How does one map a struct to another one in Rust?

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In others languages (like Java), libraries are available for mapping object fields to another object (like mapstruct). It is useful indeed for isolating controller and service from each other.

PersonDto personDto = mapper.businessToDto(personBusiness);

And I can't find how to do it with Rust ? I didn't find any libraries helping with this, or any way to do it. Any resource would be very appreciated !

rust
1 Answers

In rust you usually do it via From trait:

struct Person {
  name: String,
  age: u8,
}

struct PersonDto {
  name: String,
  age: u64,
}

impl From<Person> for PersonDto {
  fn from(p: Person) -> Self {
    Self {
      name: p.name,
      age: p.age.into(),
    }
  }
}

So you can make an Into conversion:

let person = Person { name: "Alex".to_string(), age: 42 };

let person_dto: PersonDto = person.into();
// or via an explicit `T::from:
let person_dto = PersonDto::from(person);
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