Related
I have this record
{
"_id" : ObjectId("5dfdff479ad032cbbc673507"),
"selection" : [
{
"highlights" : "test",
"comment" : "CHANGE THIS",
"el" : "body:nth-child(2)>div:nth-child(2)#root>div.App>p:nth-child(1)"
},
{
"highlights" : "Barrett’s lyrical prose opens with a clever and tender solution",
"comment" : "",
"el" : "body:nth-child(2)>div:nth-child(2)#root>div.App>p:nth-child(2)"
}
],
"category" : [],
"status" : "",
"url" : "http://localhost:3000/theone",
"title" : "React App test",
"__v" : 4
}
And I want to update the comment. I have tried to use update and findOneAndUpdate and nothing is working. Here is my attempt
WebHighlight.findOneAndUpdate(
{
_id: req.params.highlight,
"selection.highlights": "test"
},
{ "selection.$.comment": "yourValue" }
);
That req.params.highlight is the id (I even hardcoded it)
I also tried this
WebHighlight.findById(req.params.highlight, (err, book) => {
var test = [...book.selection];
test[0].comment = "somethibf"
book.save();
res.json(book);
});
And nothing is working.
This is the model
const webhighlightsModel = new Schema({
selection: { type: Array, default: "" },
category: { type: Array, default: [] },
title: { type: String },
url: { type: String },
status: { type: String, default: "" }
});
Actually your code seems to work, but findOneAndUpdate returns the old document if you don't give {new: true} option.
I think for this reason, you think the update wasn't successfull, but if you check your collection, you will see the update.
WebHighlight.findOneAndUpdate(
{
_id: req.params.highlight,
"selection.highlights": "test"
},
{ "selection.$.comment": "yourValue" },
{ new: true }
)
.then(doc => res.send(doc))
.catch(err => res.status(500).send(err));
Also I think it would be better if selection had a sub schema like this:
const mongoose = require("mongoose");
const schema = new mongoose.Schema({
selection: [
new mongoose.Schema({
highlights: String,
comment: String,
el: String
})
],
category: { type: Array, default: [] },
title: { type: String },
url: { type: String },
status: { type: String, default: "" }
});
module.exports = mongoose.model("WebHighlight", schema);
So with this every selection would an _id field, and it would be better to update with this _id.
You should use the $set operator to update existing values:
WebHighlight.findOneAndUpdate(
{
_id: req.params.highlight,
"selection.highlights": "test"
},
{ '$set': { "selection.$.comment": "yourValue" } }
);
Update: I am looking for an answer that works within mongodb projection: https://docs.mongodb.com/manual/reference/method/db.collection.findOne/#definition
I am trying to filter a query on a subdocument using projection so that it only returns a specific array. But when filtering the result also includes an array of another subdocument. When I don't filter it only returns the found document.
I tried different filtering options including and excluding positional elements, but can't get the desired return.
Mongoose schema
const stationSchema = new mongoose.Schema({
mac: String,
stationName: String,
syncReadings: Boolean,
temperature: Array,
humidity: Array,
measures: [{
date: Date,
temperature: Number,
humidity: Number
}],
lastUpdated: Date
});
// Define user schema
var userSchema = mongoose.Schema({
local : {
email : String,
password : String
},
facebook : {
id : String,
token : String,
name : String,
email : String
},
twitter : {
id : String,
token : String,
displayName : String,
username : String
},
google : {
id : String,
token : String,
email : String,
name : String
},
apiKey: String,
stations : [stationSchema]
},
{
usePushEach: true
}
);
Api handler
app.get('/api/stations/:stationName/measures', function(req, res, next) {
var user = {
apiKey: req.user.apiKey
}
const query = {
apiKey: user.apiKey,
stations.stationName': req.params.stationName
}
const options = {
'stations.measures': 1
}
User.findOne(query, options)
.exec()
.then(stations => {
res.status(200).send(stations)
})
.catch(err => {
console.log(err);
res.status(400).send(err);
})
});
There are two stations under one user:
[
{
"_id": "5c39c99356bbf002fb092ce9",
"stations": [
{
"stationName": "livingroom",
"mac": "5C:CF:7F:77:12:FB",
"_id": "5c39c9ab56bbf002fb092cea",
"lastUpdated": "2019-01-12T11:07:01.802Z",
"syncReadings": false,
"measures": [],
"humidity": [],
"temperature": [
{
"date": "2019-01-12T11:07:01.802Z",
"temperature": "20"
}
]
},
{
"stationName": "office",
"mac": "5C:CF:7F:77:12:FC",
"_id": "5c39cacdce4ac903123f0150",
"measures": [],
"humidity": [],
"temperature": []
}
]
}
]
API call
http://localhost:8080/api/stations/livingroom/measures
Result
{
"_id": "5c39c99356bbf002fb092ce9",
"stations": [
{
"measures": []
},
{
"measures": []
}
]
}
Projection options tried
const options = {
'stations.measures': 1
}
const options = {
'stations.$.measures': 1
}
const options = {
'stations.$': 1,
'stations.$.measures': 1
}
const options = {
'stations.$': 1,
'stations.measures': 1
}
What am I doing wrong?
