{username:'me', companies:{"yourcompany":{...}}
I want to insert a company into a user record (user collection), to make:
{username:'me', companies:{ "yourcompany":{...}, "mycompany":{...} }
But the name is dynamic..
var companyid = "mycompany";
.collection('users').findAndModify(
{username: usern},
[['_id', 'asc']],
{$set:{companies:{companyid: { desksmemberships:[] }}}},
{new: true}, function(){...}
Gives this.. {username:'me', companies:{ "yourcompany":{...}, "companyid":{...} }
How do I do this?
You'd have to build up your $set modifier programmatically:
var modifier = { $set: {} };
modifier.$set['companies.' + companyid] = { desksmemberships:[] };
And then use modifier as the third parameter in your findAndModify call.
You may also want to consider changing companies to be an array instead of an embedded object.
Node.js 4.x Update
You can now use the computed property syntax to do this directly in the object literal:
collection('users').findAndModify(
{username: usern},
[['_id', 'asc']],
{$set:{['companies.' + companyid]: { desksmemberships:[] }}},
{new: true},
function(){...});
I've seen this question on quite a few posts, some of them quite complex- call me crazy but you can do this (node + mongo):
My db schema 'matches' is set to an array. In the mongo data [match.matchId] becomes '2028856183'.
db.update({key: value}, {matches: [{[match.matchId] : match}] }, callback);
db.update(what to find, what to change it to, what to do next)
You can use any variable in the brackets.
Related
Hey guys i need to write a mongodb query to update a document i,e need to increment a field in docuemnt by 1, so for that i am using $inc operation but i am facing trouble in matching the document's key with the data sent by frontend
my db looks like this
_id:ObjectID("5ed4a86126663308549f816b")
title:svsbsbsssf
description:wdwwdwd
category:Object
_id:ObjectID("5ebc1144dde4f2974e209526")
label:World after Covid
category_id:1
url:world-after-covid
image:https://*****/assets/category-1590699874832.jpg
value:1
so this category is an Object and i am getting my category id from frontend, after converting that to ObjectID, i tried to match it like
let doc = await req.db
.collection("webinars")
.updateOne({category._id: categoryID }, { $inc: { listingViews: 1 } });
but the filter inside updateOne gives me error somehow the syntax isnt correct i guess
the error is like
Unexpected token, expected "," (17:26)
15 | let doc = await req.db 16 | .collection("webinars")
17 | .updateOne({category._id: categoryID }, { $inc: { listingViews: 1 } });
There is a syntax error in the updateOne filter object, the nested field path i.e category._id should be a string, something like this
// Notice the quotes around category._id
.updateOne({ "category._id": categoryID }, { $inc: { listingViews: 1 } });
I am trying to build a "number of visitors" collection in mongoDb using Node.JS backend of my website. The frontend sends the following info to Node.JS backend as JSON.
isUniqueVisitor - 1 if yes, 0 if no
country - standard country code - "JP", "IN", "UK", etc
My database looks like following
{
"today": 2019-06-07,
"uniqueVisitors": {
"count": 230,
"countries": {
"JP": 102,
"IN": 88,
"UK": 30
}
}
}
It works well if I use $inc with fixed values
Eg. $inc: {count: 1} // for string/integers keys
Eg. $inc: {"uniqueVisitors.count": 1} // inside quotes to access key of a JSON
Main issue:
I am not able to access a document name using variable.
Eg. $inc: {`uniqueVisitors.countries[${req.body.country}]`}
This creates an error as backticks can't be used for Mongo.
I tried with
Eg. $inc: {uniqueVisitors["countries"][req.body.country]}
But even this creates error.
