mongodb - $elemMatch (projection) returns selected array element -

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var ids = ['50478c35889a450000000001',  '50478c35889a450000000002']; var posteridarray = ['50478c35889a450000000234',  '50478c35889a450000000234'];  post.find({_id: {$in: posteridarray})   .select({ comments: { $elemmatch: {$in: ids }}})   .exec(function (err, doc) {      console.log(doc.comments); //  ['50478c35889a450000000001']      });

// note: returns 1 comment id // need find post comments restricted id , filter


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