MongoDB Use $group for the subset after $group - mongodb

Question

I just learned mongoDB, I am trying to find some repeat customer info through my customer database.
The sample collection:
{
"_id" : ObjectId("5b7617e48146d8bae"),
"amazon_id" : "112",
"date" : "2018-01-25T18:40:55-08:00",
"email" : "xxxxx#marketplace.amazon.com",
"buy_name" : "xxxxx",
"sku" : "NPC-50",
"qty" : 8,
"price" : 215.92,
"reci_name" : "XXXXX",
"street1" : "XXXXX",
"street2" : "",
"street3" : "",
"city" : "XXXXX",
"state" : "XXXXX",
"zip_code" : "XXXXXX"
}
{
"_id" : ObjectId("5b761712e48146d8bae"),
"amazon_id" : "114",
"date" : "2018-01-27T18:40:55-08:00",
"email" : "xxxxx#marketplace.amazon.com",
"buy_name" : "xxxxx",
"sku" : "ABC",
"qty" : 1,
"price" : 19.99,
"reci_name" : "XXXXX",
"street1" : "XXXXX",
"street2" : "",
"street3" : "",
"city" : "XXXXX",
"state" : "XXXXX",
"zip_code" : "XXXXXX"
}
I group all customer info by their email id, and here is my code:
db.getCollection('order').aggregate([
{ $group: { _id: "$email",
OrderInfo: {$push: {orderId: "$amazon_id", sku: "$sku", qty: "$qty", price:"$price"
}},
CustomerInfo: {$addToSet: {buyName: "$buy_name",reName: "$reci_name", email: "$email", street1: "$street1",
street2: "$street2", city: "$city", state: "$state", zipCode: "$zip_code"} }
}},
{ $project: {_id: 1, OrderInfo: 1, CustomerInfo:1, total_price:{$sum: "$OrderInfo.price"} }},
{ $match: {total_price: {$gt:100} } },
{ $sort: {total_price:-1}},
], { allowDiskUse: true } );
It shows me the result:
{
"_id" : "xxxxxxx#marketplace.amazon.com",
"OrderInfo" : [
{
"orderId" : "112",
"sku" : "NPC-50",
"qty" : 8,
"price" : 215.92
},
{
"orderId" : "112",
"sku" : "NPC-50",
"qty" : 1,
"price" : 26.99
},
{
"orderId" : "114",
"sku" : "NPC-50",
"qty" : 1,
"price" : 26.99
},
{
"orderId" : "114",
"sku" : "ABC",
"qty" : 1,
"price" : 19.99
},
{
"orderId" : "116",
"sku" : "ABC",
"qty" : 1,
"price" : 19.99
},
],
"CustomerInfo" : [
{
"buyName" : "xxxxxxxxx",
"reName" : "xxxxxxxxxxxx",
"email" : "xxxxxxxxxxxx#marketplace.amazon.com",
"street1" : "xxxxxxxxxxx",
"street2" : "",
"city" : "xxxxxxxxxx",
"state" : "xxxxxxxxxxxx",
"zipCode" : "xxxxxxxxxx"
},
{
"buyName" : "xxxxxxxxxx",
"reName" : "xxxxxx",
"email" : "xxxxxxxx#marketplace.amazon.com",
"street1" : "xxxxxxxxxxx",
"street2" : "",
"city" : "xxxxx",
"state" : "xxxx",
"zipCode" : "xxxxxxxx"
}
],
"total_price" : 309.88
}
However, I want to group the sku and sum up the qty and price in the OrderInfo Set. My expected output is something like:
{
"OrderInfo" : [
{
"sku": "NPC-50",
"qty": 10,
"price": 269.9
},
{
"sku": "ABC",
"qty": 2,
"price": 39.98
},
],
"CustomerInfo" : [
{
"buyName" : "xxxxxxxxx",
"reName" : "xxxxxxxxxxxx",
"email" : "xxxxxxxxxxxx#marketplace.amazon.com",
"street1" : "xxxxxxxxxxx",
"street2" : "",
"city" : "xxxxxxxxxx",
"state" : "xxxxxxxxxxxx",
"zipCode" : "xxxxxxxxxx"
},
{
"buyName" : "xxxxxxxxxx",
"reName" : "xxxxxx",
"email" : "xxxxxxxx#marketplace.amazon.com",
"street1" : "xxxxxxxxxxx",
"street2" : "",
"city" : "xxxxx",
"state" : "xxxx",
"zipCode" : "xxxxxxxx"
}
],
"total_price" : 309.88
}
Any Help will be appreciated.

Answer 1

You can use below aggregation.
db.order.aggregate([
{"$group":{
"_id":{"email":"$email","sku":"$sku"},
"qty":{"$sum":"$qty"},
"price":{"$sum":"$price"},
"CustomerInfo":{
"$addToSet":{
"buyName":"$buy_name",
"reName":"$reci_name",
"email":"$email",
"street1":"$street1",
"street2":"$street2",
"city":"$city",
"state":"$state",
"zipCode":"$zip_code"
}
}
}},
{"$group":{
"_id":"$_id.email",
"OrderInfo":{"$push":{"sku":"$_id.sku","qty":"$qty","price":"$price"}},
"total_price":{"$sum":"$price"},
"CustomerInfo":{"$first":"$CustomerInfo"}
}},
{"$match":{"total_price":{"$gt":100}}},
{"$sort":{"total_price":-1}}
])

Answer 2

You can try below aggregation
db.collection.aggregate([
{ "$group": {
"_id": {
"email": "$email",
"sku": "$sku"
},
"CustomerInfo": {
"$addToSet": {
"buyName": "$buy_name",
"otherFields": "$otherFields",
}
},
"price": { "$sum": "$price" },
"qty": { "$sum": "$qty" }
}},
{ "$group": {
"_id": "$_id.email",
"CustomerInfo": { "$first": "$CustomerInfo" },
"OrderInfo": {
"$push": {
"sku": "$_id.sku",
"qty": "$qty",
"price": "$price"
}
}
}}
])