Lets say that i have the following objects in my mongodb-compass-database:
{
_id: ObjectID("randomString"),
Name: "Test1",
OtherAttribute: 187
},
{
_id: ObjectID("otherRandomString"),
Name: "Test2",
OtherAttribute: 1337
},
{
_id: ObjectID("otherRandomString2"),
Name: "Test1",
OtherAttribute: 23
}
How can I return the "Name"-value if it exist more than one time?
In the example I want to receive "Test1" or the whole object, doesnt matter.
I just need to see if there are any duplicates.
I need to use the MongoDB Compass Find-Input:
Is this possible?
Related
Let's say I have a MongoDB collection "people" that has the form
[
{
_id: [OBJECT_ID_1],
name: "Paul",
hobby: "rowing",
fixed: 1
},
{
_id: [OBJECT_ID_2],
name: "Selena",
hobby: "drawing",
fixed: 2
},
{
_id: [OBJECT_ID_3],
name: "Emily",
hobby: "jogging",
fixed: 3
}
]
And new data to be inserted of the form
var data = [
{
name: "Paul", // name exists, so keep "fixed" at 1
hobby: "archery",
fixed: 4
},
{
name: "Peter",
hobby: "knitting",
fixed: 5
}
]
I would like to insert/update the collection with the new data. However, if a document with the same "name" already exists, I do not want to update "fixed". The result after inserting the above data should be
[
{
_id: [OBJECT_ID_1],
name: "Paul",
hobby: "archery", // updated
fixed: 1 // not updated, because name existed
},
{
_id: [OBJECT_ID_2],
name: "Selena",
hobby: "drawing",
fixed: 2
},
{
_id: [OBJECT_ID_3],
name: "Emily",
hobby: "jogging",
fixed: 3
},
{ // newly inserted document
_id: [OBJECT_ID_4],
name: "Peter",
hobby: "knitting",
fixed: 5
}
]
The data includes a large number of documents, so I would like to achieve this in one query if possible. What would be the best way to accomplish this? Many thanks!
bulkWrite with updateOne's with $upsert:true seems to work best for you...
bulkWrite not perform a Find operation.
Its (in my case) is necessary to control if it will create a another document.
In my case I just use find check before insert/create method.
if (collection.find({"descr":descr}).limit(1).length === 1) {
//...create method
console.log('Exists')
}
I have this object in MongoDB:
{
_id: ObjectId("1"),
data: {
city: "ccp",
universities: [
{
_id: "2"
name: "universityOne"
students: []
},
{
_id: "3"
name: "universityTwo",
students: []
}
]
}
}
I need to push a Student object inside the students array inside the universityOne object inside the universities array, inside the global object.
I tried documentation and come up with this queries.
Mongo shell returns { "acknowledged" : true, "matchedCount" : 0, "modifiedCount" : 0 }. And nothing changes.
Here are the queries formatted/unformatted, so you can see them:
db.pautas.updateOne({_id: ObjectId("1")}, {$push: {"data.universities.$[id].students": {name: "aStudentName", age: 22}}}, {arrayFilters: [{"id._id": ObjectId("2")}]})
db.pautas.updateOne({_id: ObjectId("1")}, {$push: {"data.universities.$[id].students": {name: "aStudentName", age: 22}}}, {arrayFilters: [{"id._id": ObjectId("2")}]})
This second query is with the name of the university on the mongo [<identifier>]. But doesn't work either.
db.pautas.updateOne({_id: ObjectId("1")}, {$push: {"data.universities.$[name].students": {name: "aStudentName", age: 22}}}, {arrayFilters: [{"name.name": "universityOne"}]})
db.pautas.updateOne({_id: ObjectId("1")}, {$push: {"data.universities.$[name].students": {name: "aStudentName", age: 22}}}, {arrayFilters: [{"name.name": "universityOne"}]})
Regards.
UPDATE
Real object:
{
_id: ObjectId("5c6aef9bfc1a2693588827d9"),
datosAcademicos: {
internados: [
{
_id: ObjectId("5c6bfae98857df9f668ff2eb"),
pautas: []
},
{
_id: ObjectId("5c6c140f8857df9f668ff2ec"),
pautas: []
}
]
}
}
I need to add a Pauta to the pautas array. I've set pautas to an array of strings for debugging purpose, so just need to push a "hello world" or whatever string.
I tried this with the answers I've been given:
db.pautas.updateOne({"_id":ObjectId("5c6aef9bfc1a2693588827d9"), "datosAcademicos.internados._id": ObjectId("5c6bfae98857df9f668ff2eb")}, { $push: {"datosAcademicos.internados.$.pautas": "hi"}})
db.pautas.updateOne({"_id":ObjectId("5c6aef9bfc1a2693588827d9"), "datosAcademicos.internados._id": ObjectId("5c6bfae98857df9f668ff2eb")}, { $push: {"datosAcademicos.internados.$.pautas": "hi"}})
Update 2:
Mongo version: v4.0.2
Using Robo 3T.
I created a test database
And tried this command
Still not working.
There are 3 issues with your statement. First, the root ID field is "id" and you're querying the "_ID".
Second, you should put the match fields altogether. This update works as expected.
