How can I create unique IDs for embedded documents in MongoDB?

Question

So I need to reference particular subdocuments uniquely from items in my collection. For instance:

User = {
    \'name\': \'jim\',
    \'documents: [
        {\         


        

Answer 1

And here's how to do it in Clojure, assuming the use of congomongo:

(import org.bson.types.ObjectId)
(str (ObjectId.)) ; => "12345xxxxx"