query_as and optional fields

[josejachuf]

Hi, given the following, implemented in Salvo (Web Framework)

#[derive(FromRow, Serialize, Debug)]
pub struct User {
    pub id: i64,
    pub email: String,
    pub first_name: String,
    pub last_name: String,
}

#[handler]
pub async fn get_user(req: &mut Request, res: &mut Response) {
    let uid = req.query::<i64>("uid").unwrap();
    let data = sqlx::query_as::<_, User>("select * from auth_users where id = $1")
        .bind(uid)
        .fetch_one(get_postgres())
        .await;
    match data {
        Ok(user) => res.render(Json(&user)),
        _ => {
            res.set_status_code(StatusCode::from_u16(204).unwrap());
        }
    }
}

The above works fine. But if you want to add an optional field, an error occurs. I want to get that optional field from another source, for example an API rest

#[derive(Serialize, Debug)]
pub struct CustomData {
    pub id: i64
    pub name: String,
}

#[derive(FromRow, Serialize, Debug)]
pub struct User {
    pub id: i64,
    pub email: String,
    pub first_name: String,
    pub last_name: String,
    pub documento: String,
    // #[sqlx(default)]
    pub custom_data: Option<Vec<CustomData>>,
}

#[derive(FromRow, Serialize, Debug)]
| ^^^^^^^
40 | pub struct User {
| ^^^^
note: required by a bound in sqlx::query_as
--> /sqlx-core-0.6.2/src/query_as.rs:174:8
|
174 | O: for<'r> FromRow<'r, DB::Row>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in sqlx::query_as

How should I define the structures to be able to do what I need?

Jose