I have activities that I should add to mongodb, activities have, dates and times, I should sort them, What I want, is not to have another field for timestamp and index that field also, I don't want the time when the document is created, I want to embed that activitie's timestamp to mongoid, I searched and tried this one but did not work,
"_id" => new MongoId($stamp)
Is there a chance, that I can embed future timestamp to mongoid ? thank you :)