HashMap :: get에서 반환 된 Some의 값을 어떻게 변경할 수 있습니까?

Question

나는 Some에 의해 반환 된 값을 수정하는 방법을 알아낼 수 없습니다 :

fn add_employee(
    employees: &mut HashMap<String, Vec<String>>, 
    employee_name: &String, 
    department_name: &String, 
) { 
    match employees.get(department_name) { 
     Some(members) => { 
      members.push(employee_name.clone()); // what I want, but it doesn't work 
     } 
     None => {} 
    } 
} 

컴파일러는 불평 :

error[E0596]: cannot borrow immutable borrowed content `*members` as mutable 
    --> src/main.rs:10:13 
    | 
10 |    members.push(employee_name.clone()); 
    |    ^^^^^^^ cannot borrow as mutable 

Answer 1

사용 get_mut() 대신 get().