derive-build

An opinionated builder macro in Rust

#[derive(Default, Build, Eq, PartialEq, Debug)]
struct Request {
    #[required]
    url: String,

    path: Option<String>,

    messages: Vec<String>,
}

fn main() {
    let request = Request::new("example.com")
        .path("tester")
        .message("hello")
        .message("goodbye");

    let expected = Request {
        url: "example.com".to_string(),
        path: Some("tester".to_string()),
        messages: vec!["hello".to_string(), "goodbye".to_string()],
    };

    assert_eq!(request, expected);
}

Features

• Required fields
• Optional fields
• Default values for optional fields
• Default values for required fields (instead make option)
• Support for Option<T> fields
• Support for Vec<T> fields
• Support for Cow<'a, T> fields
• Support for references (&'a T) fields
• Automatic Into<T> conversions
• Automatic singularization of field names
• Support for HashMap<K, V> fields
• Support for HashSet<T> fields
• Support for BTreeMap<K, V> fields
• Support for BTreeSet<T> fields
• Support for Box<T> fields
• Support for Rc<T> fields
• Support for Arc<T> fields
• Support for integer types