MongoDB – Overwrite the whole array field instead of its item
I have this schema:{ key: [] }. I want to convert it to { key: { foo: number } }. This is the query I came up with: db.collection.update({}, [ { "$set": { key: { foo: 43 } } }…
MongoDB Add Array Element with Virtual Order
Does anyone know how to add an array element to a mongodb array and set a "virtual" order to the size of the array, all in an atomic operation? So, something like: db.users.updateOne( { _id: 1}, { $addToSet: { images:…
Preserve all groups generate by first $group when using the second $group in MongoDB aggregation
I have one collection that the structure of the record look like this, { _id: ObjectId('66a544dc3a8dff9aaaf65343'), user_type: "USER", status: CREATE } The explanation of each field: _id : ID generate by MongoDB user_type : the record's user type . Can…
MongoDB aggregate merge condition
I have this below collection and I use MongoDB aggregation to acheive an output(where I aggregate all order line items for an order) and trying to merge into another collection(order). [ { "order_line_item_id": 1, "order_id": 100, "products": [ { "name":…
How to convert a positive integer to binary inside mongoDB aggregation
I was looking for a way to convert a positive integer into a binary array inside a mongoDB aggregation pipeline. There is $bit operation which can't be used inside an aggregation pipeline. This question is regarding mongoDB version 6.0 and…
Aggregator Query for complex mongoDB Structure
`I am trying to write an aggregator query for the complex DB document below, ideally i am looking for creating multiple streams from the given activities set, identifying the parent child hierarchy and recursively processing the input document. Title: Aggregator…
MongoDB run loop to add incremental index value in array
I have a MongoDB collection where I have an array of objects and I want to add an incremental index value to each element of the array of objects. Like index starts from 0 to array length - 1. db.collection.aggregate([…
MongoDb $lookup through array and aggregate
Below are two collections orders and amounts. I have array of lookup data which is to be added using $addFields in orders aggregate pipeline and iterated and get total amount sum from amounts collections. db={ "orders": [ { "_id": 1,…
MongoDB aggregation: Only keep the running total for the last item in the partition
I have a data like: [ { "grp": "A", "seq": 1, "score": 1, x: 0 }, { "grp": "A", "seq": 1, "score": 2, x: 0 }, { "grp": "A", "seq": 1, "score": 3, x: 0 }, { "grp": "A", "seq":…
Is it possible to create and update documents in MongoDB with an aggregation?
I have a database with data like this: [{ "_id": { "$oid": "664baf560b9539e48fbc6ed1" }, "name": "first assignment", "next": { "$oid": "664baf620b9539e48fbc6ed2" }, "preview": null, "date": { "$date": "2024-04-20T10:00:00.000Z" } }, { "_id": { "$oid": "664baf620b9539e48fbc6ed2" }, "name": "second assignment", "next":…