I am working with a mongodb aggregation and I would need to replace the part of my object array to an array concatenation. I understand that the part that I have to modify would be push but it is added as objects and I am not very clear how to concatenate that part
This is my current aggregation:
Datagreenhouse.aggregate([
{ "$match": { "id_sensor_station_absolute": { "$in": arr }, "recvTime": { $gte: fechainicio, $lte: fechafin } } }, //, "id_station": { "$in": id_station }
{
"$lookup": {
"from": "station_types",
"localField": "id_station", // local field in measurements collection
"foreignField": "id_station", //foreign field from sensors collection
"as": "sensor"
}
},
{ "$unwind": "$sensor" },
{
"$addFields": {
"sensor.attrValue": "$attrValue", // Add attrValue to the sensors
"sensor.recvTime": "$recvTime", // Add attrName to the sensors
"sensor.marca": "$sensor.marca",
"sensor.sensor_type": {
$filter: {
input: '$sensor.sensor_type',
as: 'shape',
cond: { $eq: ['$$shape.name', '$attrName'] },
}
}
}
},
{
"$group": {
"_id": {
"name_comun": "$sensor.sensor_type.name_comun",
"name_comun2": "$sensor.marca"
}, // Group by time
"data": {
"$push": {
"name": "$sensor.recvTime",
"value": "$sensor.attrValue",
},
},
}
},
{
"$project": {
"name": {
$reduce: {
input: [
["$_id.name_comun2"]
],
initialValue: "$_id.name_comun",
in: { $concatArrays: ["$$value", "$$this"] }
}
},
"_id": 0,
"data": 1
}
}
]
The current output of this aggregation is:
[
{
"data":[
{
"name":"2020-06-04T14:30:50.00Z",
"value":69.4
},
{
"name":"2020-06-04T14:13:31.00Z",
"value":68.9
}
],
"name":[
"Hum. Relativa",
"Hortisys"
]
},
{
"data":[
{
"name":"2020-06-04T14:30:50.00Z",
"value":25.5
},
{
"name":"2020-06-04T14:13:31.00Z",
"value":26.6
}
],
"name":[
"Temp. Ambiente",
"Hortisys"
]
}
]
I need to change the format of data for data: [[], [], []]
Example:
[
{
"data":[
["2020-06-04T14:30:50.00Z",69.4],
["2020-06-04T14:13:31.00Z",68.9],
"name":[
"Hum. Relativa",
"Hortisys"
]
},
{
"data":[
["2020-06-04T14:30:50.00Z",69.4],
["2020-06-04T14:13:31.00Z",68.9],
"name":[
"Temp. Ambiente",
"Hortisys"
]
}
]
The $push operator won't accept an array directly, but you can give it another operator that returns an array, like
data:{ $push:{ $concatArrays:[[ "$sensor.recvTime", "$sensor.attrValue" ]]}},
Related
I have two collections "datasets" and "users".
I tried to lookup datasets.assignedTo = users.id that's working fine. Also, I want to match the field of datasets.firstBillable >= users.prices.beginDate date field are matched to get the current index price value. And also check users.prices.endDate is less than or equal to users.prices.beginDate.
For example:
cgPrices: 45
https://mongoplayground.net/p/YQps9EozlAL
Collections:
db={
users: [
{
id: 1,
name: "Aravinth",
prices: [
{
beginDate: "2022-08-24T07:29:01.639Z",
endDate: "2022-08-31T07:29:01.639Z",
price: 45
}
]
},
{
id: 2,
name: "Raja",
prices: [
{
beginDate: "2022-07-25T07:29:01.639Z",
endDate: "2022-07-30T07:29:01.639Z",
price: 55
}
]
}
],
datasets: [
{
color: "braun, rose gold",
firstBillable: "2022-08-24T07:29:01.639Z",
assignedTo: 1
},
{
color: "beige, silber",
firstBillable: "2022-07-25T07:29:01.639Z",
assignedTo: 2
}
]
}
My current implementation:
db.datasets.aggregate([
{
"$lookup": {
"from": "users",
"as": "details",
let: {
assigned_to: "$assignedTo",
first_billable: "$firstBillable"
},
pipeline: [
{
"$match": {
$expr: {
"$and": [
{
"$eq": [
"$id",
"$$assigned_to"
]
},
{
"$gte": [
"$first_billable",
"$details.prices.beginDate"
]
},
{
"$lte": [
"$first_billable",
"$details.prices.endDate"
]
}
]
}
}
}
]
}
},
{
"$addFields": {
"details": 0,
"cg": {
$first: {
"$first": "$details.prices.price"
}
}
}
}
])
Output i needed:
[
{
"_id": ObjectId("5a934e000102030405000000"),
"assignedTo": 1,
"cg": 45,
"color": "braun, rose gold",
"details": 0,
"firstBillable": "2022-08-24T07:29:01.639Z"
},
{
"_id": ObjectId("5a934e000102030405000001"),
"assignedTo": 2,
"cg": 55,
"color": "beige, silber",
"details": 0,
"firstBillable": "2022-07-25T07:29:01.639Z"
}
]
https://mongoplayground.net/p/YQps9EozlAL
Concerns:
You should compare the date as Date instead of string, hence you are required to convert the date strings to Date before comparing.