try using these querying params only and after that you will get a user with a requested station..
var user = {
apiKey: req.user.apiKey
}
const query = {
apiKey: user.apiKey,
'stations.stationName': req.params.stationName
}
then do this
User.findOne(query, options)
.exec()
.then(stations => {
for(let station of stations){
if(station.measures[1]){ // here it is the index
res.status(200).send(stations);
}
}
})
.catch(err => {
console.log(err);
res.status(400).send(err);
})
actually in mongoose you cannot query sub-sub documents to you will have to you this approach.. You can only query sub docs only like you have done
How do I add an item to Mongoose, if I want to push it to an item of the array?
I want to push it to the document with predefined _id, to the 'productList' array with predefined 'id', to the 'items' array.
{
"_id" : ObjectId("5ba94316a48a4c828788bcc9"),
"productList" : [
{
"id" : 1,
"items" : [
{
"id" : 1,
"name" : "FLOSS 500",
}
]
}
]
}
I thought that it should be something like this, but it did not work:
Products.findOneAndUpdate({_id: req.body._id, productList: {id: req.body.id}}, {$push: {'items': req.body.product}})
You can try this with positional operator $. For search by nested array property use dot-separated syntax:
Products.findOneAndUpdate({
_id: req.body._id,
'productList.id': req.body.id
}, { $push: { 'productList.$.items': req.body.product } });
Full example:
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const Products = mongoose.model('Test', new Schema({
productList: []
}));
mongoose.connect("mongodb://localhost:27017/myapp");
let item = new Products({
"_id": mongoose.Types.ObjectId("5ba94316a48a4c828788bcc9"),
"productList": [
{
"id": 1,
"items": [
{
"id": 1,
"name": "FLOSS 500",
}
]
}
]
});
Products.deleteMany({}).then(() => {
return Products.create(item);
}).then(() => {
return Products.findOneAndUpdate({
_id: mongoose.Types.ObjectId("5ba94316a48a4c828788bcc9"),
'productList.id': 1
}, {
$push: {
'productList.$.items': {
"id": 2,
"name": "FLOSS 600",
}
}
});
}).then(() => {
return Products.find({
_id: mongoose.Types.ObjectId("5ba94316a48a4c828788bcc9"),
'productList.id': 1
});
}).then(data => {
console.log(data);
if (data) {
console.log(data[0].productList);
/* [{"id":1,"items":[{"id":1,"name":"FLOSS 500"},{"id":2,"name":"FLOSS 600"}]}] */
}
}).catch(err => {
console.error(err);
});
Lemme take time to explain what is happening from start to finish.
Preamble:
A user a follows 10 other people. When user A logs in, an X number of posts from each of the 10 people are pulled into view.
I do not know if it is the right thing to do, and will appreciate a better way of doing it. However, I wanna give it a try, and it ain't working.
