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EDIT added mongoose.model.
I'm pretty new to mongodb and mongoose. I'm not able to populate books to authors in mongoose.
Can anyone help me with that? Here is my code. I removed unnecessary fields
const authorSchema = mongoose.Schema({
_id:{
type: String,
required: true,
unique: true,
trim: true
},
name: {
type: String,
required: true,
trim: true
},
books: [{
type: String,
ref: "Book"
}]
}, {_id:false})
const Author = mongoose.model('Author', authorSchema)
module.exports = {Author}
And my books schema looks as following
const bookSchema = mongoose.Schema({
_id:{
type:String,
required:true,
unique:true,
trim: true
},
name: {
type: String,
required: true,
trim: true,
unique: true
},
description:{
type: String,
trim: true,
default: 'No description specified'
},
datePublished: {
type: Date,
trim: true,
default: '01/01/2001'
},
author:{
type: String,
ref: 'Author',
required: true
}
}, {_id:false})
const Book = mongoose.model('Book', bookSchema)
module.exports = {Book}
Here is the route to populate them together
AuthorRouter.get('/authors/:id', async(req, res)=>{
const authorID = req.params.id
try {
const author = await Author.findById(authorID)
try {
const populated = await author.populate({path: 'books.book', select: 'name description -_id'})
console.log(populated);
res.status(201).send(populated)
} catch (e) {
res.status(401).send(`${e}\n Unable to populate categories`)
}
} catch (error) {
res.status(401).send('Unable to find author')
}
})
Output is following with empty books array:
{
"_id": "123",
"name": "testuser",
"books": [],
"__v": 0
}
Populating an arrays of refs works the same way as a single ref. Just call the populate method on the query and an array of documents will be returned in place of the original _id's.
In your case that would be:
const populated = await author.populate({path: 'books', select: 'name description -_id'});
Hey i have modify your code , try to use this one
This is your author schema file
const Schema = mongoose.Schema;
const authorSchema = mongoose.Schema({
_id:{
type: String,
required: true,
unique: true,
trim: true
},
name: {
type: String,
required: true,
trim: true
},
books: [{
type: Schema.Types.ObjectId,
ref: "bookSchema"
}]
}, {_id:false})
const Author = mongoose.model('Author', authorSchema)
module.exports = {Author}
And this is your route
AuthorRouter.get('/authors/:id', async(req, res)=>{
const authorID = req.params.id
try {
const author = await Author.findById(authorID)
try {
const populated = await author.find().populate('books');
console.log(populated);
res.status(201).send(populated)
} catch (e) {
res.status(401).send(`${e}\n Unable to populate categories`)
}
} catch (error) {
res.status(401).send('Unable to find author')
}
})
I have some issues
Cant populate CartProduct, just show the ObjectId.
There is way to make every time that CartProduct create, add automatically to? cart.
is this the right way of schemas structure?
