I am new to Node.js and mongoose. I have tried a lot of things but not able to get the result I want.
Can someone help who knows how, who has faced this problem before or knows the solution of that problem?
Below is my database screen where 3 records are insured like below.
I have written this code and it returns the result shown below:
router.get("/categoryFields", async (request, response) => {
const categories = await categoryModel.find({}).select("parentId title slug");
try {
response.send(categories);
} catch (error) {
response.status(500).send(error);
}
});
JSON result =>
[
{
"_id": "61779e5c1e4ed11e96301ccd",
"title": "Clothing",
"slug": "hello"
},
{
"_id": "61779e8d1e4ed11e96301ccf",
"parentId": "61779e5c1e4ed11e96301ccd",
"title": "Shoe",
"slug": ""
},
{
"_id": "6177c1cd6d3e170ae58c89c3",
"title": "Electric",
"slug": ""
}
]
But I need to get a result like this - I want parentID in every object:
[
{
"_id": "61779e5c1e4ed11e96301ccd",
"parentId": "",
"title": "Clothing",
"slug": "hello"
},
{
"_id": "61779e8d1e4ed11e96301ccf",
"parentId": "61779e5c1e4ed11e96301ccd",
"title": "Shoe",
"slug": ""
},
{
"_id": "6177c1cd6d3e170ae58c89c3",
"parentId": "",
"title": "Electric",
"slug": ""
}
]
Please can anyone help me how to do this in mongoose?
db.collection.find({},
{
"parentId": {
$cond: {
if: "$parentId",
then: "$parentId",
else: ""
}
},
"title": 1,
"slug": 1
})
Test Here
Related
{
"name": "user2",
"avatar": 1,
"email": "example#gmail.com",
"categories": [
{
"cname": "Category 1",
"list": [
{
"status": "pending",
"name": "List Item 1"
},
{
"status": "pending",
"name": "List Item 2"
}
]
}
]
}
I want to update "categories.list.status" = "pending" to "completed". How can I do it? I tried using positional operator($) but it is giving error too many positional operator.
If you are using Mongoose (as your tags suggest), you can just update the value in the document object and then save it
document.list[0].status = "completed";
document.save();
I tried this. It worked.
document.updateOne({_id: id}, {
{
$set: {
"categories.$[].list.$[ele].status" : status
}
},
{
arrayFilters: [{"ele.name" : name}]
}
}
Here is my mongo schema:
{
"_id": ObjectId("5f8af2fc5f23667adf3bbaf2"),
"score": 2.5,
"questions": [{
"_id": ObjectId("5f8af30d5f23667adf3bbaf5"),
"desc": "some text",
},
{
"_id": ObjectId("5f8af3115f23667adf3bbaf8"),
"desc": "some text",
"options": [{
"_id": ObjectId("5f8af3115f23667adf3bbaf9"),
"name": "some name",
"desc": "description 1"
},
{
"_id": ObjectId("5f8af3115f23667adf3bbafa"),
"name": "some name",
"desc": "description 2"
}
]
}
]
}
I've to update the name and desc of the option having id as 5f8af3115f23667adf3bbaf9 which is in the one of the array elements of the question attribute having id as 5f8af30d5f23667adf3bbaf5 which is again part of the data having id as 5f8af2fc5f23667adf3bbaf2
Tried the following query which is getting executed successfully but not updating the option:
Model.findOneAndUpdate({
_id : ObjectId("5f8af2fc5f23667adf3bbaf2"),
"questions._id": ObjectId("5f8af30d5f23667adf3bbaf5"),
"questions.options._id": ObjectId("5f8af3115f23667adf3bbaf9"),
}, {
$set: {
"questions.$[q].options.$[o].order": data.order,
"questions.$[q].options.$[o].definition": data.definition,
"questions.$[q].options.$[o].type": data.type,
},
},
{
arrayFilters: [{ "q._id": ObjectId(qid) }, { "o._id": ObjectId(oid) }]
})
Is tihs possible to do in a single mongoose findOneAndUpdate method?
Your query is correct, I have just hardcoded object id values in array filter and it is updating the documents. I have updated name and desc as u said. Do try this out. One more thing in mongoose u have to specify the object id as "mongoose.Types.ObjectId".
