Add panicking helpers for getting components from Query (#9659)

# Objective

- Currently we don't have panicking alternative for getting components
from `Query` like for resources. Partially addresses #9443.

## Solution

- Add these functions.

---

## Changelog

### Added

- `Query::component` and `Query::component_mut` to get specific
component from query and panic on error.

crates/bevy_ecs/src/system/query.rs

@@ -1091,6 +1091,7 @@ impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Query<'w, 's, Q, F> {
  ///
  /// # See also
  ///
+ /// - [`component`](Self::component) a panicking version of this function.
  /// - [`get_component_mut`](Self::get_component_mut) to get a mutable reference of a component.
  #[inline]
  pub fn get_component<T: Component>(&self, entity: Entity) -> Result<&T, QueryComponentError> {
@@ -1121,7 +1122,7 @@ impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Query<'w, 's, Q, F> {
 
  /// Returns a mutable reference to the component `T` of the given entity.
  ///
- /// In case of a nonexisting entity or mismatched component, a [`QueryComponentError`] is returned instead.
+ /// In case of a nonexisting entity, mismatched component or missing write acess, a [`QueryComponentError`] is returned instead.
  ///
  /// # Example
  ///
@@ -1145,6 +1146,7 @@ impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Query<'w, 's, Q, F> {
  ///
  /// # See also
  ///
+ /// - [`component_mut`](Self::component_mut) a panicking version of this function.
  /// - [`get_component`](Self::get_component) to get a shared reference of a component.
  #[inline]
  pub fn get_component_mut<T: Component>(
@@ -1155,6 +1157,54 @@ impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Query<'w, 's, Q, F> {
  unsafe { self.get_component_unchecked_mut(entity) }
  }
 
+ /// Returns a shared reference to the component `T` of the given [`Entity`].
+ ///
+ /// # Panics
+ ///
+ /// Panics in case of a nonexisting entity or mismatched component.
+ ///
+ /// # See also
+ ///
+ /// - [`get_component`](Self::get_component) a non-panicking version of this function.
+ /// - [`component_mut`](Self::component_mut) to get a mutable reference of a component.
+ #[inline]
+ #[track_caller]
+ pub fn component<T: Component>(&self, entity: Entity) -> &T {
+ match self.get_component(entity) {
+ Ok(component) => component,
+ Err(error) => {
+ panic!(
+ "Cannot get component `{:?}` from {entity:?}: {error}",
+ TypeId::of::<T>()
+ )
+ }
+ }
+ }
+
+ /// Returns a mutable reference to the component `T` of the given entity.
+ ///
+ /// # Panics
+ ///
+ /// Panics in case of a nonexisting entity, mismatched component or missing write access.
+ ///
+ /// # See also
+ ///
+ /// - [`get_component_mut`](Self::get_component_mut) a non-panicking version of this function.
+ /// - [`component`](Self::component) to get a shared reference of a component.
+ #[inline]
+ #[track_caller]
+ pub fn component_mut<T: Component>(&mut self, entity: Entity) -> Mut<'_, T> {
+ match self.get_component_mut(entity) {
+ Ok(component) => component,
+ Err(error) => {
+ panic!(
+ "Cannot get component `{:?}` from {entity:?}: {error}",
+ TypeId::of::<T>()
+ )
+ }
+ }
+ }
+
  /// Returns a mutable reference to the component `T` of the given entity.
  ///
  /// In case of a nonexisting entity or mismatched component, a [`QueryComponentError`] is returned instead.