MongoDB Query that will $project document values in horizontal format - mongodb

Question

Im trying to create a query that will project or show the field in HORIZONTAL format. Below is my sample collection and the expected output. BTW, Im also using jaspersoft studio to create the report but i think my output should be done in mongodb query. Hope someone can help. Thanks!
"_id" : ObjectId("60ddc6f44c893c117141e9b9"),
"observationvalues" : [
{
"_id" : ObjectId("60ddc6f44c893c117141e9c3"),
"name" : "Systolic BP",
"resultvalue" : "88.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9c2"),
"name" : "Diastolic BP",
"resultvalue" : "66.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9c1"),
"name" : "Weight",
"resultvalue" : "90.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9c5"),
"name" : "Height",
"resultvalue" : null
}
],
"createdat" : ISODate("2021-07-01T13:45:24.679Z"),
"modifiedat" : ISODate("2021-07-01T13:45:24.679Z"),
"statusflag" : "A"
"_id" : ObjectId("60ddc6f44c893c117141e8b8"),
"observationvalues" : [
{
"_id" : ObjectId("60ddc6f44c893c117141e9b3"),
"name" : "Systolic BP",
"resultvalue" : "84.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9b2"),
"name" : "Diastolic BP",
"resultvalue" : "63.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9b1"),
"name" : "Weight",
"resultvalue" : "99.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9b5"),
"name" : "Height",
"resultvalue" : 172.00
}
],
"createdat" : ISODate("2021-07-02T13:45:24.679Z"),
"modifiedat" : ISODate("2021-07-02T13:45:24.679Z"),
"statusflag" : "A"
"_id" : ObjectId("60ddc6f44c893c117141e7b7"),
"observationvalues" : [
{
"_id" : ObjectId("60ddc6f44c893c117141e9a3"),
"name" : "Systolic BP",
"resultvalue" : "81.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9a2"),
"name" : "Diastolic BP",
"resultvalue" : "65.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9a1"),
"name" : "Weight",
"resultvalue" : "96.00"
},
{
"_id" : ObjectId("60ddc6f44c893c117141e9a5"),
"name" : "Height",
"resultvalue" : 165.00
}
],
"createdat" : ISODate("2021-07-03T13:45:24.679Z"),
"modifiedat" : ISODate("2021-07-03T13:45:24.679Z"),
"statusflag" : "A",
The expected Output will be:
{"createdat" : "2021-07-01T13:45:24.679Z", "Systolic BP" : 88.00 ,"Diastolic BP" : 66.00 ,"Weight": 90.00 ,"Height":null }
{"createdat" : "2021-07-01T13:45:24.679Z", "Systolic BP" : 84.00 ,"Diastolic BP" : 63.00 ,"Weight": 99.00 ,"Height":172.00 }
{"createdat" : "2021-07-03T13:45:24.679Z", "Systolic BP" : 81.00 ,"Diastolic BP" : 65.00 ,"Weight": 96.00 ,"Height":165.00 }
I have created my query but it is not having the output in one line grouped for each createdat field
{
$project : {
_id: {
"systolic": {"$cond": [ { "$eq": ["$name","Systolic BP" ] }, "$resultvalue","" ] },
"diastolic": {"$cond": [ { "$eq": ["$name","Diastolic BP" ] }, "$resultvalue","" ] },
"weight": {"$cond": [ { "$eq": ["$name","Weight" ] }, "$resultvalue","" ] },
"height": {"$cond": [ { "$eq": ["$name","Height" ] }, "$resultvalue","" ] },
"create": "$createdat"
}
}
},

Answer 1

Your expected data output could be done like this: playground
[
{
"$project": {
"createdat": 1,
"rows": {
"$arrayToObject": {
"$map": {
"input": "$observationvalues",
"in": {
"k": "$$this.name",
"v": {
"$convert": {
"input": "$$this.resultvalue",
"to": "double",
"onError": null,
"onNull": null
}
}
}
}
}
}
}
},
{
"$addFields": {
"rows.create": "$createdat"
}
},
{
"$replaceRoot": {
"newRoot": "$rows"
}
},
{
"$match": {
"Systolic BP": 84.00
}
}
]
To get them in one line you should look for some JSON formater.