Cart
const CartSchema = new Schema({
active: { type: Boolean, required: true, default: true },
createAt: { type: Date, default: Date.now },
client: { type: Schema.Types.ObjectId, ref: "User", required: true },
products: [{ type: Schema.Types.ObjectId, ref: "CartProduct" }],
});
const Cart = model("Cart", CartSchema);
Cart Product
const CartProductSchema = new Schema({
item: { type: Schema.Types.ObjectId, ref: "Product", required: true },
cart: { type: Schema.Types.ObjectId, ref: "Cart", required: true },
quantity: { type: Number, required: true },
totalPrice: { type: Number, required: true },
});
const CartProduct = model("CartProduct", CartProductSchema);
Product
const ProductSchema = new Schema({
name: { type: String, required: true },
price: { type: Number, required: true },
image: { type: String, required: true },
category: { type: Schema.Types.ObjectId, ref: "Category", require: true },
});
const Product = model("Product", ProductSchema);
Cart Controller
router.post("/", async (req, res) => {
try {
const { userId } = req.body;
const cart = await Cart.findOne({ client: userId
}).populate("CartProduct");
if (cart === null) {
const newCart = new Cart({
client: userId,
});
await newCart.save();
return res.status(201).send({ cart: newCart });
}
res.status(200).send({ cart });
} catch (error) {
res.status(500).send(error);
}
});
Add Product to Cart
router.post("/addProductToCart", async (req, res) => {
try {
const { item, cart, quantity, price } = req.body;
const newProduct = new CartProduct({
item,
cart,
quantity,
totalPrice: price * quantity,
});
await newProduct.save();
await Cart.findOneAndUpdate(
{ _id: cart },
{ $push: { products: newProduct } },
{
new: true,
}
);
res.status(201).send({ message: "New Product Added To Cart" });
} catch (error) {
res.status(500).send(error);
}
});
adding product to cart does working,
but populate not working
adding the output
{
"cart": {
"active": true,
"products": [
"602bc081daf867167c2eb5da"
],
"_id": "602aab802f625d1654805ef0",
"client": "601c50211c94cf5d642c67fb",
"createAt": "2021-02-15T17:12:32.997Z",
"__v": 0
}
}
your missing { in cartSchema
const CartSchema = new Schema({
active: { type: Boolean, required: true, default: true },
createAt: { type: Date, default: Date.now },
client: { type: Schema.Types.ObjectId, ref: "User", required: true },
products: [{ type: Schema.Types.ObjectId, ref: "CartProduct" }],
});
export the the models like this
module.exports = Cart
There is way to make every time that CartProduct create, add automatically to? cart
there is not a automatic way for adding new _id of CartProduct to collection, so you should use findOneAndUpdate() or find() and push in to products array and save()
is this the right way of schemas structure
yes, It is.
so for populate you can try:
let resultCarts = await Cart.find(filter).populate("products")
let resultProducts = await Product.find(filter).populate("category")
so change the CartProduct to products because you should pass name of field as a argument not name of schema
await Cart.findOne({ client: userId
}).populate("products");
Im relatively new to MongoDB and Mongoose. Im much used to MySQL so in used to inner joining tables on calls. Ive read a lot that you can link two Mongoose Schemas to achieve the same outcome. How would like like the two schemas together to when I make a call to get a chore by id it'll return the chore and then for the assignedTo & createdBy have the user scheme data for the said userId?
Chore Schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var ChoreSchema = new Schema({
title: {
type: String,
required: true
},
desc: {
type: String,
required: true
},
time: {
type: Number,
required: true
},
reaccurance: {
type: [{
type: String,
enum: ['Daily', 'Weekly', 'Bi-Weekly', 'Monthly']
}]
},
reward: {
type: Number,
required: true
},
retryDeduction: {
type: Number,
required: false
},
createdDate: {
type: Date,
default: Date.now
},
createdBy: {
type: String,
required: true
},
dueDate: {
type: Date,
required: true
},
status: {
type: [{
type: String,
enum: ['new', 'pending', 'rejected', 'completed', 'pastDue']
}],
default: ['new']
},
retryCount: {
type: Number,
default: 0,
required: false
},
rejectedReason: {
type: String,
required: false
},
familyId: {
type: String,
required: true
},
assignedTo: {
type: String,
required: false,
default: ""
}
});
let Chores = module.exports = mongoose.model('Chores', ChoreSchema);
module.exports.get = function (callback, limit) {
Chores.find(callback).limit(limit);
};
User Schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var UserSchema = new Schema({
firstName: {
type: String,
required: true
},
lastName: {
type: String,
required: true
},
role: {
type: [{
type: String,
enum: ['Adult', 'Child']
}]
},
birthday: {
type: String,
required: false
},
familyId: {
type: String,
required: true
},
balance: {
type: Number,
required: true,
default: 0.00
}
});
let Users = module.exports = mongoose.model('Users', UserSchema);
module.exports.get = function (callback, limit) {
Users.find(callback).limit(limit);
};
Im trying to link ChoreSchema.createdBy & ChoreScheme.assignedTo by UserSchema._id
How I make the call in Node.js:
exports.index = function(req, res) {
Chore.get(function(err, chore) {
if (err)
res.send(err);
res.json({
message: 'Chore List',
data: chore
});
});
};
Mongoose has a more powerful alternative called populate(),
which lets you reference documents in other collections.
