Append/Add Objects without creating a new Parent in Mongoose - node.js

Question

My Schema be like as follows
var DeptSchema = new Schema({
name : {type : String, default: ''},
sku : {type : String, default: ''}, // (SKU = stock keeping unit)
Product : {
name : {type : String, default: '', unique:true},
sku : {type : String, default: '', unique:true}, // (SKU = stock keeping unit)
description : {type : String, default: '100gm'},
price : {type : String, default: ''},
quantity : {type : Number, default: '0'},
isFav : {type : Boolean, default: 'false'}
}
});
Via Mongoose I've Created an API, but PROBLEM starts when I want to add Products to a specific Dept(Department), A whole new Instance of Department is created instead of the new Product getting appended to the existing Department.
My POST/PUT stated below is
.put(function(req, res) {
// use our Dept model to find the Dept we want
Dept.findById(req.params.Dept_id, function(err, Dept) {
if (err)
res.send(err);
Dept.name = req.body.name; // update the Dept info
Dept.sku = req.body.sku;
Dept.Product.name = req.body.ProductName;
Dept.Product.sku = req.body.ProductSKU;
Dept.Product.description = req.body.ProductDescription;
Dept.Product.price = req.body.ProductPrice;
Dept.Product.quantity = req.body.ProductQuantity;
Dept.Product.isFav = req.body.ProductisFav;
// save the Dept
Dept.save(function(err) {
if (err)
res.send(err);
res.json({ message: 'Department updated!' });
});
});
})
.post(function(req, res) {
var dept = new Dept(); // create a new instance of the Dept model
dept.name = req.body.name; // set the Dept name (comes from the request)
dept.sku = req.body.sku;
dept.Product.name = req.body.ProductName;
dept.Product.sku = req.body.ProductSKU;
dept.Product.description = req.body.ProductDescription;
dept.Product.price = req.body.ProductPrice;
dept.Product.quality = req.body.ProductQuality;
dept.Product.isFav = req.body.ProductisFav;
// save the Dept and check for errors
dept.save(function(err) {
if (err)
res.send(err);
res.json({ message: 'Department created!' });
});
})
e.g. We can easily see from the output that Different Fruits instead of appending to the same Fruits Dept. are creating a whole another instance. Also why does ProductSchema not have auto generated Object Id?
[
{
"__v": 0,
"_id": "5528027cd4eb13d80cf81f87",
"Product":
{
"isFav": true,
"quantity": 34,
"price": "128",
"description": "1kg",
"sku": "APL",
"name": "Apple"
},
"sku": "FRT",
"name": "Fruits"
},
{
"_id": "552824abd67bf9d81391ad92",
"__v": 0,
"Product":
{
"isFav": true,
"quantity": 0,
"price": "40",
"description": "1kg",
"sku": "ORG",
"name": "Orange"
},
"sku": "FRT",
"name": "Fruits"
}
]
Thank You for being Patient.

Answer 1

You have declared Product to be an object and not an array.
Product: {...} --> Product: [{...}]
Also you would need to update your put method to push a new item onto the Dept.Product array rather than updating the properties of Dept. You can read how to properly use subdocs in the documentation.