Follow Model:
let mongoose = require('mongoose');
let Schema = mongoose.Schema;
let FollowSchema = new Schema({
user: {
type: Schema.Types.ObjectId,
ref: 'User'
},
followers: [{
type: Schema.Types.ObjectId,
ref: 'Card'
}],
following: [{
type: Schema.Types.ObjectId,
ref: 'Card'
}]
});
module.exports = mongoose.model('Follow', FollowSchema);
Card Model
let mongoose = require('mongoose');
let Schema = mongoose.Schema;
let CardSchema = new Schema({
title: String,
content: String,
createdById: {
type: Schema.Types.ObjectId,
ref: 'User'
},
createdBy: {
type: String
}
});
module.exports = mongoose.model('Card', CardSchema);
Follow logic
When user A follows user B, do two things:
Push the user_id of B to user A document on field 'following' (A is following B)
Push user_id of A to user B document on field 'followers' (B is followed by A)
router.post('/follow', utils.loginRequired, function(req, res) {
const user_id = req.user._id;
const follow = req.body.follow_id;
let bulk = Follow.collection.initializeUnorderedBulkOp();
bulk.find({ 'user': Types.ObjectId(user_id) }).upsert().updateOne({
$addToSet: {
following: Types.ObjectId(follow)
}
});
bulk.find({ 'user': Types.ObjectId(follow) }).upsert().updateOne({
$addToSet: {
followers: Types.ObjectId(user_id)
}
})
bulk.execute(function(err, doc) {
if (err) {
return res.json({
'state': false,
'msg': err
})
}
res.json({
'state': true,
'msg': 'Followed'
})
})
})
Actual DB values
> db.follows.find().pretty()
{
"_id" : ObjectId("59e3e27dace1f14e0a70862d"),
"user" : ObjectId("59e2194177cae833894c9956"),
"following" : [
ObjectId("59e3e618ace1f14e0a708713")
]
}
{
"_id" : ObjectId("59e3e27dace1f14e0a70862e"),
"user" : ObjectId("59e13b2dca5652efc4ca2cf5"),
"followers" : [
ObjectId("59e2194177cae833894c9956"),
ObjectId("59e13b2d27cfed535928c0e7"),
ObjectId("59e3e617149f0a3f1281e849")
]
}
{
"_id" : ObjectId("59e3e71face1f14e0a708770"),
"user" : ObjectId("59e13b2d27cfed535928c0e7"),
"following" : [
ObjectId("59e3e618ace1f14e0a708713"),
ObjectId("59e13b2dca5652efc4ca2cf5"),
ObjectId("59e21942ca5652efc4ca30ab")
]
}
{
"_id" : ObjectId("59e3e71face1f14e0a708771"),
"user" : ObjectId("59e3e618ace1f14e0a708713"),
"followers" : [
ObjectId("59e13b2d27cfed535928c0e7"),
ObjectId("59e2194177cae833894c9956")
]
}
{
"_id" : ObjectId("59e3e72bace1f14e0a708779"),
"user" : ObjectId("59e21942ca5652efc4ca30ab"),
"followers" : [
ObjectId("59e13b2d27cfed535928c0e7"),
ObjectId("59e2194177cae833894c9956"),
ObjectId("59e3e617149f0a3f1281e849")
]
}
{
"_id" : ObjectId("59f0eef155ee5a5897e1a66d"),
"user" : ObjectId("59e3e617149f0a3f1281e849"),
"following" : [
ObjectId("59e21942ca5652efc4ca30ab"),
ObjectId("59e13b2dca5652efc4ca2cf5")
]
}
>
With the above database results, this is my query:
Query
router.get('/follow/list', utils.loginRequired, function(req, res) {
const user_id = req.user._id;
Follow.findOne({ 'user': Types.ObjectId(user_id) })
.populate('following')
.exec(function(err, doc) {
if (err) {
return res.json({
'state': false,
'msg': err
})
};
console.log(doc.username);
res.json({
'state': true,
'msg': 'Follow list',
'doc': doc
})
})
});
With the above query, from my little understanding of Mongoose populate, I expect to get cards from each of the Users in the following array.
My understanding and expectations might be wrong, however with such an endgoal, is this populate approach okay? Or am I trying to solve an aggregation task with population?
