След коментар на прасад, аз реших проблема си с това решение.
type Example struct {}
var exm []Example
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
pipeline := []bson.M{
{"$match": bson.M{"status": "Pending"}},
{"$group": bson.M{"_id": "$batch"}},
}
cursor, err := db.Collection("xyzcollection").Aggregate(ctx, pipeline)
if err != nil {
return []Example{}, errors.New(fmt.Sprintf("unable to retrive data: %s ", err.Error()))
}
var result Example
for cursor.Next(ctx) {
cursor.Decode(&result)
exm = append(exm, result)
}
return exm, nil