Document layout
{
"_id": "5a21c5dff772de0555480ef5",
"date": "2017-10-06T00:00:00.000Z",
"amount": 1,
"location": "Canada",
"__v": 0
}
I am looking to calculate the total amount for each location and present the output in the following format:
{
"location": "Canada",
"amount": 8
}
Could you provide some guidance on how to construct an aggregate query for this purpose (or suggest an alternative approach)?
If you're looking to group and summarize data in MongoDB, the aggregation framework is your friend.
You can achieve this by using the $group stage along with the $sum operator to aggregate documents based on location:
db.collection.aggregate([{$group:{_id:"$location", totalAmount: {$sum: "$amount"}}])
If you need the resulting field to be named 'location', add a $project stage to rename '_id' to 'location':
db.collection.aggregate([
{$group:{_id:"$location", totalAmount: {$sum: "$amount"}}},
{$project: {location: "$_id", totalAmount: 1, _id:0}}
])
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