I followed the web and found that mongo $set using variables can be realized by passing the required JSON directly to $set. Hence I resorted to code it the following way.
mongoClient.connect(mongoURL, async function (err, db) {
if (err) throw err;
console.log("Database connected");
// Identifying my document with today's date
var myQuery = {
date: getTodayDate()
};
// Defining the JSON to be passed to uniqueVisitors $inc
var uniqueVisitorsInc = {
"uniqueVisitors": {
"count": 0,
"countries": {}
}
};
// Populating the JSON to be passed to uniqueVisitors $inc => essentially asking to increase count by 1 and increase that country's count by 1
uniqueVisitorsInc["uniqueVisitors"]["count"] = 1;
uniqueVisitorsInc["uniqueVisitors"]["countries"][myData.country] = 1;
var newValues = {
$inc: uniqueVisitorsInc
};
await db.collection("visitorStats").update(myQuery, newValues, {upsert: true});
db.close();
});
The above method worked well on editor but threw the following runtime error:
$inc requires numerical values
Basically asking me to pass values to $inc in {var1: 1, var2: 5} pattern.
Please help me bypass this weird situation.
I know I can do a two step process where I read the values first, increment in variable and $set it in Mongo.
But does anyone know how to overcome this situation using $inc?
If this update were hardcoded to update "JP" only, it'd need to look like:
$inc: { "uniqueVisitors.country.JP": 1 }
So you were almost there with the backtick method but change the syntax a bit and keep the : 1 part like so:
$inc: { [`uniqueVisitors.country.${req.body.country}`]: 1 }
In the following example, assume the document is in the db.people collection.
How to remove the 3rd element of the interests array by it's index?
{
"_id" : ObjectId("4d1cb5de451600000000497a"),
"name" : "dannie",
"interests" : [
"guitar",
"programming",
"gadgets",
"reading"
]
}
This is my current solution:
var interests = db.people.findOne({"name":"dannie"}).interests;
interests.splice(2,1)
db.people.update({"name":"dannie"}, {"$set" : {"interests" : interests}});
Is there a more direct way?
There is no straight way of pulling/removing by array index. In fact, this is an open issue http://jira.mongodb.org/browse/SERVER-1014 , you may vote for it.
The workaround is using $unset and then $pull:
db.lists.update({}, {$unset : {"interests.3" : 1 }})
db.lists.update({}, {$pull : {"interests" : null}})
Update: as mentioned in some of the comments this approach is not atomic and can cause some race conditions if other clients read and/or write between the two operations. If we need the operation to be atomic, we could:
Read the document from the database
Update the document and remove the item in the array
Replace the document in the database. To ensure the document has not changed since we read it, we can use the update if current pattern described in the mongo docs
You can use $pull modifier of update operation for removing a particular element in an array. In case you provided a query will look like this:
db.people.update({"name":"dannie"}, {'$pull': {"interests": "guitar"}})
Also, you may consider using $pullAll for removing all occurrences. More about this on the official documentation page - http://www.mongodb.org/display/DOCS/Updating#Updating-%24pull
This doesn't use index as a criteria for removing an element, but still might help in cases similar to yours. IMO, using indexes for addressing elements inside an array is not very reliable since mongodb isn't consistent on an elements order as fas as I know.
in Mongodb 4.2 you can do this:
db.example.update({}, [
{$set: {field: {
$concatArrays: [
{$slice: ["$field", P]},
{$slice: ["$field", {$add: [1, P]}, {$size: "$field"}]}
]
}}}
]);
P is the index of element you want to remove from array.
If you want to remove from P till end:
db.example.update({}, [
{ $set: { field: { $slice: ["$field", 1] } } },
]);
Starting in Mongo 4.4, the $function aggregation operator allows applying a custom javascript function to implement behaviour not supported by the MongoDB Query Language.
For instance, in order to update an array by removing an element at a given index:
// { "name": "dannie", "interests": ["guitar", "programming", "gadgets", "reading"] }
db.collection.update(
{ "name": "dannie" },
[{ $set:
{ "interests":
{ $function: {
body: function(interests) { interests.splice(2, 1); return interests; },
args: ["$interests"],
lang: "js"
}}
}
}]
)
// { "name": "dannie", "interests": ["guitar", "programming", "reading"] }
$function takes 3 parameters:
body, which is the function to apply, whose parameter is the array to modify. The function here simply consists in using splice to remove 1 element at index 2.
args, which contains the fields from the record that the body function takes as parameter. In our case "$interests".
lang, which is the language in which the body function is written. Only js is currently available.
