How to sort sub-documents in the array field?

Question

I\'m using the MongoDB shell to fetch some results, ordered. Here\'s a sampler,

{
\"_id\" : \"32022\",
\"topics\" : [
    {
        \"weight\" : 281.58551703         


        

Answer 1

If you don't want to update but only get documents, you can use the following query

 db.test.aggregate(
 [
   {$unwind : "$topics"},
   {$sort : {"topics.weight":-1}},
   {"$group": {"_id": "$_id", "topics": {"$push": "$topics"}}}
 ]
)