java - Spring Data equivalent of aggregation query -

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i'm having hard time figuring out how write spring data implementation below aggregation query. background of problem can found here 

db.asset.aggregate([{$unwind:"$folderids"},  {$group:{_id: "$folderids",assets:{$push: {assets_id:"$_id",display_name:"$displayname"}}}}])

i have got below piece of code far

aggregationoperation unwind = aggregation.unwind("folderids"); aggregationoperation groupfolderids = aggregation.group("folderids")             .push(new basicdbobject().put("assetid", "$_id")).as("assets"); aggregation aggregation = aggregation.newaggregation(unwind, groupfolderids); aggregationresults<map> results = mongotemplate.aggregate(aggregation, "asset", map.class);

i know argument .push() has fixed don't know how. extract few fields asset document in result. appreciated. thank you.

if supplying basicdbobject $push use .append method add additional fields:

    aggregation aggregation = newaggregation(             unwind("folderids"),             group("folderids")                 .push(                     new basicdbobject("assets_id","$_id")                      .append("display_name","$displayname")                 ).as("assets")     );

also note when using "typed" output, class type use must match structure of "output" , not "input" class being used of course different.


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