Error constructing as per schema - mongodb

Question

I have the following defined in my server.js,
//server.js
var mongoose = require("mongoose");
var Schema = mongoose.Schema;
var userSchema = new Schema({
"userName": {
type: String,
unique: true
},
"password": String,
"loginHistory": [{
"userAgent": String,
"dateTime": Date
}]
});
var User;
module.exports.initialize = () => {
return new Promise(function (resolve, reject) {
let db = mongoose.createConnection("mongodb://<dbuser>:<dbpassword>#ds237409.mlab.com:37409/web322_a6");
db.on('error', (err)=>{
reject(err); // reject the promise with the provided error
});
db.once('open', () => {
User = db.model("users", userSchema);
resolve();
});
})
};
I have a function that is called when posting to my app.post('/register') route, and it basically builds a new User, then assigns it to the passed data, and resolves it afterwards.
module.exports.registerUser = (userData) => {
return new Promise((resolve, reject) => {
if (userData.password != userData.password2) {
reject("Passwords do not match!");
}
let newUser = new User(userData);//<!-- 'Error: TypeError: User is not a constructor'
newUser.save((err) => {
if(err.code == 11000) {
reject("Username already taken");
} else {
reject("Error creating User: " + err);
}
// exit the program after saving
//process.exit();
resolve();
});
})
}
At first I thought I've misdefined User, but I seem to have initialized it properly, as per the MongoDB documentation. Any thoughts? It keeps throwing Error: TypeError: User is not a constructor
EDIT: /post / register
app.post("/register", (req, res) => {
console.log("entering1");
dataServiceAuth.registerUser(req.body).then((data) => {
res.render('register', {successMessage: "User Created"});
}).catch((err) => {
console.log("Error: " + err);
res.render('register', {errorMessage: err, userName: req.body.userName});
})
});

Answer 1

My error was in,
let db = mongoose.createConnection("mongodb://<dbuser>:<dbpassword>#ds237409.mlab.com:37409/web322_a6");
The greater than and less than signs are not to be used. Proper string:
let db = mongoose.createConnection("mongodb://dbuser:dbpassword#ds237409.mlab.com:37409/web322_a6");