How to count from two fields in mongoDB - mongodb

Question

{
"_id" : ObjectId("56bd8e9de517259412a743ab"),
"user_token" : "mzXhdbCu",
"sender_details" : {
"location" : "XYZ",
"zipcode" : "610208"
},
"shipping_address" : {
"location" : "ABC",
"zipcode" : "602578
}
}
I have been trying to count the number of instances of each unique zipcode from both
$sender_details.zipcode
and
$shipping_address.zipcode
I tried to use the following code
db.ac_consignments.aggregate({
$group: {
_id: {
"zipcode":"$sender_details.zipcode",
"szipcode":"$shipping_address.zipcode"
},
count: {"$sum":1}
}
})
The output I receive is this
{
"result" : [
{
"_id" : {
"zipcode" : "610208",
"szipcode" : "602578"
},
"count" : 7
},
{
"_id" : {
"zipcode" : "602578",
"szipcode" : "678705"
},
"count" : 51
}
],
"ok" : 1
}
But what I require is the count of each zipcode present in $sender_details.zipcode and $shipping_address.zipcode totally. So an output like this
{
"result" : [
{
"_id" : {
"zipcode" : "610208",
},
"count" : 7
},
{
"_id" : {
"zipcode" : "602578"
},
"count" : 51
}
{
"_id" : {
"zipcode" : "678705"
},
"count" : 51
}
],
"ok" : 1
}

Answer 1

The following pipeline should work for you
db.getCollection('ac_consignments').aggregate([
{
$project: {
zipcode: [ "$sender_details.zipcode", "$shipping_address.zipcode" ]
}
},
{
$unwind: "$zipcode"
},
{
$group: {
_id: "$zipcode",
count: { $sum: 1 }
}
}
])
which produces output like this
/* 1 */
{
"_id" : "610208",
"count" : 1.0
}
/* 2 */
{
"_id" : "610209",
"count" : 2.0
}
/* 3 */
{
"_id" : "602578",
"count" : 1.0
}
/* 4 */
{
"_id" : "602579",
"count" : 2.0
}
when using the following as sample data
/* 1 */
{
"_id" : ObjectId("56bd8e9de517259412a743ab"),
"user_token" : "mzXhdbCu",
"sender_details" : {
"location" : "XYZ",
"zipcode" : "610208"
},
"shipping_address" : {
"location" : "ABC",
"zipcode" : "602578"
}
}
/* 2 */
{
"_id" : ObjectId("56bd8e9de517259412a743ac"),
"user_token" : "mzXhdbCu",
"sender_details" : {
"location" : "XYZ",
"zipcode" : "610209"
},
"shipping_address" : {
"location" : "ABC",
"zipcode" : "602579"
}
}
/* 3 */
{
"_id" : ObjectId("56bd8e9de517259412a753ac"),
"user_token" : "mzXhdbCu",
"sender_details" : {
"location" : "XYZ",
"zipcode" : "610209"
},
"shipping_address" : {
"location" : "ABC",
"zipcode" : "602579"
}
}
See the following GIF
Update for older versions
db.getCollection('ac_consignments').aggregate([
{
$project: {
sender_zip: "$sender_details.zipcode",
shipping_zip: "$shipping_address.zipcode",
party: { $literal: ["sender_zip", "shipping_zip"] }
}
},
{
$unwind: "$party"
},
{
$group: {
_id: "$_id",
zipcode: {
$push: {
$cond: [
{ $eq: ["$party", "sender_zip"] },
"$sender_zip",
"$shipping_zip"
]
}
}
}
},
{
$unwind: "$zipcode"
},
{
$group: {
_id: "$zipcode",
count: { $sum: 1 }
}
}
])