In users collection, prices is an array. You need to deconstruct the array to multiple documents first before compare the date fields in price.
The query should be:
db.datasets.aggregate([
{
"$lookup": {
"from": "users",
"as": "details",
let: {
assigned_to: "$assignedTo",
first_billable: {
$toDate: "$firstBillable"
}
},
pipeline: [
{
$match: {
$expr: {
$eq: [
"$id",
"$$assigned_to"
]
}
}
},
{
$unwind: "$prices"
},
{
"$match": {
$expr: {
"$and": [
{
"$gte": [
"$$first_billable",
{
$toDate: "$prices.beginDate"
}
]
},
{
"$lte": [
"$$first_billable",
{
$toDate: "$prices.endDate"
}
]
}
]
}
}
}
]
}
},
{
"$addFields": {
"details": 0,
"cg": {
$first: "$details.prices.price"
}
}
}
])
Demo # Mongo Playground
I have a two collections.
OrgStructure (visualise this as a tree structure)
Example Document:
{
"id": "org1",
"nodes": [
{
"nodeId": "root",
"childNodes": ["child1"]
},
{
"nodeId": "child1",
"childNodes": ["child2"]
},
{
"nodeId": "child2",
"childNodes": []
}
]
}
Activity
Example Document:
[
{
"id":"A1",
"orgUnit": "root"
},
{
"id":"A2",
"orgUnit": "child1"
},
{
"id":"A3",
"orgUnit": "child2"
}
]
Now my expectation is to group activities by orgUnit such a way that by considering the child nodes as well.
Here i don't want to do a lookup and i need to consider one OrgStructure document as an input, so that i can construct some condition using the document such a way that the query will return the below result.
Expected result
[
{
"_id": "root",
"activities": ["A1","A2","A3"]
},
{
"_id": "child1",
"activities": ["A2","A3"]
},
{
"_id": "child2",
"activities": ["A3"]
}
]
So im ecpecting an aggregate query something like this
{
"$group": {
"_id": {
"$switch": {
"branches": [
{
"case": {"$in": ["$orgUnit",["root","child1","child2"]]},
"then": "root"
},
{
"case": {"$in": ["$orgUnit",["child1","child2"]]},
"then": "child1"
},
{
"case": {"$in": ["$orgUnit",["child2"]]},
"then": "child2"
}
],
"default": null
}
}
}
}
Thanks in advance!
You will need 2 steps:
create another collection nodes for recursive lookup. The original OrgStructure is hard to perform $graphLookup
db.OrgStructure.aggregate([
{
"$unwind": "$nodes"
},
{
"$replaceRoot": {
"newRoot": "$nodes"
}
},
{
$out: "nodes"
}
])
Perform $graphLookup on nodes collection to get all child nodes. Perform $lookup to Activity and do some wrangling.
db.nodes.aggregate([
{
"$graphLookup": {
"from": "nodes",
"startWith": "$nodeId",
"connectFromField": "childNodes",
"connectToField": "nodeId",
"as": "nodesLookup"
}
},
{
"$lookup": {
"from": "Activity",
"let": {
nodeId: "$nodesLookup.nodeId"
},
"pipeline": [
{
$match: {
$expr: {
$in: [
"$orgUnit",
"$$nodeId"
]
}
}
},
{
$group: {
_id: "$id"
}
}
],
"as": "activity"
}
},
{
$project: {
_id: "$nodeId",
activities: "$activity._id"
}
}
])
Here is the Mongo playground for your reference.
