MongoDB aggregation framework approach to a multi-doc query - mongodb

Question

I am looking into the best way to organize filtering. I have the following document format:
{
_id: "info",
ids: ["id1", "id2", "id3"]
}
{
_id: "id1",
value: 5
}
{
_id: "id2",
value: 1
}
{
_id: "id3",
value: 5
}
I need to make the following query: get all documents by id from doc "info" and then filter them out by value 5. So, that result would be something like:
{
_id: "id1",
value: 5
}
{
_id: "id3",
value: 5
}
I suppose I need to do unwind on ids, but how do I then select all documents that match those values? Or maybe I should just use $in operator somehow to grab all documents and after that do filtering?
Any help is aprpeciated. Thanks.

Answer 1

If it is only MongoDB shell/script, I would do it like this:
db.ids.find({ _id: { $in: db.ids.findOne({ _id: "info" }).ids }, value: 5 })
You also have worse versions using:
or the eval command:
db.runCommand({
eval: function(value) {
var ids = db.ids.findOne({ _id: "info" }).ids;
return db.ids.find({ _id: { $in: ids }, value: value }).toArray();
},
args: [5]
})
or the $where operator (low performance because you execute one find for each candidate result with value 5):
db.ids.find({
value: 5,
$where: "db.ids.findOne({ _id: 'info', ids: this._id })"
})
But if you are trying to run the queries through a MongoDb driver, the story might be different.