Calculated group-by fields in MongoDB
- by Navin Viswanath
For this example from the MongoDB documentation, how do I write the query using MongoTemplate?
db.sales.aggregate(
[
{
$group : {
_id : { month: { $month: "$date" }, day: { $dayOfMonth: "$date" }, year: { $year: "$date" } },
totalPrice: { $sum: { $multiply: [ "$price", "$quantity" ] } },
averageQuantity: { $avg: "$quantity" },
count: { $sum: 1 }
}
}
]
)
Or in general, how do I group by a calculated field?
