node.js - How to add unique id to sub-document in a document in mongoose -

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how add unique id sub-document in document in mongoose. mongoose model sub document not adding object id.

try "new objectid()" wherever want unique id. e.g 

db.news.insert({"name":"political", "group":{"x":new objectid(),"type":"breaking"}})

i tried in mongodb 2.4.8 , working fine.


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