find subdocument without start from parent - express

Question

Pretty new to mongoose. Can I findOne off of a subdocument model?
I have a subdoc called deliverables which is a child of projects
What I'd like to do is FIND on my deliverables model so I don't have to find on the project as
{project.child.child.child.deliverables._id: req.id}
Is that possible or do I have to start from the project model each time? Below is a sample setup I'm using along with my example findOne.
'use strict';
//////////////model/////////////////
var mongoose = require('mongoose'),
Schema = mongoose.Schema;
var deliverablesSchema = new Schema({
title:{
type:String,
}
})
var ProjectSchema = new Schema({
name: {
type: String,
},
deliverables: [deliverablesSchema],
});
mongoose.model('Deliverable', deliverablesSchema);
mongoose.model('Project', ProjectSchema);
//////////////controller/////////////////
var mongoose = require('mongoose'),
Project = mongoose.model('Project'),
Deliverable = mongoose.model('Deliverable'),
_ = require('lodash');
exports.findDeliverable = function(req, res) {
Deliverable.findOne({'_id': req.params.deliverableId}).exec(function(err, deliverable) {
if(deliverable){
//return
}
});
};

Answer 1

You can find subdocuments within a document only if you have declared their schema http://mongoosejs.com/docs/subdocs.html
Here is an example taken from here:
Project.findOne({
'_id': myid
}).exec(function (err, p) {
if (p) {
//return
var deriv = p.deliverables.filter(function (oneP) {
return oneP._id === 'myderivableid';
}).pop();
}
});
If your subdocuments are just nested objects in an array you may use Lodash to retrieve that data using _ .where or _.find

Answer 2

Kept digging and found this:
https://stackoverflow.com/a/28952991/2453687
You still have to pull the master document first but it's easy to drill down to the particular object you're looking for and make a quick update, then just update the whole master document in one shot.
Dead simple. Works like a charm.