meanjs controller for subdocument - node.js

Question

I have architectural question about how to design my meanjs controller and routes for mongoose subdocuments.
my model looks as following:
'use strict';
/**
* Module dependencies.
*/
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
/**
* Customerrpc Schema
*/
var CustomerrcpSchema = new Schema({
company: {
type: String,
enum: ['Option1', 'Option2'],
required: 'Please fill company name'
},
rcp: {
type: String,
required: 'Please fill rcp'
},
created: {
type: Date,
default: Date.now
},
user: {
type: Schema.ObjectId,
ref: 'User'
}
});
/**
* Customer Schema
*/
var CustomerSchema = new Schema({
name: {
type: String,
default: '',
required: 'Please fill Customer name',
trim: true
},
description: {
type: String,
default: '',
//required: 'Please fill Customer description',
trim: true
},
url: {
type: String,
default: '',
//required: 'Please fill Customer url',
trim: true
},
rcp: [CustomerrcpSchema],
created: {
type: Date,
default: Date.now
},
user: {
type: Schema.ObjectId,
ref: 'User'
}
});
mongoose.model('Customer', CustomerSchema);
mongoose.model('Customerrcp', CustomerrcpSchema);
I tried it out by adding on the server controller the following code during the create methode:
exports.create = function(req, res) {
var customer = new Customer(req.body);
customer.user = req.user;
var rcp = new Customerrcp({
company: 'Option1',
rcp: 'dumm',
user: req.user
});
customer.rcp = rcp;
customer.save(function(err) {
if (err) {
return res.status(400).send({
message: errorHandler.getErrorMessage(err)
});
} else {
res.jsonp(customer);
}
});
};
This works perfectly fine. Now my question is what is the best procedure to create / modify / remove a subdocument from the maindocument?
I thought of always work with the main document 'Customer' but this brings several issues with it that i dont like, like saving always the hole document. Since i do have a uniq _id for each subdocument i guess there must be a better way.
What i would like to have is a controller only for the subdocument with the create / save / remove statement for it. Is this even possible?
As far as i understand it:
to create a new subdocument i need the following: _id of the main document for the mongoose query. So i need a service which would handover the _id of the maindocument to the controller of the selected subdocument. I was able to do this.
But im insecure if this is the proper way.
Any Ideas?
Cheers,
Michael