Rather than using the unset (as in the accepted answer), I solve this by setting the field to a unique value (i.e. not NULL) and then immediately pulling that value. A little safer from an asynch perspective. Here is the code:
var update = {};
var key = "ToBePulled_"+ new Date().toString();
update['feedback.'+index] = key;
Venues.update(venueId, {$set: update});
return Venues.update(venueId, {$pull: {feedback: key}});
Hopefully mongo will address this, perhaps by extending the $position modifier to support $pull as well as $push.
I would recommend using a GUID (I tend to use ObjectID) field, or an auto-incrementing field for each sub-document in the array.
With this GUID it is easy to issue a $pull and be sure that the correct one will be pulled. Same goes for other array operations.
For people who are searching an answer using mongoose with nodejs. This is how I do it.
exports.deletePregunta = function (req, res) {
let codTest = req.params.tCodigo;
let indexPregunta = req.body.pregunta; // the index that come from frontend
let inPregunta = `tPreguntas.0.pregunta.${indexPregunta}`; // my field in my db
let inOpciones = `tPreguntas.0.opciones.${indexPregunta}`; // my other field in my db
let inTipo = `tPreguntas.0.tipo.${indexPregunta}`; // my other field in my db
Test.findOneAndUpdate({ tCodigo: codTest },
{
'$unset': {
[inPregunta]: 1, // put the field with []
[inOpciones]: 1,
[inTipo]: 1
}
}).then(()=>{
Test.findOneAndUpdate({ tCodigo: codTest }, {
'$pull': {
'tPreguntas.0.pregunta': null,
'tPreguntas.0.opciones': null,
'tPreguntas.0.tipo': null
}
}).then(testModificado => {
if (!testModificado) {
res.status(404).send({ accion: 'deletePregunta', message: 'No se ha podido borrar esa pregunta ' });
} else {
res.status(200).send({ accion: 'deletePregunta', message: 'Pregunta borrada correctamente' });
}
})}).catch(err => { res.status(500).send({ accion: 'deletePregunta', message: 'error en la base de datos ' + err }); });
}
I can rewrite this answer if it dont understand very well, but I think is okay.
Hope this help you, I lost a lot of time facing this issue.
It is little bit late but some may find it useful who are using robo3t-
db.getCollection('people').update(
{"name":"dannie"},
{ $pull:
{
interests: "guitar" // you can change value to
}
},
{ multi: true }
);
If you have values something like -
property: [
{
"key" : "key1",
"value" : "value 1"
},
{
"key" : "key2",
"value" : "value 2"
},
{
"key" : "key3",
"value" : "value 3"
}
]
and you want to delete a record where the key is key3 then you can use something -
db.getCollection('people').update(
{"name":"dannie"},
{ $pull:
{
property: { key: "key3"} // you can change value to
}
},
{ multi: true }
);
The same goes for the nested property.
this can be done using $pop operator,
db.getCollection('collection_name').updateOne( {}, {$pop: {"path_to_array_object":1}})
For example, I have some documents that look like this:
{
id: 1
name: "foo"
}
And I want to append another string to the current name field value.
I tried the following using Mongoose, but it didn't work:
Model.findOneAndUpdate({ id: 1 }, { $set: { name: +"bar" } }, ...);
Edit:
From Compatibility Changes in MongoDB 3.6:
MongoDB 3.6.1 deprecates the snapshot query option.
For MMAPv1, use hint() on the { _id: 1} index instead to prevent a cursor from returning a document more than once if an intervening write operation results in a move of the document.
For other storage engines, use hint() with { $natural : 1 } instead.
Original 2017 answer:
You can't refer to the values of the document you want to update, so you will need one query to retrieve the document and another one to update it. It looks like there's a feature request for that in OPEN state since 2016.
