Review items

crates/bevy_ecs/src/query/fetch.rs

@@ -329,6 +329,19 @@ pub unsafe trait WorldQuery {
     type State: Send + Sync + Sized;
 
     /// Runtime config value passed to [`WorldQuery::init_state`]
+    ///
+    /// This is used to pass runtime information that is necessary to construct
+    /// [`WorldQuery`].
+    ///
+    /// Statically defined queries for types such as `&T` may obtain a
+    /// [`ComponentId`] statically, however, a dynamic query would require that
+    /// [`ComponentId`] is passed at runtime, such that
+    /// `Self::Config = ComponentId`.
+    ///
+    /// [`QueryState::new`](crate::query::state::QueryState::new) can be used when
+    /// `Self::Config: Default` otherwise
+    /// [`QueryState::new_with_config`](crate::query::state::QueryState::new_with_config)
+    /// is used to construct [`QueryState`](crate::query::state::QueryState).
     type Config;
 
     /// This function manually implements subtyping for the query items.

crates/bevy_ecs/src/query/state.rs

@@ -104,7 +104,9 @@ impl<Q: WorldQuery, F: ReadOnlyWorldQuery> QueryState<Q, F> {
         <Q as WorldQuery>::Config: Default,
         <F as WorldQuery>::Config: Default,
     {
-        QueryState::new_with_config(world, Default::default(), Default::default())
+        let fetch_config = Default::default();
+        let filter_config = Default::default();
+        QueryState::new_with_config(world, fetch_config, filter_config)
     }
 
     /// Creates a new [`QueryState`] from a given [`World`], config, and inherits the result of `world.id()`.