I use Mongo 4.4 and I try to perform an update with the aggregation pipeline using updateOne that updates the nested array elements. In order to update the specific array member I use an arrayFilter in the option but for some reason, I get the error message: arrayFilters may not be specified for pipeline-style updates. The query is something like
Tag: aggregation-framework
Mongodb: How to group the result of a $lookup and map them to a list objects that contain a matching key?
I have classroom document which contain ‘modules’, the whole document looks like this: I also have assignment documents as such: My question is how could do aggregation such that if I want to do a lookup on the assignments for the classroom, I am able to group the assignment documents by moduleId and then add them as a field to
Expand a variable in a MongoDB aggregation pipeline
In a Typesctipt code, I would like to use a varible value in an aggregation pipeline in MongoDB; the problem is that the “keyToCheck” field is a variable that is set by the Typescript code and, therefore, can change based by many conditions. Is there a way to expand the variable “keyToCheck”? I have tried $$keyToCheck, $keyToCheck with no result
MongoDB get sum of fields in last stage of aggregate
I’m using an aggregate to gather some related data. The following is a sample pipeline that joins a Parent Collection to a Children One (Each Parent will have a Child). I then use a projection to gather some fields from both collections. This includes getting a count of the “number of sodas” a child has. Ultimately, I’m aiming to get
join object from another documnt with localfield key
i have a competition doc with field teams array of object with _id of team and a score doc with teamId field competitions.teams = [{_id: 100,..}, {..}] score.teamId = 100 when aggregatig score i want to group it to the competition teams but imm getting all team inside the group innstead of matching id sample document https://mongoplayground.net/p/yJ34IBnnuf5 returns all team
Add the sum of two fields to a new field in the document
I would like to calculate sum of two fields, then create new field in document something like: ‘totalSum’. But I dont know how to do this. All in mongodb. Here’s an example: Answer Demo – https://mongoplayground.net/p/40DnYmMnEyU Use $addFields to add new fileds total, compute values using $add Output
Is there a way to search through embedded arrays using aggregate pipeline in MongoDB?
I need to search through all the arrays within the categories field to find if the product belongs in the ‘T-Shirt’ category, is there a way to search through all the arrays within the category field? Any help would be appreciated. Here is what I have tried so far Here is an example of one of the documents: Answer Sure.
Filtering, mapping and sorting documents in aggregation pipeline
Lets say I have an aggregation pipeline, and I am being able to get the required details as needed but I need to sort values of key named visits in descending order and then cherry pick items in it. Sample response Now, what I am looking for is to arrange the visits field in descending order based on _id. And
How to group by sub documents and get unique value of value field?
This is my database collection: Now I want to send the data of only the attribute where isVariation is not 0. Also I want to send the variant values of each attribute where isComplete =1. Hence the result should look like this The above result does not have value of 2.5 inch as the isComplete is 0 for this document.
How to return the variant values of each product if that product is a variant?
I have a database in MongoDB like this Now I want to return data where 500 GB has been in productId 1 and 3 The response should be like this: I have the possible values that I store in another collection for variantPossible values. The values that i am storing are like this: I want to return the variant values