Tukukkk

I am using ExpressJS and Mongoose. I am trying to add a data on 3rd level array but it seems that it can't be mapped. here is my sample code:

Here is my model schema, where my collection contains Object where it contains an Element array and under it contains SubElement array

"_id" : "5ab1218975819",

"objectName" : "sample",

"elements" : [

    {

        "_id" : "5abkj2348",

        "elementName" : "some text here",

        "subElements" : [

            {

                "This is where I put my desired data"

            }

         ]

    }

 ]

Model

var mongoose = require('mongoose');

var Schema = mongoose.Schema;



var subElementSchema= new Schema({

    subElementName: {type: String, required: true, trim: true},

    subElements: {type: [subElementSchema], default: }

}, {

    versionKey: false

});



var elementSchema= new Schema({

    elementName: {type: String, required: true, trim: true},

    subElements: {type: [subElementSchema], default: }

}, {

    versionKey: false

});



var objectSchema= new Schema({

    project: {type: String, required: true, trim: true, lowercase: true},

    projectName: {type: String, required: true, trim: true},

    objectName: {type: String, required: true},

    elements: {type: [elementSchema], default: },

    createdAt: {type: Date},

    updatedAt: {type: Date}

}, {

    versionKey: false,

    collection: 'objects'

});



exports.SubElement= mongoose.model('SubElement', subElementSchema);

exports.Element= mongoose.model('Element', elementSchema);

exports.Object= mongoose.model('Object', objectSchema);

Controller

This is where the action happens, wherein the request.params contains the id of element where subElement should be inserted. I have tried using object.elements.subElements.push but it's not working. it returns an error of TypeError: Cannot read property 'push' of undefined

exports.createSubElement= function (req, res) {

        var payload = req.body;

        return Endpoint.Object.findOne({ 'elements._id': req.params.elementId}, { 'elements.$': 1}, function (err, object) {

            if (err)

                return res.status(500).send({ message: 'An error occurednMessage: ' + err });

            if (!object)

                return res.status(404).send({ message: 'Element not Found' });

            else {

                var subElement= new Endpoint.SubElement(payload);

                object.elements.subElements.push(subElement);

                object.save(function (err) {

                    if (err)

                        return res.status(500).send({ message: 'An error occurednMessage: ' + err });

                    return res.status(201).send({ subElement });

                })

            }

        })

    }

Any help will be appreciated. Thanks!