UPDATE:
Thanks for the answer. Getting quite close, but still, the followingCards array contains no result. Here's the contents of my current Follow model:
> db.follows.find().pretty()
{
"_id" : ObjectId("59f24c0555ee5a5897e1b23d"),
"user" : ObjectId("59f24bda1d048d1edad4bda8"),
"following" : [
ObjectId("59f24b3a55ee5a5897e1b1ec"),
ObjectId("59f24bda55ee5a5897e1b22c")
]
}
{
"_id" : ObjectId("59f24c0555ee5a5897e1b23e"),
"user" : ObjectId("59f24b3a55ee5a5897e1b1ec"),
"followers" : [
ObjectId("59f24bda1d048d1edad4bda8")
]
}
{
"_id" : ObjectId("59f24c8855ee5a5897e1b292"),
"user" : ObjectId("59f24bda55ee5a5897e1b22c"),
"followers" : [
ObjectId("59f24bda1d048d1edad4bda8")
]
}
>
Here are all the current content I have from Card Model:
> db.cards.find().pretty()
{
"_id" : ObjectId("59f24bc01d048d1edad4bda6"),
"title" : "A day or two with Hubtel's HTTP API",
"content" : "a day or two",
"external" : "",
"slug" : "a-day-or-two-with-hubtels-http-api-df77056d",
"createdBy" : "seanmavley",
"createdById" : ObjectId("59f24b391d048d1edad4bda5"),
"createdAt" : ISODate("2017-10-26T20:55:28.293Z"),
"__v" : 0
}
{
"_id" : ObjectId("59f24c5f1d048d1edad4bda9"),
"title" : "US couple stole goods worth $1.2m from Amazon",
"content" : "for what",
"external" : "https://bbc.com",
"slug" : "us-couple-stole-goods-worth-dollar12m-from-amazon-49b0a524",
"createdBy" : "nkansahrexford",
"createdById" : ObjectId("59f24bda1d048d1edad4bda8"),
"createdAt" : ISODate("2017-10-26T20:58:07.793Z"),
"__v" : 0
}
With the Populate Virtual example from yours (#Veeram), here's the response I get:
{"state":true,"msg":"Follow list","doc":{"_id":"59f24c0555ee5a5897e1b23d","user":"59f24bda1d048d1edad4bda8","following":["59f24b3a55ee5a5897e1b1ec","59f24bda55ee5a5897e1b22c"],"followers":[],"id":"59f24c0555ee5a5897e1b23d","followingCards":[]}}
The followingCards array is empty.
Using the $lookup query on the other hand simply returns []
I'm likely missing something?
You can use either virtual populate or $lookup operator in aggregation pipeline.
Using Virtual Populate
FollowSchema.virtual('followingCards', {
ref: 'Card',
localField: 'following',
foreignField: 'createdById'
});
Follow.findOne({
'user': Types.ObjectId(user_id) })
.populate('followingCards')
.exec(function(err, doc) {
console.log(JSON.stringify(doc));
});
Using $lookup aggregation
Follow.aggregate([
{
"$match": {
"user": Types.ObjectId(user_id)
}
},
{
"$lookup": {
"from": "cards",
"localField": "following",
"foreignField": "createdById",
"as": "followingCards"
}
}
]).exec(function (err, doc) {
console.log(JSON.stringify(doc));
})
var mongoose = require('mongoose'), Schema = mongoose.Schema
var eventSchema = Schema({
title : String,
location : String,
startDate : Date,
endDate : Date
});
var personSchema = Schema({
firstname: String,
lastname: String,
email: String,
dob: Date,
city: String,
eventsAttended: [{ type: Schema.Types.ObjectId, ref: 'Event' }]
});
var Event = mongoose.model('Event', eventSchema);
var Person = mongoose.model('Person', personSchema);
To show how populate is used, first create a person object,
aaron = new Person({firstname: 'Aaron'}) and an event object,
event1 = new Event({title: 'Hackathon', location: 'foo'}):
aaron.eventsAttended.push(event1);
aaron.save(callback);
Then, when you make your query, you can populate references like this:
Person
.findOne({ firstname: 'Aaron' })
.populate('eventsAttended') .exec(function(err, person) {
if (err) return handleError(err);
console.log(person);
});
// only works if we pushed refs to person.eventsAttended
note: change Activity.find to Card.find
const { ObjectID } = require("mongodb");
// import Follow and Activity(Card) schema
const userId = req.tokenData.userId; // edit this too...
Follow.aggregate([
{
$match: {
user: ObjectID(userId)
}
}
])
.then(data => {
// console.log(data)
var dataUsers = data[0].following.map(function(item) {
return item._id;
});
// console.log(dataUsers)
Activity.find(
{ createdById: { $in: dataUsers } },
{
_id: 1,
title: 1,
content: 1,
createdBy: 1,
creatorAvatar: 1,
activityType: 1,
createdAt: 1
}
)
// .sort({createdAt:-1)
.then(posts => res.send({ posts }));
});
I have a data structure like this:
{
students: [
{ name: "john", school: 102, age: 4 },
{ name: "jess", school: 102, age: 11 },
{ name: "jeff", school: 108, age: 7 }
]
}
{
students: [
{ name: "ajax", school: 100, age: 7 },
{ name: "achilles", school: 100, age: 8 },
]
}
{
students: [
{ name: "bob", school: 100, age: 7 },
{ name: "manuel", school: 100, age: 8 },
]
}
I want to update the documents such that any students who is 7 years old is changed to school 101. Is there any way to do this in 1 operation?
