Mongoose - Cannot Update update deeply nested Objects - arrays

Question

var ItemSchema = new Schema({
item: {type: String, required: false},
ts: {type: String, required: true},
selldate: {type: Number, required: false},
replaced: [ReplaceSchema]
});
var ProductSchema = new Schema({
title: {type: String, required: true, trim: true}, //name of the products
artNo: {type: Number, required: true},
catId: {type: String, required: true},
productType: {type: String, required: true}, //physical, textbased or downloadable product | can be 'dl', 'txt', 'phy'
tid: {type: String, required: false}, //only needed for physical products for providing a tid
minItems: {type: Number, required: true},
ts: {type: Number, required: true}, // when was the product online
buyCount: {type: Number, required: true}, // baught how many times
description: {type: String}, //more about the product
price: {type: Number, required: true}, // how much?
discounts: [DiscountSchema], // discount objects
items: [ItemSchema],
images: [], // fullsize images of the product
thumbnails: [], // small preview images of the product
// isPublic: {type: Boolean, required: true}, // if product should be published or not
itemCount: {type: Number, required: false} // how many items exists on the product
});
var CategorySchema = new Schema({
name: {type: String, required: true},
ts: {type: Number, required: true},
products: [ProductSchema]
});
So you see its: Category -> products[] -> items[]
I want to update the Objects in items array in the database and set (at this time undefined field "selldate".
My code snippet for this looks like this:
Category.getProductOfCategory(productId, function(err, boughtProduct) {
if (err) {
res.send({
status: false,
data: err
})
} else {
// console.log('BoughtProduct: ', boughtProduct.products[0])
var bought = boughtProduct.products[0];
// console.log('theItem: ', bought.items.id(item._id));
bought.items.id(item._id).selldate = Date.now();
bought.save(function(err, results) {
if (err) {
res.send({
status: false,
data: err
})
} else {
// i is increased because we need it on line 5
// console.log('itemerr', err)
console.log('saved', results);
j++;
// the next() function is called when you
// want to move to the next item in the array
next();
}
});
}
});
But nothing is happening in the database. Im getting No errors but "results" is just undefined.
Can you please help me?
Update:
I have a solution BUT it works only on executing it once.. after that, its nothing happening again...
The Code:
Category.findById(catId, function (err, data) {
if (err) console.log(err);
data.products.id(productId).items.id(item._id).selldate = Date.now();
data.save(function (err, result) {
if (err) console.log(err);
j++;
next();
});
});

Answer 1

i have posted a sample program containing documents & sub-documents.
Kindly check this and let me know if you need additional information
Schema
const PostSchema = new Schema({
title : String
});
const HomeSchema = new Schema({
"name" : {
type : String,
required : true
},
"city" : {
type : String,
required : true
},
post : [PostSchema]
});
To Save document and subdocument
const cat = new HomeModel({
name: "tiger",
city : "africa",
post : [{
"title" : "tiger post"
}]
});
cat.save((user) => {
console.log("saved");
console.log(user);
})
.catch((err)=>{
console.log("err");
console.log(err);
});
To update document
HomeModel.update({name : "tiger"},{city : "china123"})
.then((home)=>{
console.log("updated");
console.log(home);
})
.catch((error) => {
console.log("error");
console.log(error);
});
To add new subdocument
HomeModel.findOne({name : "tiger"})
.then((home) => {
console.log("findone")
console.log(home);
home.post.push({"title" : "monkey"});
home.save();
})
.catch((err)=>{
console.log("error");
});
To update existing subdocument
method:1
HomeModel.findOne({name : "tiger"})
.then((home) => {
console.log("findone")
const tes=home.post.id("5a3fe65546c99208b8cc75b1");
tes.set({"title" : "it workssdfg"});
home.save();
})
.catch((err)=>{
console.log("error");
});
To find parent document using sub-document id
HomeModel.findOne({"post._id" : "5a3fe65546c99208b8cc75b1"})
.then((home) => {
console.log("findone")
console.log(home);
})
.catch((err)=>{
console.log("error");
});