Select sub-documents where field's value is in an some array

Question

I want to filter according the sub documents, but actually I am repeating the document for each sub document. I want one document and a list of sub documents if that is the case

Answer 1

You just need to add $group & $push. First you $unwind the subdocs to apply the $match followed by $group on id and $push the grouped subdocs.

db.ftmp.aggregate({
    $unwind: "$subdocs"
}, {
    $match: {
        "subdocs.desc": {
            $in: ["000", "011"]
        }
    }
}, {
    $group: {
        _id: "$_id",
        subdocs: {
            $push: "$subdocs"
        },
        filename: {
            $first: "$filename"
        },
        cod: {
            $first: "$cod"
        }
    }
})