Currently mongo only supports updating a single subdocument in an array that match the specified c. This works really well with subdocuments that have a unique identifier (e.g. _id) that you are updating based on but does not work when there are multiple subdocuments that match the criteria (e.g. student ages).
To demonstrate this, I added a student "dupey" to the first set of students so the new records looks like this:
students: [
{ name: "john", school: 102, age: 4 },
{ name: "jess", school: 102, age: 11 },
{ name: "jeff", school: 108, age: 7 },
{ name: "dupey", school: 102, age: 7 }
]
Here is the mongo update statement and the data result after the update completes:
> db.students.update({"students.age":7},{$set: {"students.$.school":101}},true,true);
> db.students.find({}, { _id: 0 });
{ "students" : [ { "name" : "john", "school" : 102, "age" : 4 }, { "name" : "jess", "school" : 102, "age" : 11 }, { "name" : "jeff", "school" : 101, "age" : 7 }, { "name" : "dupey", **"school" : 102**, "age" : 7 } ] }
{ "students" : [ { "name" : "ajax", "school" : 101, "age" : 7 }, { "name" : "achilles", "school" : 100, "age" : 8 } ] }
{ "students" : [ { "name" : "bob", "school" : 101, "age" : 7 }, { "name" : "manuel", "school" : 100, "age" : 8 } ] }
Notice dupey's school has not been changed. There is a mongo feature request to support this. Until then, this has to be broken up into multiple statements. Here is some code I wrote a few weeks back when I had a similar issue.
var mongoose = require('mongoose'),
async = require('async');
mongoose.connect('mongodb://127.0.0.1/products');
var PartsSchema = new mongoose.Schema({
type: String
, partNbr: Number
});
var ProductSchema = new mongoose.Schema({
sku: { type: String, unique: true }
, sku_type: String
, parts: [PartsSchema]
});
Product = mongoose.model('Product', ProductSchema);
Product.remove( function(err) {
if (err) { console.log("unable to remove: " + err); return; }
});
var cigars = new Product({
sku: 'cigar123',
sku_type: 'smoking',
parts: [{type: 'tobacco', partNbr: 4}, {type: 'rolling paper', partNbr: 8}, {type: 'tobacco', partNbr: 4}]
});
var cigarillo = new Product({
sku: 'cigarillo456',
sku_type: 'smoking',
parts: [{type: 'tobacco', partNbr: 4}, {type: 'crush paper', partNbr: 12}]
});
function updateProducts(sku_type, part_type, callback) {
function updateProduct(product_record, callback) {
function denormParts(part_records, sku_id) {
var returnArray = [];
part_records.forEach( function(item) {
var record = { sku_id: sku_id, part_type: item.type, part_id: item._id }
returnArray.push(record);
});
return returnArray;
function updateParts(part_record, callback) {
if (part_record.part_type != part_type) {
return callback(null);
}
console.log("updating based on: " + part_record.sku_id + " " + part_record.part_id);
Product.update( { _id: part_record.sku_id, 'parts._id': part_record.part_id },
{ $set: { 'parts.$.partNbr': 5 } },
function(err, numAffected) {
if (err) { console.log("err4: " + err); return callback(err); }
console.log("records updated: " + numAffected);
callback(null);
});
}
var denormedParts = denormParts(product_record.parts, product_record._id);
console.log("calling updateParts with: " + JSON.stringify(denormedParts));
async.map(denormedParts, updateParts, function(err) {
if (err) { console.log("errored out: " + err); callback(err); }
callback(null);
});
}
Product.find({ "parts.type": part_type, "sku_type": sku_type },
function(err, docs) {
if (err) { console.log("err3: " + err); return callback(err); }
console.log(docs);
async.map(docs, updateProduct, function(err) {
if (err) { console.log("err4: " + err); return callback(err); }
callback(null);
});
}); // end Product.find
}
cigars.save(function(err, product1) {
if(err) { console.log("err1: " + err); return err; }
console.log("saved: " + product1);
cigarillo.save(function(err, product2) {
if(err){ console.log("err2: " + err); return err; }
console.log("saved: " + product2);
updateProducts('smoking', 'tobacco', function(err) {
Product.find({}, function(err, docs) {
if (err) { console.log("err5: " + err); return err; }
console.log("updated data: " + docs);
Product.remove(function(err) {
if (err) { console.log("err6: " + err); return err; }
process.exit();
});
});
});
});
});
I hope this code helps you and others who run into this issue.
you can update an array by specifying its position, for example:
db.students.update({"students.age":7},{$set: {"students.$.school":101}},true,true)