If you have a collection with documents that look like:
{ "_id" : ObjectId("590a4aa8ff1809c94801ecd0"), "name" : "bar" }
Using the MongoDB shell, you can do something like this:
db.test.find({ name: "bar" }).snapshot().forEach((doc) => {
doc.name = "foo-" + doc.name;
db.test.save(doc);
});
The document will be updated as expected:
{ "_id" : ObjectId("590a4aa8ff1809c94801ecd0"), "name": "foo-bar" }
Note the .snapshot() call.
This ensures that the query will not return a document multiple times because an intervening write operation moves it due to the growth in document size.
Applying this to your Mongoose example, as explained in this official example:
Cat.findById(1, (err, cat) => {
if (err) return handleError(err);
cat.name = cat.name + "bar";
cat.save((err, updatedCat) => {
if (err) return handleError(err);
...
});
});
It's worth mentioning that there's a $concat operator in the aggregation framework, but unfortunately you can't use that in an update query.
Anyway, depending on what you need to do, you can use that together with the $out operator to save the results of the aggregation to a new collection.
With that same example, you will do:
db.test.aggregate([{
$match: { name: "bar" }
}, {
$project: { name: { $concat: ["foo", "-", "$name"] }}
}, {
$out: "prefixedTest"
}]);
And a new collection prefixedTest will be created with documents that look like:
{ "_id" : ObjectId("XXX"), "name": "foo-bar" }
Just as a reference, there's another interesting question about this same topic with a few answers worth reading: Update MongoDB field using value of another field
If this is still relevant, I have a solution for MongoDB 4.2.
I had the same problem where "projectDeadline" fields of my "project" documents were Array type (["2020","12","1"])
Using Robo3T, I connected to my MongoDB Atlas DB using SRV link. Then executed the following code and it worked for me.
Initial document:
{
_id : 'kjnolqnw.KANSasdasd',
someKey : 'someValue',
projectDeadline : ['2020','12','1']
}
CLI Command:
db
.getCollection('mainData')
.find({projectDeadline: {$not: {$eq: "noDeadline"}}})
.forEach((doc) => {
var deadline = doc.projectDeadline;
var deadlineDate = new Date(deadline);
db
.mainData
.updateOne({
_id: doc._id},
{"$set":
{"projectDeadline": deadlineDate}
}
)}
);
Resulting document:
{
_id : 'kjnolqnw.KANSasdasd',
someKey : 'someValue',
projectDeadline : '2020-12-01 21:00:00.000Z'
}
I'm trying to insert/update an array of strings in a mongodb document using some typescript code running in NodeJS.
The following code is typescript but I guess JS developers will get it w/o any problems:
export function addEvents(entityId: string,
events: string[] ,
callback: () => void) {
db.collection('events', function(error, eventCollection) {
if(error) {
console.error(error); return;
}
eventCollection.update({ _id: entityId }, { "$pushAll ":
{ events: events }},
function(error, result) {
if(error) {
console.error(error); return;
}
callback();
});
});
}
the document have the following structure:
{
_id : string
events : ["array","of","strings"]
}
I simply want to append an array strings at the end of the existing array for a specific _id.
I don't quite get if I should use update,save, $push ,$pushall etc.
Can someone explain?
If I understood correctly the problem is that pushAll does nothing or update returns error? Maybe copy-paste mistake in your example but I think you have typo here.
{ "$pushAll ": { events: events }}
It should be
{ $pushAll: { events: events }}
Your combination of update and $pushAll looks like the best choice for what you're doing here -- it's for appending an array to an existing array. $push is for adding an element to an array. save would involve getting the existing events array, appending to it, then saving the document.
The extra space in "$pushAll " needs to be removed. It may have quotes: "$pushAll".
Found the problem, I needed to pass "{ upsert = true }" as a third argument to the update function.
To achieve 'upsert' semantics in this case, you'd need to use $addToSet. If you have an array of values to add, you'd need to throw in the $each modifier. From mongo shell:
db.events.update(
{ _id: entityId },
{ $addToSet: { $each: events } }
)