How to make a nested relationship on mongodb? - node.js

Question

For example i have 4 collections. There are:
"company" collection
{
"id_company": "C01"
"company_name": "Sidomuncul"
"like": [
"123",
"121"
]
}
"user" collection
{
"id_user": "123",
"name": "Astra",
"major": "111",
"language": [{
"id_language": "101",
"level": "Expert"
}]
},
{
"id_user": "121",
"name": "Bibi",
"id_major": "112",
"language": [{
"id_language": "102",
"level": "Intermediate"
}]
}
"major" collection
{
"id_major": "111",
"name": "IT"
},
{
"id_major": "112",
"name": "Designer"
}
"language" collection
{
"id_language": "101",
"name": "English"
},
{
"id_language": "102",
"name": "Chinese"
}
And when i make a route for get who are like company by id_company "C01", i want show the result relation id_user in "like" field with user collection. Example result:
{
"id_company": C01",
"like": [
{
"id_user": "123",
"name": "Astra",
"major": "IT",
"language": [{
"id_language": "English",
"level": "Expert"
}]
},
{
"id_user": "121",
"name": "Bibi",
"id_major": "Designer",
"language": [{
"id_language": "Chinese",
"level": "Intermediate"
}]
}
] //Close Like Field
}
Thanks before.

Answer 1

SOLVED
Use lookup and group also push

Answer 2

Using Mongo aggregate pipeline you can collect required result in multiple stages. For mongo aggregate query you can use $lookup, $set, $unwind and $group stages. Try this query, you might get required result set:
db.company.aggregate([
{
"$unwind": "$like"
},
{
$lookup: {
from: "user",
localField: "like",
foreignField: "id_user",
as: "like"
}
},
{
"$unwind": "$like"
},
{
$lookup: {
from: "major",
localField: "like.major",
foreignField: "id_major",
as: "major"
}
},
{
"$unwind": "$major"
},
{
$set: {
"like.major": "$major.name"
}
},
{
$lookup: {
from: "language",
localField: "like.language.id_language",
foreignField: "id_language",
as: "lang"
}
},
{
"$unwind": "$lang"
},
{
$set: {
"like.language.id_language": "$lang.name"
}
},
{
$group: {
_id: "id_company",
company_name: {
"$first": "$company_name"
},
like: {
$push: {
id_user: "$like.id_user",
major: "$like.major",
name: "$like.name",
language: "$like.language"
}
}
}
}
])