I am trying to calculate the average value of the ratings for a Product. Instead of calculating the average rating of the Product every time when we need the value. I calculate it every time someone rates it. I am expecting to see additional fields in the Document but for some reason console.log('stats: ', stats); is printing out an empty array and the fields are not added to the Document. Let me know what I am doing wrong.
const calculateAvgRating = async (id) => {
try {
const stats = await Product.aggregate([
{ $match: { _id: id } },
{
$addFields: {
avgRating: {
$avg: '$ratings.star',
},
nRatings: {
$size: '$ratings',
},
},
},
]);
console.log('stats: ', stats);
} catch (err) {
console.log(`calculateAvgRating error: ${err}`);
}
};
Schema
import mongoose from 'mongoose';
const { ObjectId } = mongoose.Schema;
const ParentSchema = new mongoose.Schema(
{
title: {
type: String,
trim: true,
required: true,
maxlength: 32,
text: true,
},
slug: {
type: String,
unique: true,
lowercase: true,
index: true,
},
price: {
type: Number,
required: true,
trim: true,
maxlength: 32,
},
quantity: Number,
ratings: [
{
star: Number,
postedBy: { type: ObjectId, ref: 'User' },
},
],
},
{
timestamps: true,
}
);
export default mongoose.models.Product ||
mongoose.model('Product', ParentSchema);
Related
So I created this controller to get me the sum of all the orders totalPrice made by months
const getMonthlyOrderTotal = async (req, res) => {
try {
const year = req.params.year;
const aggregatePipeline = [
{
$match: {
createdAt: {
$gte: new Date(`${year}-01-01T00:00:00.000`),
$lt: new Date(`${year}-12-31T23:59:59.999`)
}
}
},
{
$group: {
_id: {
$month: "$createdAt"
},
total: {
$sum: "$totalPrice"
}
}
},
{
$sort: {
_id: 1
}
}
];
const orderTotals = await Order.aggregate(aggregatePipeline);
res.json(orderTotals);
} catch (err) {
res.status(500).json({ message: err.message });
}
};
this is the orderModel I am using
import mongoose from "mongoose";
const orderSchema = mongoose.Schema(
{
user: {
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: "User",
},
client: {
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: "Client",
},
orderItems: [
{
name: { type: String, required: true },
qty: { type: Number, required: true },
image: { type: String },
price: { type: Number, required: true },
product: {
type: mongoose.Schema.Types.ObjectId,
required: true,
ref: "Product",
},
},
],
totalPrice: {
type: Number,
required: true,
default: 0.0,
},
taxPrice: {
type: Number,
required: true,
default: 0.0,
},
isPaid: {
type: Boolean,
required: true,
default: false,
},
paidAt: {
type: Date,
},
isDelivered: {
type: Boolean,
required: true,
default: false,
},
deliveredAt: {
type: Date,
},
},
{
timestamps: true,
}
);
const Order = mongoose.model("Order", orderSchema);
export default Order;
and when I try to test this API in postman "http://localhost:5001/orders/orderstotal/2022" I always get an empty array even though there is stored data in mongoDB orders Collection
I have two models which are Product & Category with many to many relationship.
