Mongodb- how to unwind a object not an array -

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i have collection this, need unwind "myuser" object.

{"_id" : objectid("578508630420bec15ea9876c"),    "current" : "selectcategory",    "myuser" : {     "_id" : "56c49c540d9e391243ce2752",     "myoptions" : [      {         "id" : "jobs",         "name" : "emploi"     }     ],     "mychannel" : "ussd",     "mycreatedate" : "2016-02-17t16:14:12.899z",     "myemail" : "",     "mygender" : "",     "myhidemsisdn" : "no",     "mylang" : "fr",     "mylastupdate" : "2016-02-26t11:32:29.786z",     "myyob" : -1      },     "userinput" : "continue",     "ussdsession" : "303819320" }

i'm looking output myuser :

["_id","myoptions","mychannel","mycreatedate","myemail","mygender","myhidemsisdn","mylang","mylastupdate","myyob"]

i can keys of collection.but myuser nested object has keys.thanks in advance


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