Therefore in your case it would be like "q._id": mongoose.Types.ObjectId("5f8af3115f23667adf3bbaf8").
And one more thing is that you are using findAndUpdate, try using update only depending on your mongoose version
Here is mongoplayground:
https://mongoplayground.net/p/TP5iCTAC5R_
Query:
db.collection.update({
_id: ObjectId("5f8af2fc5f23667adf3bbaf2"),
"questions._id": ObjectId("5f8af3115f23667adf3bbaf8"),
"questions.options._id": ObjectId("5f8af3115f23667adf3bbaf9")
},
{
$set: {
"questions.$[q].options.$[o].name": "anotherName",
"questions.$[q].options.$[o].desc": "anotherDesc"
}
},
{
arrayFilters: [
{
"q._id": ObjectId("5f8af3115f23667adf3bbaf8")
},
{
"o._id": ObjectId("5f8af3115f23667adf3bbaf9")
}
]
})
Output :
[
{
"_id": ObjectId("5f8af2fc5f23667adf3bbaf2"),
"questions": [
{
"_id": ObjectId("5f8af30d5f23667adf3bbaf5"),
"desc": "some text"
},
{
"_id": ObjectId("5f8af3115f23667adf3bbaf8"),
"desc": "some text",
"options": [
{
"_id": ObjectId("5f8af3115f23667adf3bbaf9"),
"desc": "anotherDesc",
"name": "anotherName"
},
{
"_id": ObjectId("5f8af3115f23667adf3bbafa"),
"desc": "description 2",
"name": "some name"
}
]
}
],
"score": 2.5
}
]
I want add new data my nested array
My document is:
{
"username": "erkin",
"email": "erkin-07#hotmail.com",
"password": "b",
"playlists": [
{
"_id": 58,
"name": "asdsa",
"date": "09-01-15",
"musics": [
{
"name": "INNA - Cola Song (feat. J Balvin)",
"duration": "3.00"
},
{
"name": "blabla",
"duration": "3.00"
}
]
}
]
}
I want add music in this playlist section:
{
"username": "erkin",
"email": "erkin-07#hotmail.com",
"password": "b",
"playlists": [
{
"_id": 58,
"name": "asdsa",
"date": "09-01-15",
"musics": [
{
"name": "INNA - Cola Song (feat. J Balvin)",
"duration": "3.00"
},
{
"name": "blabla",
"duration": "3.00"
},
{
"name": "new",
"duration": "3.00"
}
]
}
]
}
Here is what I tried:
$users->update(
array(
'_id' => new MongoId (Session::get('id')),
'playlists._id' => $playlistId
),
array(
'$push' => array('playlists.musics' => array(
'name' => 'newrecord',
'duration' => '3.00'
))
)
);
Probably something like this where ID is your ObjectId. The first {} are necessary to identify your document. It is not required to use an ObjectId as long as you have another unique identifier in your collection.
db.collection.update(
{ "_id": ID, "playlists._id": "58"},
{ "$push":
{"playlists.$.musics":
{
"name": "test name",
"duration": "4.00"
}
}
}
)
This way it worked for me!
"playlists.$[].musics":
db.collection.update(
{ "_id": ID, "playlists._id": "58"},
{ "$push":
{"playlists.$[].musics":
{
"name": "test name",
"duration": "4.00"
}
}
}
)
https://docs.mongodb.com/manual/reference/operator/update/positional-filtered/#position-nested-arrays-filtered
I suggest you using arrayFilters since it supports multiple nested documents and clearer.
