MongoDB aggregate query $lookup - mongodb

Question

I'm trying to populate my user field with $lookup and here is my output:
[
{
...
user: [],
...
}
]
As you can see, The output is an array and user field is an empty array as well, also I want to make a query, that compare multiple fields. Lets say I have this object:
{
social: {
facebook: 'facebook.com/asd',
twitter: 'https://twitter.com/'
},
skills: [ 'asd', 'asd', 'html' ],
_id: 5eec9c9a2d6d1d46e8b05fb4,
user: {
_id: 5eec9c752d6d1d46e8b05fb3,
name: 'Simeon Lazarov',
avatar: 'uploads\\1592682240020 - background.jpg'
},
status: 'Junior Developer',
experience: [
{
current: true,
_id: 5eef06638af42217d8c5480a,
title: 'ASD',
company: 'SAD',
location: 'ASD',
from: 2020-06-08T00:00:00.000Z,
to: null
}
],
education: [
{
current: true,
_id: 5eef5f0dd06ee324a4a7b1d2,
school: 'asd',
degree: 'asd',
fieldofstudy: 'asd',
from: 2020-06-24T00:00:00.000Z,
to: null
}],
contacts: [ { _id: 5eee23bd862ab70ba0235a85, user: 5eedffa6062e6231a859433a } ],
date: 2020-06-19T11:08:10.883Z,
__v: 1,
website: 'asd',
company: 'asd'
}
And want to compare if company, skills(all skills of this object to be contained in others objects) or etc. are equal.
Here is my NOT working code:
await Profile.aggregate([{$lookup: {from:"user",localField: "user",
foreignField: "name", as: "user"}},{$match :{$or:[{"company":{$regex:profile.company}},{"skills":{ $eq: profile.skills} }]}}]).skip((req.params.page - 1) * 10).limit(11);
P.S Sorry for writing so bad, it's my first question here.

Answer 1

It seems you just have mismatches in your $lookup fields compare to what the schema holds, I rewrote it like this:
await Profile.aggregate([
{
$match: {
$or: [
{"company": {$regex: profile.company}},
{"skills": {$all: profile.skills}}
]
}
},
{
$skip: req.params.page ? req.params.page - 1 : 0 // make sure this can't be -1
},
{
$limit: 11
},
{
$lookup: {
from: "user",
localField: "user",
foreignField: "_id",
as: "user"
}
},
{
"$unwind": "$user"
}
])
Notice I moved the $lookup to be the last stage as it's the most expensive part of the pipeline and there's no need to do it on the entire collection.