mongodb - Sort subfields with unknown parent -

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i have schema this:

{     "_id" : "555",     "connections" : [          {             "id" : 111               "time" : 1456439249         },          {             "id" : 222               "time" : 1556412345         }         ...     }     "users" : [          "111" : {             "id" : 111               "name" : "michael"         },          "222" : {             "id" : 222               "name" : "jim"         }         ... }

i want sorted connections time , users data.

i'm trying this:

db.getcollection('mycollecion')     .find(         {'_id' : '555'},         {'_id' : 0, 'connections' : 1, 'users' : 1}     ).sort({'connections.time' : 1})

probably "connections.time" not correct path, because it's array.

how can sort connections subfield "time"?

and possible in same query filter "users" appearing on connections ids?

please try through .aggregation()

> db.mycollecion.aggregate([                             {$unwind: '$connections'},                              {$sort: {'connections.time': 1}},                              {$group: {                                       _id: '$_id',                                       connections: {$push: '$connections'}                                      }                             }]);

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