Stack Overflow
Stack Overflow

Questions tagged [mongoose-populate]

The Mongoose ODM has a populate() feature which lets you reference related documents in other collections. Mongoose can populate a single document, multiple documents, plain object, multiple plain objects, or all objects returned from a query.

MongoDB 3.2+ servers include a $lookup aggregation feature which enables joining query results from multiple collections in the same database.

The Mongoose ODM provides a client-side alternative called populate(), which lets you reference related documents in other collections (including those in different databases).

Population is the process of automatically replacing the specified paths in the document with document(s) from other collection(s). Mongoose can populate a single document, multiple documents, plain object, multiple plain objects, or all objects returned from a query.

Related Links

1023 questions
2
votes
0 answers

Beginner in Mongoose: How to find if an array contains a value if I already have the document

I am trying to develop a banking website where users can apply for a loan. A single user can apply for multiple types of loans. Before a user successfully applies for a loan , I check if the user exists or not then I check all the loans for which…
catGPT
  • 417
  • 2
  • 11
2
votes
2 answers

CastError: Cast to [undefined] failed for value "[]" (type string) at path "comments.undefined"

I'm quite new to node and mongoose. I'm trying to do a project using them, but i'm running into an error while trying to populate. The comment is saved to the Comment schema perfectly, but throws an error when i reference it Organization…
Fred Kimani
  • 21
  • 1
2
votes
0 answers

Query child model with mongoose

I'm updating the mongoose version from 5 to 6 and found a change in the behavior. This is a small example: We have two models const MessageSchema = new mongoose.Schema({ text: String }); const Message = mongoose.model('Message',…
Misho Tektumanidze
  • 81
  • 6
2
votes
2 answers

Mongoose : populate after save

I have a project where I'm using the MERN stack along with Redux. When I'm fetching normal data with a get request, everything works perfectly after a clean page refresh because I can populate the query with referenced data, but when I'm saving for…
AlyaKra
  • 486
  • 8
  • 22
2
votes
2 answers

Is exexPopulate() method is deprecated from the mongoose new version?

main() const main = async () =>{ const task = await Task.findById('614ac31e103d9c5329d38686') await task.populate('owner').execPopulate() console.log(task.owner) } execPopulate() is not a function
Rohit Prajapati
  • 23
  • 3
2
votes
1 answer

$lookup : return model if reference field is not empty

I have College model which has ref :"University". each college has 1 university when the college is created. so I'm trying to get all the colleges where the uuid of the university matches the request query. So i tried the following : const…
eMan_8888
  • 95
  • 7
2
votes
1 answer

Mongoose Which one is faster .populate() or .find()

I want to get posts related to a user. which one is faster to find the User and populate posts User.findOne({ _id: id}).populate("posts") Or to search in the Posts model Directly Post.find({ owner: user_id })
Ahmad Khalafalla
  • 27
  • 1
  • 3
2
votes
1 answer

Mongoose- Search/Filter data from array into another array with the specific items

I have an mongoDB object like { "courseName" : "AI", "user" : ObjectId("6087dc4c2ba7a828363c9fca"), "questions" : [ { "optionsSet" : [ { "value" : "A", }, …
Mijanur Rahman
  • 1,094
  • 1
  • 11
  • 20
2
votes
1 answer

Mongodb: Populate based on condition

I have some collections and I am trying to transform a log object into its details (using populate). Companies (company with its users): [ { _id: "comp123", companyId: "compName123", users: [ { user:…
john remi
  • 45
  • 1
  • 4
2
votes
1 answer

why Virtual Populate not working on Node js and mongoose? Scenario : Product and Review by user

I have review and product model.If user give review on specific product(id) then it is stored in review model database but i donot like to store user review in product model database .so, i used virtual populate in product model instead of child…
Dulal Sandip
  • 91
  • 1
  • 9
2
votes
1 answer

Push data inside specific field

Can anyone tell me how I can push data inside group ? productSchema const productSchema = new mongoose.Schema({ name:{ type:String }, user:[{ author:{ type: mongoose.Schema.Types.ObjectId, …
mawerick_1
  • 103
  • 8
2
votes
2 answers

How to get count by order in mongodb aggregate?

I have two collections name listings and moods. listings sample: { "_id": ObjectId("5349b4ddd2781d08c09890f3"), "name": "Hotel Radisson Blu", "moods": [ ObjectId("507f1f77bcf86cd799439010"), …
user14016708
2
votes
1 answer

Is there an equivalent of Promise.all in mongoose query?

I looked in the docs but couldnt find it. looking for something like the following let promise = new Promise(someExecutor); let promise2 = new Promise(executor2); Promise.all([promise,promise2]).then(someFunc); let userQ = User.find(someId); let…
yojan shakya
  • 37
  • 3
2
votes
1 answer

MongoDB aggregation vs Mongoose virtuals

From this post I have understood that mongoose has created a framework around MongoDB that does some of it queries in a different way. I have read about populate virtuals. When you can use them to get your desired results, what advantages and…
YulePale
  • 6,688
  • 16
  • 46
  • 95
2
votes
1 answer

How to merge columns in Mongo

I've got this problem and I can't seem to solve it. A sample of my data: [ {'item': 'U', 'field_1': 3, 'field_2': 1, 'field_3': 1, 'field_4': 2, 'field_5': 5, : : : }, {'item': 'Y', 'field_1': 9, 'field_2': 2, 'field_3': 3, 'field_4':…
George keri
  • 61
  • 3
1 2 3
…
68 69