mongodb match multiple nested
// Use $elemMatch
Model.findOne({
views: {
$elemMatch: {
year: 2012,
month: 6
}
}
}, {
'views.$': 1
})mongodb match multiple nested
// Use $elemMatch
Model.findOne({
views: {
$elemMatch: {
year: 2012,
month: 6
}
}
}, {
'views.$': 1
})mongodb aggregate over nested fields
> db.demo99.aggregate([ { $project: { Count: { $objectToArray: "$Details" } } }, { $unwind: "$Count" }, { $group: { _id: "$Count.k", count: { $sum: "$Count.v.Number"} } } ])Copyright © 2021 Codeinu
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