I have 3 table users,shifts,temporaryShifts,
shifts:[{_id:ObjectId(2222),name:"Morning"},{_id:ObjectId(454),name:"Night"}]
users:[{_id:ObjectId(123),name:"Albert",shift_id:ObjectId(2222)}]
temporaryShifts:[
{_id:2,userId:ObjectId(123),shiftId:ObjectId(454),type:"temporary",date:"2020-02-01"},
{_id:987,userId:ObjectId(123),shiftId:ObjectId(454),type:"temporary",date:"2020-02-03"},
{_id:945,userId:ObjectId(123),shiftId:ObjectId(454),type:"temporary",date:"2020-02-08"},
{_id:23,userId:ObjectId(123),shiftId:ObjectId(454),date:"2020-02-09"}]
i want to make a mongoose aggregate query then give me result :
get result between two dates for example :2020-02-01 2020-02-05,
resullts is :
[
{_id:ObjectId(123),name:"Albert",shift:[
{_id:2,shiftId:ObjectId(454),type:"temporary",date:"2020-02-01"},
{_id:2,shiftId:ObjectId(2222),type:"permanent",date:"2020-02-02"},
{_id:2,shiftId:ObjectId(454),type:"temporary",date:"2020-02-03"},
{_id:2,shiftId:ObjectId(2222),type:"permanent",date:"2020-02-04"},
{_id:2,shiftId:ObjectId(2222),type:"permanent",date:"2020-02-05"},
]}
]
in result type temporary mean selected date in table temporaryShift document available else type permanent
MongoPlayGround You Can edit
You can first project a date range array using $range, in your example it will be like [2020-02-01, 2020-02-02, 2020-02-03, 2020-02-04, 2020-02-05], then you can use the array to perform $lookup
db.users.aggregate([
{
$limit: 1
},
{
"$addFields": {
"startDate": ISODate("2020-02-01"),
"endDate": ISODate("2020-02-05")
}
},
{
"$addFields": {
"dateRange": {
"$range": [
0,
{
$add: [
{
$divide: [
{
$subtract: [
"$endDate",
"$startDate"
]
},
86400000
]
},
1
]
}
]
}
}
},
{
"$addFields": {
"dateRange": {
$map: {
input: "$dateRange",
as: "increment",
in: {
"$add": [
"$startDate",
{
"$multiply": [
"$$increment",
86400000
]
}
]
}
}
}
}
},
{
"$unwind": "$dateRange"
},
{
"$project": {
"name": 1,
"shiftId": 1,
"dateCursor": "$dateRange"
}
},
{
"$lookup": {
"from": "temporaryShifts",
"let": {
dateCursor: "$dateCursor",
shiftId: "$shiftId"
},
"pipeline": [
{
"$addFields": {
"parsedDate": {
"$dateFromString": {
"dateString": "$date",
"format": "%Y-%m-%d"
}
}
}
},
{
$match: {
$expr: {
$and: [
{
$eq: [
"$$dateCursor",
"$parsedDate"
]
}
]
}
}
}
],
"as": "temporaryShiftsLookup"
}
},
{
"$unwind": {
path: "$temporaryShiftsLookup",
preserveNullAndEmptyArrays: true
}
},
{
$project: {
shiftId: 1,
type: {
"$ifNull": [
"$temporaryShiftsLookup.type",
"permanent"
]
},
date: "$dateCursor"
}
}
])
Here is the Mongo Playground for your reference.
Collection:
[
{
"name": "device1",
"type": "a",
"para": {
"number": 3
}
},
{
"name": "device2",
"type": "b",
"additional": "c",
"para": {
"number": 1
}
}
]
My query:
db.collection.aggregate([
{
"$addFields": {
"arrayofkeyvalue": {
"$objectToArray": "$$ROOT"
}
}
},
{
"$unwind": "$arrayofkeyvalue"
},
{
"$group": {
"_id": null,
"allkeys": {
"$addToSet": "$arrayofkeyvalue.k"
}
}
}
])
The output currently:
[
{
"_id": null,
"allkeys": [
"additional",
"_id",
"para",
"type",
"name"
]
}
]
Detail see Playground
What I want to do is add a new column which includes all of top key of the mongodb query output, exclude "para". And then combine it with the old collection to form a new json.
