This is my test collection
[
{
"_id": "637cbf94b4741277c3b53c6c",
"text": "outter",
"username": "test1",
"address": [
{
"text": "inner",
"username": "test2",
"_id": "637cbf94b4741277c3b53c6e"
}
],
"__v": 0
}
]
If I do
t1 = await doc.find({}, 'text').exec();
console.log(JSON.stringify(t1, null, 2));
I get
[
{
"_id": "637cbf94b4741277c3b53c6c",
"text": "outter"
}
]
So here it finds the parent text.
Question
How do I get Mongoose to query the sub document instead of the parent?
You can project the sub document(s) like this:
t1 = await doc.find({}, {'address.text':1}).exec();
See how it works on the playground example
If you only want the sub document, not even the _id of the parent:
await doc.find(
{},
{
_id: 0,
'address.text': 1
}
).exec();`
Related
If anyway to select columns from relation without using querybuilder ???
This is my current query:
const areas = await this.areaRepository.find({
where: { ...isActive },
relations: ["division"],
});
Output :
{
"id": 1,
"version": 9,
"isActive": 1,
"createdBy": null,
"updatedBy": 1,
"createAt": "2022-04-18T15:42:12.000Z",
"updatedAt": "2022-09-23T11:04:53.000Z",
"name": "Dhaka",
"division": {
"id": 3,
"version": 1,
"isActive": 1,
"createdBy": null,
"updatedBy": null,
"createAt": "2022-04-18T15:42:00.000Z",
"updatedAt": "2022-04-18T15:42:00.000Z",
"name": "Dhaka"
}
},
But is there anything like:
const areas = await this.areaRepository.find({
select: ['id','division.id division_id']
where: { ...isActive },
relations: ["division"],
});
And the output will be:
{
"id": 1,
"division_id": 3
}
This is a duplicated question of: How to select fields from joined table using TypeORM repository?
You can check the answer here. Also this depends on which TypeOrm version you are currently using, as far as I know on version under 0.3 this doesn't work.
I have the following structure of Student collection in MongoDb:
{
"_id": "st1",
"student_courses": [
{
"_id": "c1",
"course_name": "Node",
"image": [
{
"_id": "c1img1",
"image": "img1.jpeg"
}
]
},{
"_id": "c2",
"course_name": "React",
"image": [
{
"_id": "c2img2",
"image": "img2.jpeg"
}
]
}
],
}
Now, I want to update the image name of img1.jpeg in all the documents that have same image name. So what I am doing is this:
Student.updateMany(
{ "student_courses._id": "c1"},
{
$set: {
"student_courses.$.course_name": "Node Crash Course",
"student_courses.$.image[0].image": complete_image_name,
},
}
);
Unexpectedly, this is updating course_name field but image. I have tried using $ positional argument instead of [0] but got the error Too many positional arguments ...... I don't know how to do that. My expected output should look like this:
{
"_id": "st1",
"student_courses": [
{
"_id": "c1",
"course_name": "Node Crash Course",
"image": [
{
"_id": "c1img1",
"image": "complete_image_name.jpeg"
}
]
},
:::::::::::::::::::
:::::::::::::::::::
],
}
{
"_id": "st2",
"student_courses": [
{
"_id": "c1",
"course_name": "Node Crash Course",
"image": [
{
"_id": "c1img1",
"image": "complete_image_name.jpeg"
}
]
},
:::::::::::::::::::
:::::::::::::::::::
],
}
Moreover, I have implemented almost every method posted in similar questions. Thanks in advance for any help.
Try to change the way you are referring to the first element in the array:
Student.updateMany(
{ "student_courses._id": "c1"},
{
$set: {
"student_courses.$.course_name": "Node Crash Course",
"student_courses.$.image.0.image": complete_image_name,
},
}
);
I have a Json Doc which i get from my back end which looks like the one below. It has an emails Array which the doc under it has and email array. I need to get the index the email array is part of which has a match for an email address so i can update the doc. i used lodash before to search for a key in a array of docs before with _.find and _.indexOf but not sure how this would work in an Array of Array case.
