Using $match to query from different arrays with the same key value - mongodb

Question

Suppose I have this simple JSON data of two documents both with two different arrays namely carPolicies and paPolicies. Within these arrays are objects named as policy where it contains a key 'agent' where the value is '47'.
{
"_id": {
"$oid": "some_id"
},
"name": "qwe",
"password": "pw",
"carPolicies": [
{
"policy": {
"agent": "47"
}
},
{
"policy": {
"agent": "47"
}
}
],
"paPolicies": [
{
"policy": {
"agent": "47"
}
},
{
"policy": {
"agent": "47"
}
}
]
}
{
"_id": {
"$oid": "some_id"
},
"name": "rty",
"password": "wp",
"carPolicies": [
{
"policy": {
"agent": "47"
}
},
{
"policy": {
"agent": "47"
}
}
],
"paPolicies": [
{
"policy": {
"agent": "47"
}
},
{
"policy": {
"agent": "47"
}
}
]
}
Using mongoDB's $match operator, how do I come up with a query that if agent value is 47 in either arrays, it returns me the document's name?
This is what I currently have:
db.collection('users').aggregate([
// Get just the docs that contain an agent element where agent is === req.params.name
{$match: {$or: [{'paPolicies.policy.agent': req.params.name}, {'carPolicies.policy.agent': req.params.name}]} },
{
$project: {
policy: {
$filter: {
// how to do an 'or' operator at 'input' so it can be input: '$paPolicies.policy || $carPolicies.policy'
input: '$paPolicies.policy',
as: 'police',
cond: { $eq: ['$$police.agent', req.params.name]}
}
},
_id: 1, name: 1
}
}
])
I know that the above code is wrong but I feel like it's the closest I can currently get to a solution and hopefully gives an idea of what I'm trying to achieve.

Answer 1

If I get the requirement right. How about just using dot(.) notation in a .find() query with projection as second parameter.
db.collection.find({
$or: [
{
"carPolicies.policy.agent": "47"
},
{
"paPolicies.policy.agent": "47"
}
]
},
{
"_id": 1,
"name": 1
})