Leptos example : Struct (not working)

main.rs

use leptos::prelude::*;

fn main() {
    mount_to_body(|| view! { <App /> });
}

#[derive(Debug, Clone)]
struct Something {
    // Will us it as identifier
    name: String,
    attr: SomeAttr,
}

#[derive(Debug, Clone)]
struct SomeAttr(usize);

#[component]
fn App() -> impl IntoView {
    let (things, set_things) = signal(vec![
        (
            "Foo1".to_string(),
            ArcRwSignal::new(Something {
                name: "Foo1".to_string(),
                attr: SomeAttr(42),
            }),
        ),
        (
            "Foo2".to_string(),
            ArcRwSignal::new(Something {
                name: "Foo1".to_string(),
                attr: SomeAttr(24),
            }),
        ),
    ]);

    view! {
        <button on:click=move |_| simulate_network(set_things)>trigger</button>
        <Things things />
    }
}

#[component]
fn Things(things: ReadSignal<Vec<(String, ArcRwSignal<Something>)>>) -> impl IntoView {
    view! {
        <ul>
            <For
                each=move || things.get()
                key=|thing| thing.0.clone()
                children=move |(_, thing)| {
                    let thing = RwSignal::from(thing);

                    view! {
                        <li>
                            <Thing thing />
                        </li>
                    }
                }
            />
        </ul>
    }
}

#[component]
fn Thing(thing: RwSignal<Something>) -> impl IntoView {
    let name = move || thing.get().name;
    let attr = thing.get().attr;

    view! {
        <span>{name}</span>
        " "
        <Attr attr/>
    }
}

#[component]
fn Attr(attr: SomeAttr) -> impl IntoView {
    let value = attr.0;

    view! { {value} }
}

fn simulate_network(things: WriteSignal<Vec<(String, ArcRwSignal<Something>)>>) {
    things.update(|things| {
        if let Some((_, thing)) = things.iter().find(|(thing_name, _)| thing_name == "Foo2") {
            thing.update(|thing| thing.attr = SomeAttr(128));
        }
    });
}