Update data from one Map to another - rust

Question

How can I do the following.
Suppose I have the following document created
{
"_id": "12345",
"email": "julio#gmail.com",
"password": "julio123",
"created": "2021-08-17",
"status": "0"
}
and now through the created document I wish to have a new document like the following one.
{
"email": "julio#gmail.com",
"password": "julio123",
"status": "1"
}
I don't know if what I did is correct, but I know that more code is missing.
#[cfg(test)]
mod tests {
use serde_json::{Map, json};
#[test]
fn prueba() {
let mut user = Map::new();
user.insert("id".to_string(), json!("12345"));
user.insert("email".to_string(), json!("juan#gmail.com"));
user.insert("password".to_string(), json!("juan123"));
user.insert("created".to_string(), json!("2021-08-17"));
user.insert("status".to_string(), json!("0"));
println!("user: {:#?}", user);
let user2 = user.into_iter().fold(Map::new(), |mut user_map, (key, val)| {
user_map.insert(key.clone(), val.clone());
user_map
});
println!("user2: {:#?}", user2);
}
}
I'm just learning to use functional programming, I need help to get the best possible result.

Answer 1

What you seem to want to achieve is to filter and update some fields, creating a new object as a result.
Here is how you might do that:
let user2 = user
.into_iter()
.filter_map(|(k, v)| match k.as_str() {
"email" => Some((k, v)),
"password" => Some((k, v)),
"status" => Some((k, json!("1"))),
_ => None,
})
.collect::<Map<_, _>>();