Changing WorldQuery to ReadOnlyWorldQuery as per bevyengine#6005.

crates/bevy_ecs/src/lib.rs

@@ -57,7 +57,9 @@ mod tests {
         bundle::Bundle,
         component::{Component, ComponentId},
         entity::Entity,
-        query::{Added, ChangeTrackers, Changed, FilteredAccess, With, Without, WorldQuery},
+        query::{
+            Added, ChangeTrackers, Changed, FilteredAccess, ReadOnlyWorldQuery, With, Without,
+        },
         system::Resource,
         world::{Mut, World},
     };
@@ -902,7 +904,7 @@ mod tests {
             }
         }
 
-        fn get_filtered<F: WorldQuery>(world: &mut World) -> Vec<Entity> {
+        fn get_filtered<F: ReadOnlyWorldQuery>(world: &mut World) -> Vec<Entity> {
             world
                 .query_filtered::<Entity, F>()
                 .iter(world)

crates/bevy_ecs/src/query/iter.rs

@@ -13,14 +13,14 @@ use super::{QueryFetch, QueryItem, ReadOnlyWorldQuery};
 ///
 /// This struct is created by the [`Query::iter`](crate::system::Query::iter) and
 /// [`Query::iter_mut`](crate::system::Query::iter_mut) methods.
-pub struct QueryIter<'w, 's, Q: WorldQuery, F: WorldQuery> {
+pub struct QueryIter<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> {
     tables: &'w Tables,
     archetypes: &'w Archetypes,
     query_state: &'s QueryState<Q, F>,
     cursor: QueryIterationCursor<'w, 's, Q, F>,
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> QueryIter<'w, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> QueryIter<'w, 's, Q, F> {
     /// # Safety
     /// This does not check for mutable query correctness. To be safe, make sure mutable queries
     /// have unique access to the components they query.
@@ -41,7 +41,7 @@ impl<'w, 's, Q: WorldQuery, F: WorldQuery> QueryIter<'w, 's, Q, F> {
     }
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> Iterator for QueryIter<'w, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Iterator for QueryIter<'w, 's, Q, F> {
     type Item = QueryItem<'w, Q>;
 
     #[inline(always)]
@@ -70,12 +70,12 @@ impl<'w, 's, Q: WorldQuery, F: WorldQuery> Iterator for QueryIter<'w, 's, Q, F>
 }
 
 // This is correct as [`QueryIter`] always returns `None` once exhausted.
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> FusedIterator for QueryIter<'w, 's, Q, F> {}
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> FusedIterator for QueryIter<'w, 's, Q, F> {}
 
 /// An [`Iterator`] over [`Query`](crate::system::Query) results of a list of [`Entity`]s.
 ///
 /// This struct is created by the [`Query::iter_many`](crate::system::Query::iter_many) and [`Query::iter_many_mut`](crate::system::Query::iter_many_mut) methods.
-pub struct QueryManyIter<'w, 's, Q: WorldQuery, F: WorldQuery, I: Iterator>
+pub struct QueryManyIter<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery, I: Iterator>
 where
     I::Item: Borrow<Entity>,
 {
@@ -88,7 +88,7 @@ where
     query_state: &'s QueryState<Q, F>,
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery, I: Iterator> QueryManyIter<'w, 's, Q, F, I>
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery, I: Iterator> QueryManyIter<'w, 's, Q, F, I>
 where
     I::Item: Borrow<Entity>,
 {
@@ -267,14 +267,16 @@ where
 /// [`Query`]: crate::system::Query
 /// [`Query::iter_combinations`]: crate::system::Query::iter_combinations
 /// [`Query::iter_combinations_mut`]: crate::system::Query::iter_combinations_mut
-pub struct QueryCombinationIter<'w, 's, Q: WorldQuery, F: WorldQuery, const K: usize> {
+pub struct QueryCombinationIter<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery, const K: usize> {
     tables: &'w Tables,
     archetypes: &'w Archetypes,
     query_state: &'s QueryState<Q, F>,
     cursors: [QueryIterationCursor<'w, 's, Q, F>; K],
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery, const K: usize> QueryCombinationIter<'w, 's, Q, F, K> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery, const K: usize>
+    QueryCombinationIter<'w, 's, Q, F, K>
+{
     /// # Safety
     /// This does not check for mutable query correctness. To be safe, make sure mutable queries
     /// have unique access to the components they query.
@@ -436,7 +438,7 @@ where
     }
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> ExactSizeIterator for QueryIter<'w, 's, Q, F>
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> ExactSizeIterator for QueryIter<'w, 's, Q, F>
 where
     F: ArchetypeFilter,
 {
@@ -473,7 +475,7 @@ where
 {
 }
 
