doctrine2 - MongoDB - find ids of documents with the highest value in a group -

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assume following collection:

_id:1, humanid:a, value:10 _id:2, humanid:a, value:20 _id:3, humanid:b, value:33

question:

what easiest way find ids of documents have highest value when grouped humanid, i.e. output [2, 3].

bonus question:

can done using doctrine odm query builder?


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