Derive TryFrom<HashMap<String, String>> for a struct.

This macro will generate an implementation of TryFrom<HashMap<String, String>> for the annotated struct. It will attempt to parse each field from the map, and return an error if any field is missing or cannot be parsed. Fields of type Option<T> are supported, and will be set to None if the field is missing from the map.

Currently, only supports structs with named fields that implement FromStr. Accepting all types that implement serde::Deserialize is a future goal.

Example

use try_from_map::TryFromMap;
#[derive(TryFromMap, Debug)]
struct Foo {
   a: i32,
   b: f32,
   c: Option<bool>,
}

let map = std::collections::HashMap::from([
    ("a".to_string(), "42".to_string()),
    ("b".to_string(), "3.14".to_string()),
]);

let foo = Foo::try_from(map).unwrap();

println!("{:?}", foo);

assert_eq!(foo.a, 42);
assert_eq!(foo.b, 3.14);
assert_eq!(foo.c, None);

try-from-map 0.2.0

Example