How would I be able to query depending on array length? - mongodb

Question

I have a project where a user selects a group and then can choose what role they are looking for in that group.
It looks something like this:
let group = await models.Group.findById(user.groupID);
let seekGroupRole = await models.GroupRole.findById(user.seekingGroupRole);
let test = await models.Profile.aggregate([
{
$match: {
$or: [
{ _id: { $in: group.members } },
{ _id: { $in: seekGroupRole.profiles } },
],
},
},
{ $group: { _id: "$_id" } },
]);
console.log(test);
Now we are adding a way to select multiple roles. How would I go about doing this without having to do multiple queries?
Is something like this possible?
let group = await models.Group.findById(user.groupID);
let seekGroupRole = await models.GroupRole.find({
_id: { $in: user.seekingGroupRole}
});
let test = await models.Profile.aggregate([
{
$match: {
$or: [
{ _id: { $in: group.members } },
{ _id: { $in: seekGroupRole.profiles } },
],
},
},
{ $group: { _id: "$_id" } },
]);
console.log(test);
Now seekGroupRole is an array. It could have the length of 1 or more. So it would be seekGroupRole[0].profiles, seekGroupRole[1].profiles, etc...
What is the best way to accomplish this? Should I for loop and merge the results?

Answer 1

What I ended up doing is using for loop with concat to avoid multiple queries.
let seekGroupRole = await models.GroupRole.find({
_id: { $in: user.seekingGroupRole}
});
let allRoles;
for (let i = 0; i < seekGroupRole.length; i++) {
if (i == 0) {
allRoles = seekGroupRole[i].profiles;
}
if (i > 0) {
allRoles = allRoles.concat(
seekGroupRole[i].profiles
);
}
}
let test = await models.Profile.aggregate([
{
$match: {
$or: [
{ _id: { $in: group.members } },
{ _id: { $in: allRoles } },
],
},
},
{ $group: { _id: "$_id" } },
]);