Third, you should use "$" to select the nested array position, not "$[id]".
db.pautas.updateOne(
{ "id": ObjectId("1"), "data.universities._id": "2"},
{$push:
{"data.universities.$.students": {name: "aStudentName", age: 22}}
})
Answer to the question UPDATE:
The update statement worked just fine.
Update statement
Record after update - I ran my update with your data and then the update code you posted, both worked just fine.
I have the following structure:
{
id: "1",
invoices: [{ id: "1", balance: 1},{ id: "2", balance: 1}]
},
{
id: "2",
invoices: [{ id: "3", balance: 1},{ id: "4", balance: 1}]
}
I'm getting a list of invoices IDs that i shouldn't update, the rest i need to update the balance to 0.
I'm pretty new to MongoDB and managing to find a way to do it.
Let say you want to update all invoices of id 1 except invoice.id 2 try this one:
db.collection.update(
{ id: "1", "invoices.id": {$ne: 2} },
{
$set: {
"invoices.$[]": { balance: 0 }
}
}
)
First of all, you forgot the quotes around the field names. Your documents should be like this:
{
"id": "1",
"invoices": [{
"id": "1",
"balance": 1
}, {
"id": "2",
"balance": 1
}]
}
I have limited experience with MongoDB, as I learnt it this semester at University. However, here is my solution:
db.collection.update(
{ id: "1" },
{
$set: {
"invoices.0": { id: "1", balance: 0 }
}
}
)
What does this solution do?
It takes the document with id 1. That is your first document.
The $set operator replaces the value of a field with the specified value. (straight out from the MongoDB manual - MongoDB Manual - $set operator).
"invoices.0" takes the first invoice from the invoices array and then it updates the balance to 100.
Replace the word collection from db.collection with your collection name.
Try and see if it works. If not, I'd like someone with more experience to correct me.
LE: Now it works, try and see.
In my sample document, I have a campaign document that contains the _id of the document and an importData array. importData is an array of objects containing a unique date and source value.
My goal is to have an object updated with a unique date/source pair. I would like to have the new object replace any matching object. In the example below, Fred may have originally donated a TV, but I want my application to update the object to reflect he donated both a TV and a radio.
// Events (sample document)
{
"_id" : "Junky Joe's Jubilee",
"importData" : [
{
"date": "2015-05-31",
"source": "Fred",
"items": [
{item: "TV", value: 20.00},
{item: "radio", value: 5.34}
]
},
{
"date": "2015-05-31",
"source": "Mary",
"items": [
{item: "Dresser", value: 225.00}
]
}
]
}
My original thought was to do something like the code below, but not only am I updating importData with Fred's donations, I'm also blowing away anything else in the importData array:
var collection = db.collection("events");
collection.update(
{_id: "Junky Joe's Jubilee",
importData: {
date: "2015-05-31",
source: 'Fred'
},
}, // See if we can find a campaign object with this name
{
$set:
{"importData":
{
date: "2015-05-31",
source: 'Fred',
items: [
{item: "TV", value: 20.00},
{item: "radio", value: 5.34}
]
}
}
},
{upsert: true}); // Create a document if one does not exist for this campaign
When I tried pushing (instead of $set), I was getting multiple entries for the date/source combos (e.g. Fred would appear to have donated two items multiple times on "2015-05-31").
How would I go about doing that with the MongoDB native driver and NodeJS?
Try this
var collection = db.collection("events");
collection.update(
{_id: "Junky Joe's Jubilee",
importData: {
date: "2015-05-31",
source: 'Fred'
},
}, // See if we can find a campaign object with this name
{
$set:
{"importData.$":
{
date: "2015-05-31",
source: 'Fred',
items: [
{item: "TV", value: 20.00},
{item: "radio", value: 5.34}
]
}
}
},
{upsert: true}); // Create a document if one does not exist for this campaign
According to the documentation under Array update operators this should only modify the first element in the array, which matches the query.
Lets say that I have the following document in the books collection:
{
_id:0 ,
item: "TBD",
stock: 0,
info: { publisher: "1111", pages: 430 },
tags: [ "technology", "computer" ],
ratings: [ { _id:id1, by: "ijk", rating: 4 }, {_id:id2 by: "lmn", rating: 5 } ],
reorder: false
}
I would like to update the value of ratings[k].rating and all I know is the id of the collection and the _id of the objects existing in the array ratings.
The tutorial of mongoDB has the following example that uses the position of the object inside the array but I suppose that if the update can only be done by knowing the position, this means that I firstly have to find the position and then proceed with the update? Can I do the update with only one call and if so how I can do that?
db.books.update(
{ _id: 1 },
{
$inc: { stock: 5 },
$set: {
item: "ABC123",
"info.publisher": "2222",
tags: [ "software" ],
"ratings.1": { by: "xyz", rating: 3 }
}
}
)
Sorry for late answer; I think this is what you want to do with mongoose.
Books.findOneAndUpdate({
_id: 1,
'ratings._id': id1
},
{
$set: {
'ratings.$.rating' : 3
}
}, function(err, book){
// Response
});
Positional operator may help you:
db.books.update(
// find book by `book_id` with `rating_id` specified
{ "_id": book_id, "ratings._id": rating_id },
// set new `value` for that rating
{ $set: { 'ratings.$.rating': value }}
);
$ will save position of matched document.