Data access within embedded Structs

I have a model that uses some based embedded structs, and I’m looking for the best way to retrieve values. I’m omitting a lot of the model for simplicity:

#[derive(Debug, Serialize, Deserialize)]
pub struct Devices {
    #[serde(rename = "_id")]
    pub id: Option<bson::oid::ObjectId>,
    pub system: System,
#[derive(Debug, Serialize, Deserialize)]
pub struct System {
    pub id: Option<u32>,

Currently I’m using a match on the result to check for an error, but assuming that passes, I’m then using a match to get to the underlying optional id.

let device_id = match &result {
            Ok(Some(device)) => match {
                Some(id) => id,
                None => 0,
            Ok(None) => 0,
            Err(e) => panic!("DB error: {}", e),

As an example, I’m trying to get something like the following to work (I know the following doesn’t work) - yet.

pub fn get_device_id(model: &Devices) -> Option<u32> {

Any thoughts would be most appreciated. Thanks

Sorry, I missed an Option in the Devices struct: