Document in mongodb collection 'users' is
{
"$oid": "5e612272bcb362513824ff9b",
"name": "abcd",
"email": "test#test.com",
"cart": {
"items": [{
"productId": {
"$oid": "5e614367cae25319c4388288"
},
"quantity": {
"$numberInt": "1"
}
}]
}
}
For a particular users._id and a productId in cart.items, I need to increase the quantity by 1
My nodejs code is
IncrCartItem(prodId){
const db=getDb()
return db
.collection('users').
updateOne({_id: new mongodb.ObjectId(this._id),'this.cart.items.productId': new mongodb.ObjectId(prodId)},{$inc : {'this.cart.items.quantity':1}})
}
Is the query right for checking multiple conditions in updateOne()??
You're kinda there, to "and" them all together you just keep appending them, however the field is wrong and you need to use the positional operator ($) - https://docs.mongodb.com/manual/reference/operator/update/positional/
const filter = {
_id: new mongodb.ObjectId(this._id),
'cart.items.productId': new mongodb.ObjectId(prodId)
};
const update = {
$inc : { 'this.cart.items.$.quantity': 1 }
};
IncrCartItem(prodId){
const db=getDb()
return db
.collection('users').
updateOne(filter,update)
}
Related
I have collection with name products with almost 100k documents. I want to introduce a new key called secondaryKey with unique value uuid in all the documents.
I do this using nodejs.
Problem I am facing:-
When I try the below query,
db.collection('products').updateMany({},{"$set":{secondaryKey: uuid()}});
Here it updates all the documents with same uuid value,
I try with loop to update document one by one,but here issues is I don't have filter value in updateOne because I want to update all the documents.
Can anyone please help me here.
Thanks :)
If you are using MongoDB version >= 4.4 You can try this:
db.products.updateMany(
{},
[
{
$set: {
secondaryKey: {
$function: {
body: function() {
return UUID().toString().split('"')[1];
},
args: [],
lang: "js"
}
}
}
}
]
);
Output
[
{
"_id": ObjectId("..."),
"secondaryKey": "f41b15b7-a0c5-43ed-9d15-69dbafc0ed29"
},
{
"_id": ObjectId("..."),
"secondaryKey": "50ae7248-a92e-4b10-be7d-126b8083ff64"
},
{
"_id": ObjectId("..."),
"secondaryKey": "fa778a1a-371b-422a-b73f-8bcff865ad8e"
}
]
Since it's not the same value you want to put in each document you have to use the loop.
In your loop, you have to update the current document of the iteration. So you have to filter with the _id in the updateOne
The above reply didn't work for me. Plus, it compromises security when you enable javascript on your database (see here $function and javascript enabling on database). The best way is to not overload your server, do your work on local as below:
const { nanoid, customAlphabet } = require('nanoid')
async function asdf() {
const movies = await client.db("localhost").collection("productpost");
var result2 = []
let result = await movies.find({}).toArray()
result.forEach(element => {
const nanoid = customAlphabet('1234567890', 10)
console.log(element.price)
element.price = 4
element.id = nanoid()
result2.push(element)
});
console.log("out reult2", result2)
await movies.deleteMany({})
await movies.insertMany(result2)
})
It will delete any objects on your collections and update with the new ones. Using nanoid as uniqueids.
This is the database object array after adding unique id:
{ "_id": { "$oid": "334a98519a20b05c20574dd1" }, "attach": "[\"http://localhost:8000/be/images/2022/4/bitfinicon.png\"]", "title": "jkn jnjn", "description": "jnjn", "price": 4, "color": "After viewing I am 48.73025772956596% more satisfied with life.", "trademark": "", "category": "[]", "productstate": "Published", "createdat": { "$date": "2022-04-03T17:40:54.743Z" }, "language": "en"}
P.S: Please backup your collection before doing this or filter the array on your needs for not going through all collection.
i have records like this..
