use_atom_ref with Fermi gives errors

[aimerib]

Problem

When trying to use fermi with a vec atom, the desktop app panics at runtime with error:

thread 'main' panicked at 'No atom root found in context. Did you forget place an AtomRoot component at the top of your app?', /Users/aimeri/.cargo/git/checkouts/dioxus-1e619ce595d3799d/cb7e4f3/packages/fermi/src/hooks/atom_root.rs:10:17

Steps To Reproduce

Here's a simple repro:

Cargo.toml

[package]
name = "fermi-atom-root-repro"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
dioxus = {git = "https://github.com/dioxuslabs/dioxus.git"}
dioxus-desktop = {git = "https://github.com/dioxuslabs/dioxus.git"}
fermi = { git = "https://github.com/dioxuslabs/dioxus.git"}

main.rs

use dioxus::prelude::*;
use dioxus_desktop::{Config, WindowBuilder};
use fermi::*;

fn main() {
    dioxus_desktop::launch_cfg(
        app,
        Config::new()
        .with_window(WindowBuilder::new().with_title("Dioxus"))
        );
}

#[derive(Debug, Clone, Eq, Ord, PartialEq, PartialOrd)]
pub struct Room {
    pub id: u16,
    pub name: String,
    pub description: String,
    pub exits: Vec<String>,
    pub stash: Storage,
    pub room_events: Vec<u16>,
    pub narrative: u16,
    pub subjects: Vec<u16>,
}

#[derive(Debug, Clone, Eq, Ord, PartialEq, PartialOrd, Default)]
pub struct Storage {
    pub items: Vec<String>,
    pub item_ids: Vec<u16>,
}

static ROOMS: AtomRef<Vec<Option<Room>>> = |_| vec![None::<Room>; 81];

pub fn app(cx: Scope) -> Element {
    let rooms = use_atom_ref(cx, ROOMS);

    cx.render(rsx!(
        div {
            rooms.read().iter().map(|f| rsx!{
                if let Some(_) = f {
                    rsx!{
                        div { "hello" }
                    }
                }

            })
        }
    ))
}

NOTE: The fermi.rs example in the main dioxus repository has the exact same behavior, so it also works as a repro for this issue.

Expected behavior

The app should run, and initially I should see nothing on the screen, but if I populated the rooms atom with rooms, I'd see a series of divs with hello on the screen.

Environment:

• Dioxus version: master
• Rust version: nightly
• OS info: MacOS Ventura
• App platform: desktop

[Arhimondus]

Try to add use_init_atom_root(&cx); at the top of the app function. This is due outdated documentation.

[aimerib]

Thank you @Arhimondus!
That worked like a charm!