Return only specific fields from projection array sub-document

Question

I\'m looking at MongoDB\'s documentation on the $ and $elemMatch projections. I\'m trying to figure out how to return only a subset of a projection array\'s fields, but I canno

Answer 1

Are you specifically trying to do this without using aggregate?

db.test.aggregate([{$unwind:"$array"},
                   {$match:{"array.key":1}},
                   {$project:{"array.name":1, extra:1}}])