{
"photo": "default.jpg",
"roles": [
{
"_id": "5f44d77be830263684eb7914",
"name": "Test",
"__v": 0
}
],
"_id": "5f44d2f4ff04993b40684bf9",
"name": "Test User",
"email": "test#gmail.com",
"id": "5f44d2f4ff04993b40684bf9"
}
i want to weather the role user trying to delete is in use or not. for this i have write a query but it always return an empty array.
const check = await User.find({roles: {$elemMatch: {_id: req.params.id}}});
these are the queries i checked in compass but it always an array
{"roles._id":"5f44d77be830263684eb7914"}
{roles: $elemMatch: {_id: "5f44d77be830263684eb7914"}}
my User document hass roles field something like this.
roles:[
{
type:mongoose.Schema.Types.ObjectId,
ref:"Roles",
validate: {
validator: async function(v) {
return await Roles.findById(v, (err, rec) => rec !== null)
},
message: 'Invalid Object ID'
},
required:true
}
],
IS there any way to enforce integrity constraint like if user tries to delete records which have dependencies on other records then we should not allow user to delete this record.
{
"_id": "5aa9535c6c4f437de713452a",
...
"ht_score": "[0-1]",
"ft_score": "[1-3]",
"et_score": null,
"penalty_local": null,
"penalty_visitor": null,
"comp_name": "UEFA Champions League",
"predictions": [
{
"name": "Ilker Baltaci",
"userid": "*******",
"userFbid": "*****",
"local_team_score": "3",
"away_team_score": "1",
"status": "FT"
},
{
"name": "M. Mustermann",
"userid": "*******",
"userFbid": "*****",
"status": "FT"
}
],
"match_id": "2324756"
}
I have in my mongo db the above collection structure and I want to update some fields of the document as well a field in all objects that reside inside the nested array(predictions).
The reason for the bulk operation is that this code is run as migration over multiple documents.
The problem is that everthing inside $set till "predictions.$[].status" : "FT" works fine but somehow the positional operator $[] does not seem to work.If i replace it with an number index it updates the corresponding object inside the array.I want to update all nested documents inside the array.
I tried both $[] and $ to access status but no luck.
var bulk = db.collection('bets').initializeUnorderedBulkOp();
return new Promise(function (resolve, reject) {
try {
predictions.forEach(function (currentPrediction) {
//Find one and update
let match = games[currentPrediction.match_id];
const query = {'_id': new ObjectID(currentPrediction._id)};
bulk.find(query).update(
{
$set: {
status: match.status,
timer: match.timer,
localteam_score: match.localteam_score,
visitorteam_score: match.visitorteam_score,
ht_score: match.ht_score,
ft_score: match.ft_score,
et_score: match.et_score,
penalty_local: match.penalty_local,
penalty_visitor: match.penalty_visitor,
"predictions.$[].status" : "FT"
}
},{ multi: true });
})
bulk.execute(function (err) {
resolve(predictions)
});
}
catch
(e) {
reject(e);
}
}
UPDATE: I get the following error
"errmsg": "cannot use the part (predictions of predictions.$[].status) to traverse the element ({predictions: [ { name: \"Ilker Baltaci\", userid: \"***\", userFbid: \"*****\", local_team_score: \"3\", away_team_score: \"0\", status: \"FT22\" }, { name: \"M. Mustermann\", userid: \"***\", userFbid: \"****\", status: \"FT\" } ]})",
$[] is a new feature of v3.6.
For it to work you need mongodb v3.6, and set FeatureCompatibilityVersion to "3.6".
$ updates a single element in the array.
For it to work your query should include a filter for elements in the array, e.g.
const query = {'_id': new ObjectID(currentPrediction._id), "predictions.status" : "FT"};
The $ refers to the first matching element, and without filter there are no matches.
I am using the below code to insert data to mongodb
router.post('/NewStory', function (req, res) {
var currentObject = { user: userId , story : story , _id:new ObjectID().toHexString() };
req.db.get('clnTemple').findAndModify({
query: { _id: req.body.postId },
update: { $addToSet: { Stories: currentObject } },
upsert: true
});
});
This code is working fine if i remove the _id:new ObjectID().toHexString()
What i want to achieve here is that for every new story i want a unique _id object to be attached to it
What am i doing wrong?
{
"_id": {
"$oid": "55ae24016fb73f6ac7c2d640"
},
"Name": "some name",
...... some other details
"Stories": [
{
"userId": "105304831528398207103",
"story": "some story"
},
{
"userId": "105304831528398207103",
"story": "some story"
}
]
}
This is the document model, the _id that i am trying to create is for the stories
You should not be calling .toHexString() on this as you would be getting a "string" and not an ObjectID. A string takes more space than the bytes of an ObjectId.
var async = require('async'),
mongo = require('mongodb'),
db = require('monk')('localhost/test'),
ObjectID = mongo.ObjectID;
var coll = db.get('junk');
var obj = { "_id": new ObjectID(), "name": "Bill" };
coll.findAndModify(
{ "_id": new ObjectID() },
{ "$addToSet": { "stories": obj } },
{
"upsert": true,
"new": true
},
function(err,doc) {
if (err) throw err;
console.log(doc);
}
)
So that works perfectly for me. Noting the "new" option there as well so the modified document is returned, rather than the original form of the document which is the default.