-struct QueryIterationCursor<'w, 's, Q: WorldQuery, F: WorldQuery> {
+struct QueryIterationCursor<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> {
     table_id_iter: std::slice::Iter<'s, TableId>,
     archetype_id_iter: std::slice::Iter<'s, ArchetypeId>,
     fetch: QueryFetch<'w, Q>,
@@ -485,7 +487,7 @@ struct QueryIterationCursor<'w, 's, Q: WorldQuery, F: WorldQuery> {
     phantom: PhantomData<Q>,
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> Clone for QueryIterationCursor<'w, 's, Q, F>
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Clone for QueryIterationCursor<'w, 's, Q, F>
 where
     QueryFetch<'w, Q>: Clone,
     QueryFetch<'w, F>: Clone,
@@ -503,7 +505,7 @@ where
     }
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> QueryIterationCursor<'w, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> QueryIterationCursor<'w, 's, Q, F> {
     const IS_DENSE: bool = Q::IS_DENSE && F::IS_DENSE;
 
     unsafe fn init_empty(

crates/bevy_ecs/src/query/mod.rs

@@ -19,7 +19,7 @@ pub(crate) unsafe fn debug_checked_unreachable() -> ! {
 
 #[cfg(test)]
 mod tests {
-    use super::WorldQuery;
+    use super::{ReadOnlyWorldQuery, WorldQuery};
     use crate::prelude::{AnyOf, Entity, Or, QueryState, With, Without};
     use crate::query::{ArchetypeFilter, QueryCombinationIter, QueryFetch};
     use crate::system::{IntoSystem, Query, System, SystemState};
@@ -68,7 +68,7 @@ mod tests {
         fn assert_combination<Q, F, const K: usize>(world: &mut World, expected_size: usize)
         where
             Q: WorldQuery,
-            F: WorldQuery,
+            F: ReadOnlyWorldQuery,
             F::ReadOnly: ArchetypeFilter,
             for<'w> QueryFetch<'w, Q::ReadOnly>: Clone,
             for<'w> QueryFetch<'w, F::ReadOnly>: Clone,
@@ -81,7 +81,7 @@ mod tests {
         fn assert_all_sizes_equal<Q, F>(world: &mut World, expected_size: usize)
         where
             Q: WorldQuery,
-            F: WorldQuery,
+            F: ReadOnlyWorldQuery,
             F::ReadOnly: ArchetypeFilter,
             for<'w> QueryFetch<'w, Q::ReadOnly>: Clone,
             for<'w> QueryFetch<'w, F::ReadOnly>: Clone,

crates/bevy_ecs/src/query/state.rs

@@ -13,14 +13,14 @@ use bevy_utils::tracing::Instrument;
 use fixedbitset::FixedBitSet;
 use std::{borrow::Borrow, fmt};
 
-use super::{NopWorldQuery, QueryItem, QueryManyIter, ROQueryItem};
+use super::{NopWorldQuery, QueryItem, QueryManyIter, ROQueryItem, ReadOnlyWorldQuery};
 
 /// Provides scoped access to a [`World`] state according to a given [`WorldQuery`] and query filter.
 #[repr(C)]
 // SAFETY NOTE:
 // Do not add any new fields that use the `Q` or `F` generic parameters as this may
 // make `QueryState::as_transmuted_state` unsound if not done with care.
-pub struct QueryState<Q: WorldQuery, F: WorldQuery = ()> {
+pub struct QueryState<Q: WorldQuery, F: ReadOnlyWorldQuery = ()> {
     world_id: WorldId,
     pub(crate) archetype_generation: ArchetypeGeneration,
     pub(crate) matched_tables: FixedBitSet,
@@ -35,13 +35,13 @@ pub struct QueryState<Q: WorldQuery, F: WorldQuery = ()> {
     pub(crate) filter_state: F::State,
 }
 