{
"_type": "email_campaign",
"status": "Active",
"start_date": "04/17/2020",
"template_id": "template::0a2decdd-3acd-4661-9721-1a9ec0d039e6",
"summary": "Update",
"metrics": {
"first_email_sent": "",
"last_email_send": "2020-04-17T22:11:52.317Z",
"nbr_of_emails": 185,
"nbr_of_bounces": 1,
},
"history": {
"created_on": "04/17/2020 13:24:33",
},
"emails": [
{
"email": [
"DCustomer#gmail.com"
],
"track_request": "track_request::da07bd4b-b03e-4ecc-9d90-32e85cdb5b3a",
"tracking_nbr": "MD1dpjR6d"
},
{
"email": [
"ACustomer#matcocomponents.com",
"BCustomer#matcocomponents.com",
],
"track_request": "track_request::6f64cee1-d38e-4d68-94a2-c3c7d1287984",
"tracking_nbr": "YM1sMRX3nl"
},
{
"email": [
"ACustomer#gmail.com"
],
"track_request": "track_request::92606d4f-f9e6-457f-9156-167eb068f05b",
"tracking_nbr": "gj6dwIyHdE"
},
],
"_id": "3ed76589-4063-49f6-a21e-9ca16981d102"
}
You could use findIndex and includes:
const index = docs.emails.findIndex(item => item.email.includes('ACustomer#matcocomponents.com'))
try this:
emailToFind="xxxxxxxxx"
var indexes=[]
var test= res.emails.map((el1,i1)=>{
el.email.map((el2,i2)=>{
if (el2===emailToFind){
indexes.push(i1)
}
})
})
I am banging my head against the wall on this...
SEE UPDATE 1 (below) !
I am merging two collections together... I looked at this example ( and ~several~ other examples here on SO ... )
https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/#lookup-single-equality
I think I am really close, but my expected results are not the same as what I would expect out of the example.
Here is the schema for 'Event'
const EventSchema = new Schema({
name: {type: String, required: true},
})
Here is some 'Event' data
[
{
"_id": "5e8e4fcf781d96df5c1f5358",
"name": "358 Event"
},
{
"_id": "5e8e55c5a0f5fc1431453b5f",
"name": "b5f Event"
}
]
Here is 'MyEvent' schema:
const MyEventSchema = new Schema({
userId: {type: Schema.Types.ObjectId, required: true},
eventId: {type: Schema.Types.ObjectId, required: true},
})
Here is some 'MyEvent' data
[
{
"_id": "5e8f4ed2ddab5e3d04ff30b3",
"userId": "5e6c2dddad72870c84f8476b",
"eventId": "5e8e4fcf781d96df5c1f5358",
}
]
Here is my code ( the code is wrapped in a promise so it returns resolve and reject with data )
var agg = [
{
$lookup:
{
from: "MyEvent",
localField: "_id",
foreignField: "eventId",
as: "userIds"
}
}
];
Event.aggregate(agg)
.then( events => {
return resolve(events);
})
.catch(err => {
return reject(null);
})
Here are my results,
[
{
"_id": "5e8e4fcf781d96df5c1f5358",
"name": "358 Event",
"__v": 0,
"UserIds": []
},
{
"_id": "5e8e55c5a0f5fc1431453b5f",
"name": "b5f Event",
"__v": 0,
"UserIds": []
}
]
I expect to see UserIds filled in for event '358 Event', like this
What am I missing ???
