Allow users to add items to their profiles Mongoose - angularjs

Question

I am building a mean stack app with express and mongoose. I have two schemas, userSchema and courseSchema:
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var courseSchema = mongoose.Schema({
title:{type:String, required:'{PATH} is required!'},
featured:{type:Boolean, required:'{PATH} is required!'},
published:{type:Date, required:'{PATH} is required!'},
courseLink:{type:String, required:'{PATH} is required!'},
user: [{type:Schema.Types.ObjectId, ref : 'User'}]
});
var Course = mongoose.model('Course', courseSchema);
module.exports = Course;
var userSchema = mongoose.Schema({
firstName: {type: String, required: true},
lastName: {type: String, required: true},
username: {
type: String,
required: true,
unique: true // creates unique index inside MongoDB
},
salt: {type: String, required: true},
hashed_pwd: {type: String, required: true},
roles:[String],
courses:[{type: Schema.ObjectId,
ref: 'Course' }]
});
I am able to create users and and courses (as an admin). What I want to do now is to allow each user add a course to his list of courses (or just click a 'like' button beside the course and that course would be added to his profile).
On the side of the controller, I have tried to check for the user id from the session, find that user and add the course to his document. But that's where I am stuck,
exports.addMyCourse = function(req, res){
console.log('user id', req.session.passport.user);
console.log('id', req.body._id);
var currentUserId = req.session.passport.user;
User.findOne({'_id':currentUserId}, function(err, doc){
console.log(doc);
});
Most of the solutions I looked at are not very clear about this. Any help would be appreciated.

Answer 1

RESOLVED:
I used $addToSet to add the course objects into the courses array inside the User model:
This might be useful for people searching for similar soutions:
My User schema:
var userSchema = mongoose.Schema({
firstName: {type: String, required: true},
lastName: {type: String, required: true},
username: {
type: String,
required: true,
unique: true // creates unique index inside MongoDB
},
salt: {type: String, required: true},
hashed_pwd: {type: String, required: true},
roles:[String],
courses:[{
type:Schema.ObjectId, ref:'Course'
}]
});
var User = mongoose.model('User', userSchema);
My Course schema:
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var courseSchema = mongoose.Schema({
title:{type:String, required:'{PATH} is required!'},
featured:{type:Boolean, required:'{PATH} is required!'},
published:{type:Date, required:'{PATH} is required!'},
courseLink:{type:String, required:'{PATH} is required!'}
});
var Course = mongoose.model('Course', courseSchema);
Inside my controllers folder, I have users.js and courses.js:
In the courses.js file, I created the addMyCourses middleware to update the User model's courses array by first retrieving the current user's id from the session and using $addToSet to insert the object and avoid duplicates at the same time. Also I made sure I am adding only the ObjectId's of the courses and not the entire course document so I won't have future problems with too much data in one document:
exports.addMyCourse = function(req, res){
var myCourse = {
title: req.body.title,
featured: req.body.featured,
published: req.body.published,
courseLink: req.body.courseLink
};
var currentUserId = req.session.passport.user;
var courseId = req.body._id;
User.update({_id:currentUserId},
{$addToSet: {"courses": courseId}},
{safe: true, upsert: true, new : true},
function(err, model) {
console.log(model);
}
);
};
Since I only had the ObjectId's of the courses inside the courses array of the User model, I had to use mongoose's populate() method to do a joint query on both models so that I get the corresponding course documents of the ids.
In users.js file:
exports.getUserCourses = function(req, res, next){
var currentUserId = req.session.passport.user;
User.findById(currentUserId).populate('courses')
.exec(function(err, data){
if(err) {
console.log(err);
}
console.log('user courses', data);
res.send(data);
})
};