MongoDB Query - query on values of any key in a sub-object: $match combined with $elemMatch - mongodb

Question

How can I filter on all userIDs that have color blue and size 50 in the same element of the list? Only user 1347 should be output.
{
"userId": "12347",
"settings": [
{ name: "SettingA", color: "blue", size: 10 },
{ name: "SettingB", color: "blue", size: 20 },
{ name: "SettingC", color: "green", size: 50 }
],
}
{
"userId": "1347",
"settings": [
{ name: "SettingA", color: "blue", size: 10 },
{ name: "SettingB", color: "blue", size: 50 },
{ name: "SettingC", color: "green", size: 20 }
]
}
If this can be done with $elemMatch, how can I include it in the following query, assuming the following two elements needs to be in the same list: { "rounds.round_values.decision" : "Fold"},
{ "rounds.round_values.gameStage" : "PreFlop"}
I tried this query but it doesn't yield any results. I've read that because elemMatch deosnt' work in projections. But how can I tell $filter to only return objects that have the $elemmMatch conditions met?
db.games.aggregate([
{ $match: { $and: [
{ Template: "PPStrategy4016" },
{ FinalOutcome: "Lost" }]
}},
{ $elemMatch: {
{ "rounds.round_values.decision" : "Fold"},
{ "rounds.round_values.gameStage" : "PreFlop"}
} },
{
$group: {
_id: null,
total: {
$sum: "$FinalFundsChange"
}
}
} ] )

Answer 1

Following the given documents, the query is something such as follows:
db.games.aggregate(
{$unwind : "$settings"},
{$match: {"settings.color" : "blue", "settings.size" : 50}} ,
{$group: {_id: null, total: {$sum: "$settings.size"}}} )
If you have difficulties in transforming it into your own domain, pleas supply some example documents from your domain.