MongoDb extract array - mongodb

Question

I have a mongodb which I want to extract some specific data.
Here is my json:
{
"jobs" : [
{
"id": 554523,
"code": "1256-554523",
"name": "Banco de Talentos",
"status": "published",
"type": "vacancy_type_effective",
"publicationType": "external",
"numVacancies": 1,
"departmentId": 108141,
"departmentName": "FUTURAS OPORTUNIDADES",
"roleId": 169970,
"roleName": "BANCO DE TALENTOS",
"createdAt": "2020-10-30T12:23:48.572Z",
"updatedAt": "2020-12-30T23:21:30.403Z",
"branchId": null,
"branchName": null
},
{
"id": 616834,
"code": "1256-616834",
"name": "YYYYYY (o) YYYYY",
"status": "frozen",
"type": "vacancy_type_effective",
"publicationType": "external",
"numVacancies": 1,
"departmentId": 109190,
"departmentName": "TESTE TESTE",
"roleId": 165712,
"roleName": "SL - TESTE PL",
"createdAt": "2020-12-16T14:17:36.187Z",
"updatedAt": "2021-01-29T17:08:43.613Z",
"branchId": 120448,
"branchName": "TESTE TESTE1"
}
],
"application": [
{
"id": 50707344,
"score": 40.251965332031254,
"partnerName": "indeed",
"endedAt": null,
"createdAt": "2020-12-21T11:21:30.587Z",
"updatedAt": "2021-02-18T22:02:35.866Z",
"tags": {},
"candidate": {
"birthdate": "1986-04-04",
"id": 578615,
"name": "TESTE",
"lastName": "TESTE TESTE",
"email": "teste#teste.com.br",
"identificationDocument": "34356792807",
"countryOfOrigin": "BR",
"linkedinProfileUrl": "teste",
"gender": "female",
"mobileNumber": "[phone]",
"phoneNumber": "(11)2463-2039"
},
"job": {
"id": 619713,
"name": "XXXXde XXXX Pleno"
},
"manualCandidate": null,
"currentStep": {
"id": 3527370,
"name": "Cadastro",
"status": "done"
}
},
{
"id": 50707915,
"score": 3.75547943115234E+1,
"partnerName": "indeed",
"endedAt": null,
"createdAt": "2020-12-21T11:31:31.877Z",
"updatedAt": "2021-02-18T14:07:06.605Z",
"tags": {},
"candidate": {
"birthdate": "1971-10-02",
"id": 919358,
"name": "TESTE TESTE",
"lastName": "SILVA",
"email": "teste.teste#teste.com",
"identificationDocument": "3232323232",
"countryOfOrigin": "BR",
"linkedinProfileUrl": "teste/",
"gender": "female",
"mobileNumber": "11 94021- 5521",
"phoneNumber": "[phone]"
},
"job": {
"id": 619713,
"name": "Analista de XXXXX Pleno"
},
"manualCandidate": null,
"currentStep": {
"id": 3527370,
"name": "Cadastro",
"status": "done"
}
}
]
}
My question is: How can I extract only the array objects in jobs and application separately? Anyone knows the code in Mongodb for do this?
I need do this task for after I can insert the extract separated data in different collections.
Thanks a lot.

Answer 1

Unfortunately there is no real "good" way of doing this. Here is an example of how I would do it by using $facet and other operators to manipulate the structure
db.collection.aggregate([
{
$match: {
/** your query*/
}
},
{
$facet: {
jobs: [
{
$unwind: "$jobs"
},
{
$replaceRoot: {
newRoot: "$jobs"
}
}
],
applications: [
{
$unwind: "$application"
},
{
$replaceRoot: {
newRoot: "$application"
}
}
]
}
},
{
$addFields: {
"merged": {
"$concatArrays": [
"$jobs",
"$applications"
]
}
}
},
{
$unwind: "$merged"
},
{
"$replaceRoot": {
"newRoot": "$merged"
}
}
])
Mongo Playground
I would personally just do it in code after you fetched the document.