
workingRadius: {
type: Number,
required: true
},
}, options);
var User = mongoose.model('User', UserSchema);
var Admin = User.discriminator('AdminUser', adminSchema);
module.exports = User;
I then export the model and when saving a new user I get a success however the admin details are not saved.
User.findOne({'local.email': email}, function(err, existingUser) {
if (err) { return next(err) }
if (existingUser) {return res.status(422).json({error: "Email already exists"})}
var user = new User({
"local.email": req.body.email,
"local.password": req.body.password,
"description": req.body.description,
"category": req.body.category,
"workingRadius": req.body.workingRadius,
"street": req.body.street,
"number": req.body.number,
"city": req.body.city,
"start": req.body.start,
"finish": req.body.finish
});
user.save(function(err) {
if (err) { return next(err) }
res.json({success: true});
});
});
Im new to using the discriminator so any help is greatly appreciated.