-impl<Q: WorldQuery, F: WorldQuery> FromWorld for QueryState<Q, F> {
+impl<Q: WorldQuery, F: ReadOnlyWorldQuery> FromWorld for QueryState<Q, F> {
     fn from_world(world: &mut World) -> Self {
         world.query_filtered()
     }
 }
 
-impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
+impl<Q: WorldQuery, F: ReadOnlyWorldQuery> QueryState<Q, F> {
     /// Converts this `QueryState` reference to a `QueryState` that does not access anything mutably.
     pub fn as_readonly(&self) -> &QueryState<Q::ReadOnly, F::ReadOnly> {
         // SAFETY: invariant on `WorldQuery` trait upholds that `Q::ReadOnly` and `F::ReadOnly`
@@ -71,15 +71,15 @@ impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
     /// `NewF` must have a subset of the access that `F` does and match the exact same archetypes/tables
     pub(crate) unsafe fn as_transmuted_state<
         NewQ: WorldQuery<State = Q::State>,
-        NewF: WorldQuery<State = F::State>,
+        NewF: ReadOnlyWorldQuery<State = F::State>,
     >(
         &self,
     ) -> &QueryState<NewQ, NewF> {
         &*(self as *const QueryState<Q, F> as *const QueryState<NewQ, NewF>)
     }
 }
 
-impl<Q: WorldQuery, F: WorldQuery> QueryState<Q, F> {
+impl<Q: WorldQuery, F: ReadOnlyWorldQuery> QueryState<Q, F> {
     /// Creates a new [`QueryState`] from a given [`World`] and inherits the result of `world.id()`.
     pub fn new(world: &mut World) -> Self {
         let fetch_state = Q::init_state(world);

crates/bevy_ecs/src/system/query.rs

@@ -273,14 +273,14 @@ use std::{any::TypeId, borrow::Borrow, fmt::Debug};
 /// [`Table`]: crate::storage::Table
 /// [`With`]: crate::query::With
 /// [`Without`]: crate::query::Without
-pub struct Query<'world, 'state, Q: WorldQuery, F: WorldQuery = ()> {
+pub struct Query<'world, 'state, Q: WorldQuery, F: ReadOnlyWorldQuery = ()> {
     pub(crate) world: &'world World,
     pub(crate) state: &'state QueryState<Q, F>,
     pub(crate) last_change_tick: u32,
     pub(crate) change_tick: u32,
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> Query<'w, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> Query<'w, 's, Q, F> {
     /// Creates a new query.
     ///
     /// # Safety
@@ -1380,7 +1380,7 @@ impl<'w, 's, Q: WorldQuery, F: WorldQuery> Query<'w, 's, Q, F> {
     }
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> IntoIterator for &'w Query<'_, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> IntoIterator for &'w Query<'_, 's, Q, F> {
     type Item = ROQueryItem<'w, Q>;
     type IntoIter = QueryIter<'w, 's, Q::ReadOnly, F::ReadOnly>;
 
@@ -1389,7 +1389,7 @@ impl<'w, 's, Q: WorldQuery, F: WorldQuery> IntoIterator for &'w Query<'_, 's, Q,
     }
 }
 
-impl<'w, 's, Q: WorldQuery, F: WorldQuery> IntoIterator for &'w mut Query<'_, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery, F: ReadOnlyWorldQuery> IntoIterator for &'w mut Query<'_, 's, Q, F> {
     type Item = QueryItem<'w, Q>;
     type IntoIter = QueryIter<'w, 's, Q, F>;
 
@@ -1434,7 +1434,7 @@ impl std::fmt::Display for QueryComponentError {
     }
 }
 
-impl<'w, 's, Q: ReadOnlyWorldQuery, F: WorldQuery> Query<'w, 's, Q, F> {
+impl<'w, 's, Q: ReadOnlyWorldQuery, F: ReadOnlyWorldQuery> Query<'w, 's, Q, F> {
     /// Returns the query item for the given [`Entity`], with the actual "inner" world lifetime.
     ///
     /// In case of a nonexisting entity or mismatched component, a [`QueryEntityError`] is

crates/bevy_ecs/src/system/system_param.rs

@@ -135,16 +135,21 @@ pub trait SystemParamFetch<'world, 'state>: SystemParamState {
     ) -> Self::Item;
 }
 