db.collection.update(
{ "_id": ID},
{ "$push":
{"playlists.$[i].musics":
{
"name": "test name",
"duration": "4.00"
}
}
},
{
arrayFilters: [
{'i._id': 58,},
],
},
)
2022 update:
Full snippet:
from pymongo import MongoClient
client = MongoClient('mongodb://localhost:27017/', maxPoolSize=50)
db = client.name_of_db
collection = db["name_of_collection"]
To push:
collection.find_one_and_update(
{"_id": 'id_of_the_document'},
{"$push": {"key":"value"}})
To push into nested:
collection.find_one_and_update(
{"_id": 'id_of_the_document'},
{"$push": {"key.nested_key":"value"}})
i'm new to MongoDB & Mongoose
I have data like this:
{
"_id": "5787009e494495e56d327417",
"title": "Hahaha",
"parent": null,
"depth": 0
},
{
"_id": "5787009e494495e56d327416",
"title": "Hihihi",
"parent": null,
"depth": 0
},
{
"_id": "5787009e494495e56d327415",
"title": "Huhuhu",
"parent": "5787009e494495e56d327417",
"depth": 1
}
How can I convert the data into this:
{
"_id": "5787009e494495e56d327417",
"title": "Hahaha",
"children": [
"_id": "5787009e494495e56d327415",
"title": "Huhuhu",
"children": []
]
},
{
"_id": "5787009e494495e56d327416",
"title": "Hihihi",
"children": []
}
Please help me, and sorry for my bad english !
There is no other way you have to traverse the result and create new Data in memory.
//for each item in the result {
if(item.parent !=null){
insert_item_in_tree(item);
}
//}
then build a data structure function to insert the one item appropriately as per parent id.
What I am trying to do is the following.
I have objects that could live in multiple documents, and although I am not sure if this is best practice, I am using their ObjectId as pointers.
Document A
{
"_id": {
"$oid": "51a02dade4b02780aeee5ab7"
},
"title": "My Document A",
"artifacts": [
"51a81d8ee4b084336fea2d33",
"asdfsdfe4b084336fea2d33"
]
}
Document B
{
"_id": {
"$oid": "51a02dade4b02780aeee5ab7"
},
"title": "My Document A",
"artifacts": [
"51a81d8ee4b084336fea2d33",
"123454b084336fea2d33"
]
}
The individual artifact looks something like. If this artifact changes then there is no need to update the documents that it lives in:
{
"_id": {
"$oid": "51a81d8ee4b084336fea2d33"
},
"title": "Artifact A",
"media": {
"player": "video",
"source": "http://www.youtube.com/watch?v=12334456"
}
}
What I'd like to do, is get an expanded list of all the artifacts shown in either doc A or doc B in an array something like:
[{
"_id": {
"$oid": "51a81d8ee4b084336fea2d33"
},
"title": "Artifact A",
"media": {
"player": "video",
"source": "http://www.youtube.com/watch?v=12334456"
}
},
{
"_id": {
"$oid": "123455e4b084336fea2d33"
},
"title": "Artifact B",
"media": {
"player": "video",
"source": "http://www.youtube.com/watch?v=12334456"
}
}]
The way I have done it in the past is by POSTing from client a list of Ids and then using
{_id: { $in: userQuestArray} }
but if i am constantly posting back to node from the client it seems a bit inefficient. Especially if the array I am posting is hundreds of items long.
Mongoose provide you a feature population which exactly does the same thing you are looking for http://mongoosejs.com/docs/populate.html. In your case what you need to do is
var mongoose = require('mongoose')
, Schema = mongoose.Schema
var tempSchema = Schema({
title : String,
artifacts : [{ type: Schema.Types.ObjectId, ref: 'Artifacts' }]
});
var artifactsSchema = Schema({
title : String,
media : { player: String, source: String, }
});
var tempModel = mongoose.model('Temp', tempSchema);
var artifactsModel = mongoose.model('Artifacts', artifactsSchema);
Now whenever artifacts documents gets created you need to push that in respective temp dcoument artifacts array as shown in mongoose documentation. You can retrive it like that
tempModel
.find(query)
.populate('artifacts')
.exec(function (err, results) {
if (err)
console.log(err);
console.log(results);
})
//results contains data in form shown below
[{
"_id": {
"$oid": "51a02dade4b02780aeee5ab7"
},
"title": "My Document A",
"artifacts": [{
"_id": {
"$oid": "51a81d8ee4b084336fea2d33"
},
"title": "Artifact A",
"media": {
"player": "video",
"source": "http://www.youtube.com/watch?v=12334456"
}
},
{
"_id": {
"$oid": "123455e4b084336fea2d33"
},
"title": "Artifact B",
"media": {
"player": "video",
"source": "http://www.youtube.com/watch?v=12334456"
}
}]
}]