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 $elemMatch option in find conditions ? http://docs.mongodb.org/manual/reference/operator/query/elemMatch/
Related
I have collection with name products with almost 100k documents. I want to introduce a new key called secondaryKey with unique value uuid in all the documents.
I do this using nodejs.
Problem I am facing:-
When I try the below query,
db.collection('products').updateMany({},{"$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 a document with the array of objects and one object contains multiple objects I want to update inner object with $set but didn't get any luck.
can anybody give me any hint so that I can resolve it?.
This is my object:
{
"_id": ObjectId("56fbfafdf86fa6161911d104"),
"site": "xyz",
"adsPerCategory": NumberInt(2),
"sampledAt": ISODate("2016-03-30T16:12:45.138+0000"),
"items": [
{
"id": "4563873",
"content": {
"title": "WATER DISTILLERS",
"body": "Perfect to save money.",
}
},
{
"id": "4563s23232873",
"content": {
"title": "Cola water",
"body": "Perfect for body.",
}
}
]
}
I want to update body.
for now, I have given single object but it can be multiple.
Here what I tried
models.Sample.update(
{
_id: samples._id
},
'$set': {
'items.0.content.body': body.description
},
function(err, numAffected) {
console.log(err);
console.log('Affected....', numAffected);
}
);
It's working fine if I put 0 but I want to make it dynamic.
Like 'items.index.content.body': body.description
Thank You.
I think you can do something like this.
models.Sample.find({ _id: ObjectId(samples._id) })
.forEach(function (doc) {
doc.items.forEach(function (element, index, array) {
items[index].content.body = body.description;
});
models.Sample.save(doc);
});
I want to update multiple docs with different values.
My Database looks something like this.
[
{
"_id": 1,
"value": 50
},
{
"_id": 2,
"value": 100
}
]
This Query return an error because i'm passing an array instead of an object in the $set.
Model.update({_id: {$in: ids}}, {$set: ids.value}, {multi: true};
I want my database to look like this
[
{
"_id": 1,
"value": 4
},
{
"_id": 2,
"value": 27
}
]
Supposing you had an array of objects that you wanted to update in your collection on matching ids like
var soldItems = [
{
"_id": 1,
"value": 4
},
{
"_id": 2,
"value": 27
}
];
then you could use the forEach() method on the array to iterate it and update your collection:
soldItems.forEach(function(item)){
Model.update({"_id": item._id}, {"$set": {"value": item.value }}, callback);
});
or use promises as
var updates = [];
soldItems.forEach(function(item)){
var updatePromise = Model.update({"_id": item._id}, {"$set": {"value": item.value }});
updates.push(updatePromise);
});
Promise.all(updates).then(function(results){
console.log(results);
});
or using map()
var updates = soldItems.map(function(item)){
return Model.update({"_id": item._id}, {"$set": {"value": item.value }});
});
Promise.all(updates).then(function(results){
console.log(results);
});
For larger arrays, you could take advantage of using a bulk write API for better performance. For Mongoose versions >=4.3.0 which support MongoDB Server 3.2.x,
you can use bulkWrite() for updates. The following example shows how you can go about this:
var bulkUpdateCallback = function(err, r){
console.log(r.matchedCount);
console.log(r.modifiedCount);
}
// Initialise the bulk operations array
var bulkOps = soldItems.map(function (item) {
return {
"updateOne": {
"filter": { "_id": item._id } ,
"update": { "$set": { "value": item.value } }
}
}
});
// Get the underlying collection via the native node.js driver collection object
Model.collection.bulkWrite(bulkOps, { "ordered": true, w: 1 }, bulkUpdateCallback);
For Mongoose versions ~3.8.8, ~3.8.22, 4.x which support MongoDB Server >=2.6.x, you could use the Bulk API as follows
var bulk = Model.collection.initializeOrderedBulkOp(),
counter = 0;
soldItems.forEach(function(item) {
bulk.find({ "_id": item._id }).updateOne({
"$set": { "value": item.value }
});
counter++;
if (counter % 500 == 0) {
bulk.execute(function(err, r) {
// do something with the result
bulk = Model.collection.initializeOrderedBulkOp();
counter = 0;
});
}
});
// Catch any docs in the queue under or over the 500's
if (counter > 0) {
bulk.execute(function(err,result) {
// do something with the result here
});
}
First of all your update() query is not ok..
See documentation for this here
Model.update(conditions, update, options, callback);
Suppose your current db model contains docs like this (as you described in question as well):
[
{
"_id": 1,
"value": 50
},
{
"_id": 2,
"value": 100
}
];
and you've below array which contains objects (i.e., docs) to be modified with current db's docs to like this:
idsArray: [
{
"_id": 1,
"value": 4
},
{
"_id": 2,
"value": 27
}
];
From my experience with mongodb & mongoose, i don't think you can update all docs with single line query (that's you're trying to do).. (P.S. I don't know about that so I am not sure to this..)
But to make your code work, you will be doing something like this:
Idea: Loop over each doc in docs i.e, idsArray and call update() over it..
So, Here's code to this:
idsArray.forEach(function(obj) {
Model.update({_id: obj._id}, {$set: {value: obj.value}});
});
In above code, I am supposing you've _id values in db docs as they 're written above (i.e, "_id": 1).. But if they're like this "_id": ObjectId('1')
[
{
"_id": ObjectId('1'),
"value": 50
},
.....
.....
]
then you'll be need to convert _id to ObjectId(obj._id) in update() query..
so for that you'll be doing like this.
var ObjectId = require('mongodb').ObjectID;
idsArray.forEach(function(obj) {
Model.update({_id: ObjectId(obj._id)}, {$set: {value: obj.value}});
});
P.S. Just confirm it (i.e., _id) before go forward..
Hope this helps.
Cheers,
Multi update can be used only for updating multiple documents to the same value(s) or updating with the same update operation for all documents.
If you want to update to different values you have to use several update statements.
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 am using mongoose ODM for a application. I am trying to count the number of items returned by a model like this:
app.post("/verifyLogin",function(request,response){
var usr=request.body.username;
var pass=request.body.password;
response.send(userModel.find({$and:[{username:"admin"},{password:"admin"}]}).count());
});
But i get in return:
{
"options": {
"populate": {}
},
"_conditions": {
"$and": [
{
"username": "admin"
},
{
"password": "admin"
}
]
},
"_updateArg": {},
"op": "count"
}
I expected a number :(
One way of doing this is to use Model.count method, in your case:
userModel.count({$and:[{username:"admin"},{password:"admin"}]}, function(err, result) {
if (err) {
//handle errors
} else {
response.send({count :result});
}
});
Also: you're in node.js world - use callbacks.
The result you're getting now is the result of the count call on the Model.find() result (which, i think, is a query object), not the count of the query results.