Grouping in MongoDB Aggregate - mongodb

Question

I am starting with MongoDB and i find the Aggregate function hard to understand.
i have read many topics and tried many things, however i still don't get the results i am looking for.
I would like to group some things together to make a overview of the amount of things based on a few match parameters.
my DB:
{
"_id" : ObjectId("5943a4f015813165b6d2b79a"),
"productType" : "mail",
"productAmount" : 1,
"orderid" : "1497607274",
"location" : "99",
"sublocation" : "02",
"date" : ISODate("2017-01-01T09:01:13.000Z"),
"__v" : 0
}
/* 2 */
{
"_id" : ObjectId("5943a4f915813165b6d2b79c"),
"productType" : "mail",
"productAmount" : 1,
"orderid" : "1497607274",
"location" : "99",
"sublocation" : "01",
"date" : ISODate("2017-01-01T09:01:13.000Z"),
"__v" : 0
}
/* 3 */
{
"_id" : ObjectId("5943a4fe15813165b6d2b79e"),
"productType" : "mail",
"productAmount" : 1,
"orderid" : "1497607274",
"location" : "25",
"sublocation" : "01",
"date" : ISODate("2017-01-01T09:01:13.000Z"),
"__v" : 0
}
/* 4 */
{
"_id" : ObjectId("5943a56d15813165b6d2b7a0"),
"productType" : "mail",
"productAmount" : 1,
"orderid" : "1497607274",
"location" : "99",
"sublocation" : "01",
"date" : ISODate("2017-01-01T09:01:13.000Z"),
"__v" : 0
}
/* 5 */
{
"_id" : ObjectId("5943a971a367b069bb3e863c"),
"productType" : "mail",
"productAmount" : 1,
"orderid" : "1497607274",
"location" : "98",
"sublocation" : "01",
"date" : ISODate("2017-01-01T09:01:13.000Z"),
"__v" : 0
}
/* 6 */
{
"_id" : ObjectId("5943d824900fce1821c5845d"),
"productType" : "keychain",
"productAmount" : 1,
"orderid" : "1497607251",
"location" : "25",
"sublocation" : "01",
"date" : ISODate("2017-01-01T09:01:13.000Z")
}
/* 7 */
{
"_id" : ObjectId("5943d9ea900fce1821c5845e"),
"productType" : "mail",
"productAmount" : 1,
"orderid" : "1497607251",
"location" : "25",
"sublocation" : "02",
"date" : ISODate("2017-01-01T09:01:13.000Z")
}
my current query:
db.getCollection('products').aggregate([
{ $group: {
_id : {
"orderid" : "$orderid",
"location" : "$location",
"product" : "$productType",
"sublocation" : "$sublocation",
"date" : "$date",
"aant" : { "$sum" : "$productAmount"}
},
"aantal" : { "$sum" : 1},
"aantal2" : { "$sum" : "$productAmount"}
}
},
{
$group : {
_id : "$_id.product",
"productType" : {
"$push" : {
"loc" : "$_id.location",
"prodtype": "$_id.product",
"count": "$aantal2"},
},
"cnt": {"$sum" : "$aantal2"}
}
}
])
i would like to have this result:
{
Location: 25,
sublocation: 01,
<productTypeX> : <count the number of these products>,
<productTypeY> : <count the number of these products>,
<productTypeZ> : <count the number of these products>
},
{
Location: 25,
sublocation: 02,
<productTypeX> : <count the number of these products>,
<productTypeY> : <count the number of these products>,
<productTypeZ> : <count the number of these products>
}
or:
{
location: 25,
sublocation: 01,
products: [
{
<productTypeX> : <count>,
<productTypeY> : <count>,
<productTypeZ> : <count>
}
},
{
location: 25,
sublocation: 02
products: [
{
<productTypeX> : <count>,
<productTypeY> : <count>,
<productTypeZ> : <count>
}
}
if i get this to work i need to convert it to mongoose for NodeJS (tips are welcome)
Thanks in advance!