[
{
"_id": "5e8e4fcf781d96df5c1f5358",
"name": "358 Event",
"__v": 0,
"UserIds": [
{"userId": "5e6c2dddad72870c84f8476b"}
]
},
{
"_id": "5e8e55c5a0f5fc1431453b5f",
"name": "b5f Event",
"__v": 0,
"UserIds": []
}
]
UPDATE 1
I found a mongo playground and what I have works there, but it doesn't work in my code ??
https://mongoplayground.net/p/fy-GP_yx5j7
In case the link breaks, here is configuration: * select 'bson multiple collections'
db={
"collection": [
{
"_id": "5e8e4fcf781d96df5c1f5358",
"name": "358 Event"
},
{
"_id": "5e8e55c5a0f5fc1431453b5f",
"name": "b5f Event"
}
],
"other": [
{
"_id": "5e8f4ed2ddab5e3d04ff30b3",
"userId": "5e6c2dddad72870c84f8476b",
"eventId": "5e8e4fcf781d96df5c1f5358",
}
]
}
Here is Query:
db.collection.aggregate([
{
$lookup: {
from: "other",
localField: "_id",
foreignField: "eventId",
as: "userIds"
}
}
])
Here is the result:
[
{
"_id": "5e8e4fcf781d96df5c1f5358",
"name": "358 Event",
"userIds": [
{
"_id": "5e8f4ed2ddab5e3d04ff30b3",
"eventId": "5e8e4fcf781d96df5c1f5358",
"userId": "5e6c2dddad72870c84f8476b"
}
]
},
{
"_id": "5e8e55c5a0f5fc1431453b5f",
"name": "b5f Event",
"userIds": []
}
]
any suggestions as to why this doesn't work in my code... but works in the playground?
UPDATE 2
I found this:
Need a workaround for lookup of a string to objectID foreignField
UPDATE 3
I have changed the schema to use ObjectId for ids now
still doesn't work
And they are ObjectIds :
RESOLUTION:
So the real answer was a combination of Update 2 and Update 3 and using the right collection name in the lookup.
Update 2 is pretty much my very same question... just using different table names
Update 3 is the correct way to solve this issue.
Mohammed Yousry pointed out the collection name might be wrong... so I looked at my schema and I did have it wrong - changed the name to the right name (along with ObjectId types) and it worked !
It seems there's a typo in from property in $lookup, MyEvent maybe not the collection name
db.collection.aggregate([
{
$lookup: {
from: "MyEvent", // here is the issue I think, check the collection name and make sure that it matches the one you write here
localField: "_id",
foreignField: "eventId",
as: "userIds"
}
}
])
in mongo playground you attached in the question, if you change the 'other' in the $lookup to anything else, or make a typo in it .. like others instead of other, you will face the same issue
so check that there is no typo in the word MyEvent that you populate from
I am Just trying to learn RethinkDB.I am little Bit Confused That how to delete an single Object in an array,What is the Exact query I have to use if i have to delete this Object
{
"name": "Ram" ,
"username": "B97bf210-c4d2d-11e6-b783-07b5fev048705"
}
from whoLikedIt Array
My data
{
"comments": [ ],
"id": "c242c74d-03d9-4963-9a22-4779facb8192" ,
.....
"views": 0 ,
"whoLikedIt": [
{
"name": "Vignesh Warar" ,
"username": "d97bf210-c42d-11e6-b783-07b5fe048705"
},
{
"name": "Ram" ,
"username": "B97bf210-c4d2d-11e6-b783-07b5fev048705"
},
]
.....
}
My Try
r.db('image').table('posts').get('c242c74d-03d9-4963-9a22-4779facb8192').update(
{whoLikedIt:r.row('whoLikedIt').filter({username:"B97bf210-c4d2d-11e6-b783-07b5fev048705"}).delete()}
)
Throws Me a error
e: Cannot nest writes or meta ops in stream operations. Use FOR_EACH instead in:
You want:
r.db('image').table('posts').get('c242c74d-03d9-4963-9a22-4779facb8192').update(function(row) {
return {whoLikedIt: row('whoLikedIt').filter(function(obj) {
return obj('username').ne("B97bf210-c4d2d-11e6-b783-07b5fev048705");
})};
})