mongodb find and update one with multiple conditions - mongodb

Question

{
roomId: "id",
questions:{
q1:{
user1:"user1's work"
}
}
}
I'm trying to query mongodb with multiple conditions, that roomId has to match, and questions must be q1, and in q1 there must be a user1.
Here's what I've tried so far. Using and operator, but doesn't seems to work.For now I'm using find, as I read in the docs that updateMany has the same query selector as find.
const result = await collection.find({
$and: [
{
roomId: roomId,
},
{
questions: {
currentQuestion: {
userName,
},
},
},
],
});
My schema:
{
roomId: "id",
roomName:"roomName",
questions:{
question1:{
user1:"user1's work",
userN: "userN's work"
},
questionN:{
user1:"",
userN:""
}
}
}
My expected input , (roomId, currentQuestion, userName) for query conditions,"userWork" to be inserted to what's under userName (user1 - userN).
Expected output, that the user's work gets updated with "userWork", under the right room, right currentQuestion and the right user.

Answer 1

You need this query I think:
db.collection.find({
"roomId": "id",
"questions.q1.user1": {
$exists: true
}
})
This query find a roomId which match your 'id' and then, check if exists the element questions.q1.user1.
Mongo playground example here
PS: You said update but... what do you want to update?
Assuming your schema is like
{
roomId: "id",
questions: {
q1: {
user1: "user1's work",
currentQuestion: "currentQuestion1"
}
}
}
Then, the query to update the currentQuestion field whose match the id and has existing questions.q1.user1 is this:
db.collection.update({
"roomId": "id",
"questions.q1.user1": {
$exists: true
}
},
{
"$set": {
"questions.q1.currentQuestion": "new question"
}
})
Example here
Note that if currentQuestion is one level up, you only have to modify $set object.
If you are not asking for this, please provide a complete schema, example input and expected output.