Is it possible?
The expected result:
{
"column": [{"prop": "name"}, {"prop": "type"}, {"prop": "additional"}],
"columnData": [
{
"name": "device1",
"type": "a",
"para": {
"number": 3
}
},
{
"name": "device2",
"type": "b",
"additional": "c",
"para": {
"number": 1
}
}
]
}
You have the right general idea in mind, here's how I would do it by utilizing operators like $filter, $map and $reduce to manipulate the objects structure.
I separated the aggregation into 3 parts for readability but you can just merge stage 2 and 3 if you wish.
db.collection.aggregate([
{
"$group": {
"_id": null,
columnData: {
$push: "$$ROOT"
},
"keys": {
"$push": {
$map: {
input: {
"$objectToArray": "$$ROOT"
},
as: "field",
in: "$$field.k"
}
}
}
}
},
{
"$addFields": {
unionedKeys: {
$filter: {
input: {
$reduce: {
input: "$keys",
initialValue: [],
in: {
"$setUnion": [
"$$this",
"$$value"
]
}
}
},
as: "item",
cond: {
$not: {
"$setIsSubset": [
[
"$$item"
],
[
"_id",
"para"
]
]
}
}
}
}
}
},
{
$project: {
_id: 0,
columnData: 1,
column: {
$map: {
input: "$unionedKeys",
as: "key",
in: {
prop: "$$key"
}
}
}
}
}
])
Mongo Playground
I'm having hard time getting $lookup with a pipeline to work in MongoDB Compass.
I have the following collections:
Toys
Data
[
{
"_id": {
"$oid": "5d233c3bb173a546386c59bb"
},
"type": "multiple",
"tags": [
""
],
"searchFields": [
"Jungle Stampers - Two",
""
],
"items": [
{
"$oid": "5d233c3cb173a546386c59bd"
},
{
"$oid": "5d233c3cb173a546386c59be"
},
{
"$oid": "5d233c3cb173a546386c59bf"
},
{
"$oid": "5d233c3cb173a546386c59c0"
},
{
"$oid": "5d233c3cb173a546386c59c1"
},
{
"$oid": "5d233c3cb173a546386c59c2"
},
{
"$oid": "5d233c3cb173a546386c59c3"
},
{
"$oid": "5d233c3cb173a546386c59c4"
}
],
"name": "Jungle Stampers - Two",
"description": "",
"status": "active",
"category": {
"$oid": "5cfe727cac920000086b880e"
},
"subCategory": "Stamp Sets",
"make": "",
"defaultCharge": null,
"defaultOverdue": null,
"sizeCategory": {
"$oid": "5d0cfde57561e107c88fbde3"
},
"ageFrom": {
"$numberInt": "24"
},
"ageTo": {
"$numberInt": "120"
},
"images": [
{
"_id": {
"$oid": "5d233c3bb173a546386c59bc"
},
"id": {
"$oid": "5d233c39b173a546386c59ba"
},
"url": "/toyimages/5d233c39b173a546386c59ba.jpg",
"thumbUrl": "/toyimages/thumbs/tn_5d233c39b173a546386c59ba.jpg"
}
],
"__v": {
"$numberInt": "2"
}
}
]
Loans
Data
[
{
"_id": {
"$oid": "5e1f1661b712215978c746d9"
},
"tags": [],
"member": {
"$oid": "5e17495e4f81ab3f900dbb63"
},
"source": "admin portal - potter1#gmail.com",
"items": [
{
"id": {
"$oid": "5e1f160eb712215978c746d5"
},
"status": "new",
"_id": {
"$oid": "5e1f1661b712215978c746db"
},
"toy": {
"$oid": "5d233c3bb173a546386c59bb"
},
"cost": {
"$numberInt": "0"
}
},
{
"id": {
"$oid": "5e1f160eb712215978c746d5"
},
"status": "new",
"_id": {
"$oid": "5e1f1661b712215978c746da"
},
"toy": {
"$oid": "5d233b1ab173a546386c59b5"
},
"cost": {
"$numberInt": "0"
}
}
],
"dateEntered": {
"$date": {
"$numberLong": "1579095632870"
}
},
"dateDue": {
"$date": {
"$numberLong": "1579651200000"
}
},
"__v": {
"$numberInt": "0"
}
}
]
I am trying to return a list of toys and their associated loans that have a status of 'new' or 'out'.
