How to update document in mongo with nested schema - node.js

Question

I have the following code:
add_new_patient : function(username,pname,pid,pdesc,callback){
var find_md = function(){
return function(err,pat){
if (err){
console.log('Error at adding patient: error at searching for users');
callback(2);//In the callback method I'm passing I have specific behavior for error handling for error codes.
return;
}
if (pat.lenth > 0){
console.log('searching for md');
MD.find({'mdname':username},add_patient(pat));
}else{
console.log('Error at adding patient: no user found');
callback(-1);
return;
}
}}
var add_patient = function(pat){
return function(err,md){
if (err){
console.log('Error at adding patient: cannot find md');
callback(-1);
return;
}
callback(0);
}
}
console.log('searching for user '+pid);
User.find({'name':pid},find_md());
}
And these are my schemas:
var mdSchema = mongoose.Schema({
mdname : String,
pacients : [userSchema.ObjectId]
});
var userSchema =mongoose.Schema({
name : String,
password : String,
phone : String,
history : [{timestamp: Date , heart: Number }],
md : {mdname: String, contact: Number}
});
As you can guess from the code I want to add patients to the dms. First I search for the pid in the database. If I find a patient I start to look for mds. When I find the md I want to add the patient to the md. Now I don't know how to add them. The schema shows that I have an array of schemaUser, which is the type of patient, but I don't know how to append to it, not how to create an MD model from object from the data I received from the query. Also what should I insert into the array of patients? The _id of the found patient or the whole object?

Answer 1

I managed to solve it in the following way:
var add_patient = function(pat){
return function(err,md){
if (err){
console.log('Error at adding patient: cannot find md');
callback(-1);
return;
}
var query = {mdname: md.mdname};
console.log(md);
var doThis = { $addToSet: { patients: pat._id } };
console.log(query);
MD.update(query,doThis,done_adding());
}
}
var done_adding = function(){
return function(err,dat){
if (err){
console.log('Error at the end of adding new patient!');
callback(-1);
return;
}
console.log('new patient added');
callback(0);
}
So what this does is: when I have the md to whom I want to add a patient/user I use the update method, with the $addToSet operation so I will have a set of patients associated with an md. I don't know why, but the same code did not work for me with the $push parameter. Then simply nothing happened and when I set the upsert option to true my whole record in the database was overwritten by the id.