Hands-On Microservices with Rust

PUT – Updating data

Once the data is saved, we might want to provide the ability to modify it. This is a task for the PUT method. Use this method to handle changes to the data:

(&Method::PUT, Some(id)) => {    if let Some(user) = users.get_mut(id) {        *user = UserData;        response_with_code(StatusCode::OK)    } else {        response_with_code(StatusCode::NOT_FOUND)    }},

This code tries to find a user instance in the user database with the get_mut method. This returns a mutable reference wrapped with either a Some option, or a None option if the corresponding value isn't found. We can use a dereference operator, *, to replace the data in the storage.

If the user's data was found and replaced, the branch returns an OK status code. If there's no user with the ...