-impl<'w, 's, Q: WorldQuery + 'static, F: WorldQuery + 'static> SystemParam for Query<'w, 's, Q, F> {
+impl<'w, 's, Q: WorldQuery + 'static, F: ReadOnlyWorldQuery + 'static> SystemParam
+    for Query<'w, 's, Q, F>
+{
     type Fetch = QueryState<Q, F>;
 }
 
 // SAFETY: QueryState is constrained to read-only fetches, so it only reads World.
-unsafe impl<Q: ReadOnlyWorldQuery, F: WorldQuery> ReadOnlySystemParamFetch for QueryState<Q, F> {}
+unsafe impl<Q: ReadOnlyWorldQuery, F: ReadOnlyWorldQuery> ReadOnlySystemParamFetch
+    for QueryState<Q, F>
+{
+}
 
 // SAFETY: Relevant query ComponentId and ArchetypeComponentId access is applied to SystemMeta. If
 // this QueryState conflicts with any prior access, a panic will occur.
-unsafe impl<Q: WorldQuery + 'static, F: WorldQuery + 'static> SystemParamState
+unsafe impl<Q: WorldQuery + 'static, F: ReadOnlyWorldQuery + 'static> SystemParamState
     for QueryState<Q, F>
 {
     fn init(world: &mut World, system_meta: &mut SystemMeta) -> Self {
@@ -174,7 +179,7 @@ unsafe impl<Q: WorldQuery + 'static, F: WorldQuery + 'static> SystemParamState
     }
 }
 
-impl<'w, 's, Q: WorldQuery + 'static, F: WorldQuery + 'static> SystemParamFetch<'w, 's>
+impl<'w, 's, Q: WorldQuery + 'static, F: ReadOnlyWorldQuery + 'static> SystemParamFetch<'w, 's>
     for QueryState<Q, F>
 {
     type Item = Query<'w, 's, Q, F>;
@@ -1595,7 +1600,7 @@ mod tests {
     use super::SystemParam;
     use crate::{
         self as bevy_ecs, // Necessary for the `SystemParam` Derive when used inside `bevy_ecs`.
-        query::WorldQuery,
+        query::{ReadOnlyWorldQuery, WorldQuery},
         system::Query,
     };
 
@@ -1605,7 +1610,7 @@ mod tests {
         'w,
         's,
         Q: WorldQuery + Send + Sync + 'static,
-        F: WorldQuery + Send + Sync + 'static = (),
+        F: ReadOnlyWorldQuery + Send + Sync + 'static = (),
     > {
         _query: Query<'w, 's, Q, F>,
     }

crates/bevy_ecs/src/world/mod.rs

@@ -16,7 +16,7 @@ use crate::{
         StorageType,
     },
     entity::{AllocAtWithoutReplacement, Entities, Entity},
-    query::{QueryState, WorldQuery},
+    query::{QueryState, ReadOnlyWorldQuery, WorldQuery},
     storage::{Column, SparseSet, Storages},
     system::Resource,
 };
@@ -610,7 +610,7 @@ impl World {
     /// assert_eq!(matching_entities, vec![e2]);
     /// ```
     #[inline]
-    pub fn query_filtered<Q: WorldQuery, F: WorldQuery>(&mut self) -> QueryState<Q, F> {
+    pub fn query_filtered<Q: WorldQuery, F: ReadOnlyWorldQuery>(&mut self) -> QueryState<Q, F> {
         QueryState::new(self)
     }
 

crates/bevy_ui/src/flex/mod.rs

@@ -4,7 +4,7 @@ use crate::{CalculatedSize, Node, Style, UiScale};
 use bevy_ecs::{
     entity::Entity,
     event::EventReader,
-    query::{Changed, With, Without, WorldQuery},
+    query::{Changed, ReadOnlyWorldQuery, With, Without},
     system::{Query, RemovedComponents, Res, ResMut, Resource},
 };
 use bevy_hierarchy::{Children, Parent};
@@ -234,7 +234,7 @@ pub fn flex_node_system(
         update_changed(&mut flex_surface, scale_factor, node_query);
     }
 
-    fn update_changed<F: WorldQuery>(
+    fn update_changed<F: ReadOnlyWorldQuery>(
         flex_surface: &mut FlexSurface,
         scaling_factor: f64,
         query: Query<(Entity, &Style, Option<&CalculatedSize>), F>,