Trait bound errors after adding Arc to one of my Substates

[fetzsav]

I thought I understood the state system until I am trying to make one of my substates mutable by adding Arc<Mutex<>>.

After adding Arc<>, I am getting a trait bound error on all my routes which do not even access this substate.

I have tried using the debug macro, but do not get any more helpful error.

Here is my state:

#[derive(Clone)]
pub struct AppState {
    pub pool: Arc<Pool>,
    pub app_settings: Arc<AppSettings>,
}

impl FromRef<AppState> for Arc<Pool> {
    fn from_ref(app_state: &AppState) -> Arc<Pool> {
        app_state.pool.clone()
    }
}

impl FromRef<AppState> for Arc<AppSettings> {
    fn from_ref(app_state: &AppState) -> Arc<AppSettings> {
        app_state.app_settings.clone()
    }
}

And here is the error:

`the trait bound `Arc<deadpool::managed::Pool<Manager>>: FromRef<AppSettings>` is not satisfied
the trait `FromRef<AppState>` is implemented for `Arc<deadpool::managed::Pool<Manager>>`
required for `State<Arc<deadpool::managed::Pool<Manager>>>` to implement `FromRequestParts<AppSettings>`
required for `fn(State<Arc<Pool<Manager>>>, Json<SmallPollBody>) -> impl Future<Output = Result<Json<...>, ...>> {smallpoll}` to implement `Handler<(axum_core::extract::private::ViaRequest, State<Arc<deadpool::managed::Pool<Manager>>>, axum::Json<SmallPollBody>), AppSettings, _>`
the full type name has been written to '/home/fetz/proj/crusty/server/target/debug/deps/crustyloader-1f05754ba2c8061c.long-type-4694310901660505807.txt'

My signature for the handler just looks like this:

#[debug_handler]
pub async fn smallpoll(
    State(pool): State<Arc<Pool>>,
    Json(req): Json<SmallPollBody>,
) -> Result<Json<PollResponseBody>, DatabaseErrors> {

[davidpdrsn]

This is because of https://docs.rs/axum/latest/axum/attr.debug_handler.html#changing-state-type. #[debug_handler] infers your state to be Arc<Pool> which isn't general enough. You wanna set it to AppState