I can use the following $lookup aggregate to fetch all loans:
{
from: 'loans',
localField: '_id',
foreignField: 'items.toy',
as: 'loansSimple'
}
However I am trying to use a pipeline to load loans that have the two statuses I am interested in, but it always only returns zero documents:
{
from: 'loans',
let: {
'toyid': '$_id'
},
pipeline: [
{
$match: {
$expr: {
$and: [
{$eq: ['$items.toy', '$$toyid']},
{$eq: ['$items.status', 'new']} // changed from $in to $eq for simplicity
]
}
}
}
],
as: 'loans'
}
This always seems to return 0 documents, however I arrange it:
Have I made a mistake somewhere?
I'm using MongoDB Atlas, v4.2.2, MongoDB Compass v 1.20.4
You are trying to search $$toyid inside inner array, but Operator Expression $eq cannot resolve it.
Best solution: $let (returns filtered loans by criteria) + $filter (applies filter for inner array) operator helps us to get desired result.
db.toys.aggregate([
{
$lookup: {
from: "loans",
let: {
"toyid": "$_id",
"toystatus": "new"
},
pipeline: [
{
$match: {
$expr: {
$gt: [
{
$size: {
$let: {
vars: {
item: {
$filter: {
input: "$items",
as: "tmp",
cond: {
$and: [
{
$eq: [
"$$tmp.toy",
"$$toyid"
]
},
{
$eq: [
"$$tmp.status",
"$$toystatus"
]
}
]
}
}
}
},
in: "$$item"
}
}
},
0
]
}
}
}
],
as: "loans"
}
}
])
MongoPlayground
Alternative solution 1. Use $unwind to flatten items attribute. (We create extra field named tmp which stores items value, flatten it with $unwind operator, match as you were doing and then exclude from result)
db.toys.aggregate([
{
$lookup: {
from: "loans",
let: {
"toyid": "$_id"
},
pipeline: [
{
$addFields: {
tmp: "$items"
}
},
{
$unwind: "$tmp"
},
{
$match: {
$expr: {
$and: [
{
$eq: [
"$tmp.toy",
"$$toyid"
]
},
{
$eq: [
"$tmp.status",
"new"
]
}
]
}
}
},
{
$project: {
tmp: 0
}
}
],
as: "loans"
}
}
])
MongoPlayground
Alternative solution 2. We use $reduce to create toy's array and with $in operator we check if toyid exists inside this array.
db.toys.aggregate([
{
$lookup: {
from: "loans",
let: {
"toyid": "$_id"
},
pipeline: [
{
$addFields: {
toys: {
$reduce: {
input: "$items",
initialValue: [],
in: {
$concatArrays: [
"$$value",
[
"$$this.toy"
]
]
}
}
}
}
},
{
$match: {
$expr: {
$in: [
"$$toyid",
"$toys"
]
}
}
},
{
$project: {
toys: 0
}
}
],
as: "loans"
}
}
])
$expr receives aggregation expressions, At that point $$items.toy is parsed for each element in an array as you would expect (however if it would it will still give you "bad" results as you'll get loans that have the required toy id and any other item with status new in their items array).
So you have two options to work around this:
If you don't care about the other items in the lookup'd document you can add an $unwind stage at the start of the lookup pipeline like so:
{
from: 'loans',
let: {
'toyid': '$_id'
},
pipeline: [
{
$unwind: "$items"
},
{
$match: {
$expr: {
$and: [
{$eq: ['$items.toy', '$$toyid']},
{$eq: ['$items.status', 'new']} // changed from $in to $eq for simplicity
]
}
}
}
],
as: 'loans'
}
If you do care about them just iterate the array in one of the possible ways to get a 'correct' match, here is an example using $filter
{
from: 'loads',
let: {
'toyid': '$_id'
},
pipeline: [
{
$addFields: {
temp: {
$filter: {
input: "$items",
as: "item",
cond: {
$and: [
{$eq: ["$$item.toy", "$$toyid"]},
{$eq: ["$$item.status", "new"]}
]
}
}
}
}
}, {$match: {"temp.0": {exists: true}}}
],
as: 'loans'
}