https://mongoosejs.com/docs/populate.html
Here is how you can link ChoreSchema.createdBy and ChoreScheme.assignedTo by UserSchema._id
var mongoose = require('mongoose');
const { Schema, Types } = mongoose;
var UserSchema = new Schema({
firstName: { type: String, required: true },
...
})
var ChoreSchema = new Schema({
title: { type: String, required: true },
...
//The ref option is what tells Mongoose which model to use during population
assignedTo: { type: Types.ObjectId, ref: 'Users' },
createdBy: { type: Types.ObjectId, ref: 'Users' },
})
let Chores = mongoose.model('Chores', ChoreSchema);
let Users = mongoose.model('Users', UserSchema);
Then in your express route handler you can populate assignedTo & createdBy like this
router.get('/chores/:id', function (req, res) {
const choreId = req.params.id;
Chores.find({ _id: choreId })
.populate('createdBy') // populate createdBy
.populate('assignedTo') // populate assignedTo
.exec(function (err, chore) {
if(err) {
return res.send(err)
}
res.json({ message: 'Chore List', data: chore });
});
})
In this application, I am trying to update a field value, if it is successful then I want to save into a log collection, however, not all the data are saved in the log collection, I am not sure if I am doing it the right way, would appreciate if someone could help out.
here is the query :
// both models(Log & Inventory are imported)
router.get("/add_product/:id/:num/:quantity/:order", (req, res) => {
var id = req.params.id;
var quantity = req.params.quantity;
var order = req.params.order;
// console.log('id----', id);
var num_mod = req.params.num;
var modified_count = parseInt(num_mod) - parseInt(quantity);
console.log("num_mod----", num_mod);
Inventory.findByIdAndUpdate(id, { quantity: parseInt(num_mod) }, { new: true }, function(
err,
inventory
) {
if (err) {
console.log("err", err);
res.status(500).send(err);
} else {
console.log(inventory.name);
const newLog = new Log({
name: inventory.name,
description: inventory.description,
price: parseInt(inventory.price),
quantity: parseInt(inventory.quantity),
modified_quantity: parseInt(modified_count),
itemDest: order //this is not being saved
});
newLog.save(function(err, Log) {
if (err) {
console.log(err);
} else {
console.log("add log success");
res.send(inventory);
}
});
}
});
});
URL from front end :
// order is a string
here is the Log schema :
const mongoose = require("mongoose");
const LogSchema = new mongoose.Schema(
{
// _id: mongoose.Schema.Types.ObjectId,
name: { type: String, required: true },
description: { type: String, required: true },
price: { type: Number, required: true },
quantity: { type: Number, required: true },
modified_quantity: { type: Number, required: true },
supplier: String,
taxable: Boolean,
itemDest: String
},
{ timestamps: true }
);
// Create model from the schema
const Log = mongoose.model("Log", LogSchema);
// Export model
module.exports = Log;
and here is the inventory schema
const mongoose = require("mongoose");
//create Schema
const InventorySchema = new mongoose.Schema(
{
// _id: mongoose.Schema.Types.ObjectId,
name: { type: String, required: true },
description: { type: String, required: true },
price: { type: Number, required: true },
quantity: { type: Number, required: true },
supplier: String,
taxable: Boolean
},
{ timestamps: true }
);
// Create model from the schema
const Inventory = mongoose.model("Inventory", InventorySchema);
// Export model
module.exports = Inventory;
My issue is with this line "itemDest: order" in the query, I intend to save the value of "order" extracted from "req.params.order" into "itemDest" but it doesn't save.
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
});