{ _id: 55c04b5b52d0ec940694f819,
stories: [ { _id: 55c04b5b52d0ec940694f818, name: 'Bill' } ] }
There is however a catch here, and that is that if you are using $addToSet and generating a new ObjectId for every item, then that new ObjectId makes everything "unique". So you would keep adding things into the "set". This may as well be $push if that is what you want to do.
So if userId and story in combination already make this "unique", then do this way instead:
coll.findAndModify(
{
"_id": docId,
"stories": {
"$not": { "$elemMatch": { "userId": userId, "story": story } }
}
},
{ "$push": {
"stories": {
"userId": userId, "story": story, "_id": new ObjectID()
}
}},
{
"new": true
},
function(err,doc) {
if (err) throw err;
console.log(doc);
}
)
So test for the presence of the unique elements in the array, and where they do not exist then append them to the array. Also noting there that you cannot do an "inequality match" on the array element while mixing with "upserts". Your test to "upsert" the document should be on the primary "_id" value only. Managing array entries and document "upserts" need to be in separate update operations. Do not try an mix the two, otherwise you will end up creating new documents when you did not intend to.
By the way, you can generate an ObjectID just using monk.
var db = monk(credentials.database);
var ObjectID = db.helper.id.ObjectID
console.log(ObjectID()) // generates an ObjectID
I've been successfully using $in in my node webservice when my mongo arrays only held ids. Here is sample data.
{
"_id": {
"$oid": "52b1a60ce4b0f819260bc6e5"
},
"title": "Sample",
"team": [
{
"$oid": "52995b263e20c94167000001"
},
{
"$oid": "529bfa36c81735b802000001"
}
],
"tasks": [
{
"task": {
"$oid": "52af197ae4b07526a3ee6017"
},
"status": 0
},
{
"task": {
"$oid": "52af197ae4b07526a3ee6017"
},
"status": 1
}
]
}
Notice that tasks is an array, but the id is nested in "task", while in teams it is on the top level. Here is where my question is.
In my Node route, this is how I typically deal with calling a array of IDs in my project, this works fine in the team example, but obviously not for my task example.
app.get('/api/tasks/project/:id', function (req, res) {
var the_id = req.params.id;
var query = req.params.query;
models.Projects.findById(the_id, null, function (data) {
models.Tasks.findAllByIds({
ids: data._doc.tasks,
query: query
}, function(items) {
console.log(items);
res.send(items);
});
});
});
That communicates with my model which has a method called findAllByIds
module.exports = function (config, mongoose) {
var _TasksSchema = new mongoose.Schema({});
var _Tasks = mongoose.model('tasks', _TasksSchema);
/*****************
* Public API
*****************/
return {
Tasks: _Tasks,
findAllByIds: function(data, callback){
var query = data.query;
_Tasks.find({_id: { $in: data.ids} }, query, function(err, doc){
callback(doc);
});
}
}
}
In this call I have $in: data.ids which works in the simple array like the "teams" example above. Once I nest my object, as with "task" sample, this does not work anymore, and I am not sure how to specify $in to look at data.ids array, but use the "task" value.
I'd like to avoid having to iterate through the data to create an array with only id, and then repopulate the other values once the data is returned, unless that is the only option.
Update
I had a thought of setting up my mongo document like this, although I'd still like to know how to do it the other way, in the event this isn't possible in the future.
"tasks": {
"status0": [
{
"$oid": "52995b263e20c94167000001"
},
{
"$oid": "529bfa36c81735b802000001"
}
],
"status1": [
{
"$oid": "52995b263e20c94167000001"
},
{
"$oid": "529bfa36c81735b802000001"
}
]
}
You can call map on the tasks array to project it into a new array with just the ObjectId values:
models.Tasks.findAllByIds({
ids: data.tasks.map(function(value) { return value.task; }),
query: query
}, function(items) { ...
Have you try the $elemMatch option in find conditions ? http://docs.mongodb.org/manual/reference/operator/query/elemMatch/