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mongodbgomongo-go

Return single document in mongo aggregation in Go driver

I am using official mongo driver for Golang: go.mongodb.org/mongo-driver/mongo

Preface In this driver, I could not found any method for returning one single object from aggregation query. driver aggregation documentation

Problem The problem I am facing with this is if I have some documents which should be filtered and only first one should be returned, then I forcefully need to get all documents and return document on 0 index. In my knowledge, this is not optimized.
I have only one method for aggregation here, which returns cursor of multiple objects:

Is it possible to get single object in aggregation in this driver ?

Solution

  • Aggregation always returns a list of documents, but you may use the $limit stage to only return one document.

    bson.M{"$limit": 1}