Following are my models
This is the model for Product
//Product.js
const mongoose = require("mongoose");
const { Schema } = mongoose;
const { ObjectId } = Schema;
const product = {
name: {
type: String,
required: true,
trim: true,
minlength: [2, "Too short"],
maxlength: [32, "Too long"],
unique: true,
},
slug: {
type: String,
unique: true,
lowercase: true,
index: true,
},
category: [
{
type: ObjectId,
ref: "Category",
},
],
description: {
type: String,
maxlength: 200,
},
price: {
type: Number,
required: true,
trim: true,
maxlength: 32,
},
shipping: {
type: String,
enum: ["Yes", "No"],
},
color: [
{
type: String,
enum: ["Black", "Brown", "Silver", "White", "Blue"],
},
],
sold: {
type: Number,
default: 0,
},
quantity: {
type: Number,
},
images: [
{
public_id: String,
url: String,
},
],
};
const productSchema = new Schema(product, { timestamps: true });
const Product = mongoose.model("Product", productSchema);
module.exports = Product;
This is the model for Category
//Category.js
const mongoose = require("mongoose");
const { Schema } = mongoose;
const { ObjectId } = Schema;
const category = {
name: {
type: String,
required: true,
trim: true,
max: 32,
unique: true,
},
subCategories: [
{
type: Schema.Types.ObjectId,
ref: "Category",
},
],
parent: {
type: Schema.Types.ObjectId,
ref: "Category",
},
products: [
{
type: ObjectId,
ref: "Product",
},
],
slug: {
type: String,
required: "URL can't be empty",
unique: true,
},
};
const categorySchema = new Schema(category, { timestamps: true });
//Validate the slug to ensure proper url is given
// categorySchema.path("slug").validate((val) => {
// urlRegex =
// /(ftp|http|https):\/\/(\w+:{0,1}\w*#)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%#!\-/]))?/;
// return urlRegex.test(val);
// }, "Invalid URL.");
const autoPopulateChildren = function (next) {
this.populate("subCategories");
// this.populate("parent");
next();
};
categorySchema
.pre("findOne", autoPopulateChildren)
.pre("findById", autoPopulateChildren)
.pre("find", autoPopulateChildren);
const Category = mongoose.model("Category", categorySchema);
module.exports = Category;
So, product has a foreign keys of category in array of category. Whereas Category has foreign keys of product in array of products. How do you join them ?
I tried this & it doesn't work. It returns empty object
router.get("/products", [RequireSignIn], async (req, res) => {
try {
const products = await Product.find({}).aggregate({
$lookup: {
from: "Category",
localField: "category",
foreignField: "_id",
as: "ProductCategories",
},
});
return res.status(200).send(products);
} catch (error) {
return res.status(200).send(error);
}
});
here is my schema
const CustomerSchema = mongoose.Schema(
{
name: {
type: String,
trim: true,
},
purchased: {
modelsId: [{
type: mongoose.Schema.ObjectId ,
trim: true,
}],
collectionsId: [{
type: mongoose.Schema.ObjectId,
trim: true,
}]
}
},
{ timestamps: true }
);
and i want to add an array to modelsId array in purchased object with mongoose
Customer.findOneAndUpdate({ _id: customer._id }, { $addToSet: { 'purcased.modelsId': { $each: modelsId } } },
{ new: true }).then(res => {
console.log('response', res)
}).catch(e => {
console.log('error', e)
})
and it's not working!
thank you for your help!
Looks like you may just have a simple spelling error? Try changing 'purcased.modelsId' to 'purchased.modelsId'. You're just missing an 'h' I think!
i'm trying to update a object in array.
My field wasn't an array before, i used to use this code to update my field :
exports.updateStock = (req, res, next) => {
console.log(req.body.order.products);
let myOperations = req.body.order.products.map((prod) => {
return {
updateOne: {
filter: { _id: prod._id },
update: { $inc: { stock: -prod.quantity, sold: +prod.quantity } },
},
};
});
Product.bulkWrite(myOperations, {}, (err, products) => {
if (err) {
console.log("im here", err);
return res.status(400).json({
error: "Bulk operation failed",
});
}
next();
});
};
field :
stock: [
{
size: {
type: String,
required: true,
},
stock: {
type: Number,
required: true,
},
},
],
any idea how i can update my stock.stock based on size?
