Derive Macro MapFrom 

#[derive(MapFrom)]
{
    // Attributes available to this derive:
    #[map_from]
    #[map]
}

Derive macro that generates impl From<Source> for Target by mapping struct fields.

Place #[derive(MapFrom)] on your target struct along with #[map_from(SourceType)] to auto-generate the From implementation.

Example

use struct_mapper::MapFrom;

struct UserEntity {
    name: String,
    email: String,
}

#[derive(MapFrom)]
#[map_from(UserEntity)]
struct UserResponse {
    name: String,
    email: String,
}

let entity = UserEntity {
    name: "Khushi".to_string(),
    email: "khushi@gmail.com".to_string(),
};
let response: UserResponse = entity.into();
assert_eq!(response.name, "Khushi");

Field Attributes

Attribute	Description
#[map(from = "name")]	Map from a differently-named source field
#[map(skip, default)]	Skip this field, use Default::default()
#[map(into)]	Call .into() on the source value
#[map(with = "fn_path")]	Apply a custom conversion function

Attributes can be combined: #[map(from = "old_name", with = "convert_fn")] Derive macro that generates impl From<Source> for Target by mapping fields.

Usage

use struct_mapper::MapFrom;

struct UserEntity {
    name: String,
    email: String,
}

#[derive(MapFrom)]
#[map_from(UserEntity)]
struct UserResponse {
    name: String,
    email: String,
}

// Now you can do:
let entity = UserEntity { name: "Alice".into(), email: "a@b.com".into() };
let response: UserResponse = entity.into();

Field Attributes

• #[map(from = "source_field")] — Map from a differently-named source field
• #[map(skip, default)] — Skip this field, use Default::default()
• #[map(into)] — Call .into() on the source field value
• #[map(with = "path::to::fn")] — Apply a custom conversion function