the size is passed with product -> prod.size
Example :
in store i have size : M | 100 stocks
L | 150 stocks
XS| 10 stocks
user : want to buy size M and quantity 2
so after the order i have to update Size m stocks
100-2 = 98 stocks remaing after order :
M | 98 stocks
L | 150 stocks
XS| 10 stocks
My entire product schema :
const mongoose = require("mongoose");
const { ObjectId } = mongoose.Schema;
const productSchema = new mongoose.Schema(
{
name: {
type: String,
trim: true,
required: true,
maxlength: 32,
},
description: {
type: String,
trim: true,
required: true,
maxlength: 2000,
},
discountprice: {
type: Number,
maxlength: 32,
trim: true,
},
price: {
type: Number,
required: true,
maxlength: 32,
trim: true,
},
category: [
{
type: ObjectId,
ref: "Category",
required: true,
},
],
subcategory: [
{
type: ObjectId,
ref: "SubCategory",
required: true,
},
],
stock: [
{
size: {
type: String,
required: true,
},
stock: {
type: Number,
required: true,
},
},
],
sold: {
type: Number,
default: 0,
},
photo: [String],
},
{ timestamps: true }
);
module.exports = mongoose.model("Product", productSchema);
You can use arrayfilters to update stock on the base of size in array stock,
updateOne: {
filter: { _id: prod._id },
update: { $inc: { "stock.$[elem].stock": -prod.quantity, sold: +prod.quantity } },
arrayFilters: [{ "elem.size": prod.size }]
}
I have a item model where it a virtual field to refer stock badges.
'use strict';
const mongoose = require('mongoose');
const mongooseHidden = require('mongoose-hidden')();
const Badge = mongoose.model('Badge');
const validateProperty = function(property) {
return (property.length);
};
const Schema = mongoose.Schema;
const ItemSchema = new Schema({
itemCode: {
type: Number,
index: {
unique: true,
sparse: true // For this to work on a previously indexed field, the index must be dropped & the application restarted.
},
required: true
},
itemName: {
type: String,
uppercase: true,
trim: true
},
barcode: {
type: String,
trim: true
},
category: {
type: Schema.Types.ObjectId,
ref: 'Category'
},
subCategory: {
type: Schema.Types.ObjectId,
ref: 'SubCategory'
},
updated: {
type: Date
},
created: {
type: Date,
default: Date.now
},
status: {
type: String,
enum: [
'active', 'inactive', 'removed'
],
default: 'active'
}
}, {id: false});
ItemSchema.virtual('badges').get(function() {
return this.getAvailableBadges();
});
ItemSchema.methods.getAvailableBadges = function() {
Badge.find({
item: this._id
}, (err, badges) => {
if (badges) {
return badges;
} else {
return [];
}
});
};
ItemSchema.set('toJSON', {virtuals: true});
ItemSchema.set('toObject', {virtuals: true});
ItemSchema.plugin(mongooseHidden, {
hidden: {
_id: false,
__v: true
}
});
mongoose.model('Item', ItemSchema);
And batch model as below
'use strict';
const mongoose = require('mongoose');
const mongooseHidden = require('mongoose-hidden')();
const validateProperty = function(property) {
return (property.length);
};
const Schema = mongoose.Schema;
const BadgeSchema = new Schema({
item: {
type: Schema.Types.ObjectId,
ref: 'Item'
},
qty: {
type: Number,
validate: [validateProperty, 'Please enter Quantity !']
},
purchasingPrice: {
type: Number,
validate: [validateProperty, 'Please enter purchasingPrice !']
},
sellingPrice: {
type: Number,
validate: [validateProperty, 'Please enter sellingPrice !']
},
updated: {
type: Date
},
created: {
type: Date,
default: Date.now
},
status: {
type: String,
enum: [
'active', 'inactive', 'removed'
],
default: 'active'
}
});
BadgeSchema.plugin(mongooseHidden, {
hidden: {
_id: false,
__v: true
}
});
mongoose.model('Badge', BadgeSchema);
Item's badge virtual field doesn't got populated.
How are we going to work with async getter method
I have put some console log statements and found that getAvailableBadges is getting data.
I need to send json object with virtual field values via express. How to I do it?
What I did was create an virtual property
ItemSchema.virtual('badges', {
ref: 'Badge',
localField: '_id',
foreignField: 'item'
});
And populate it with
{
path: 'badges',
select: [
'qty', 'purchasingPrice', 'sellingPrice'
],
options: {
sort: {
'created': -1
}
}
}
Well, the operations are asynchronous so you have to wait for the callback to fire.
You can only return the values by passing it in the callback (or you can set the values of the current object prior to calling the callback).
I think it would be something like this:
ItemSchema.virtual('badges').get(function (callback) {
Badge.find({ item: this._id }, callback);
};
Then you would use it like
item.badges(function (err, badges) {
// do something with badges
});