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Mention world_query(ignore) attribute for WorldQuery derivation (#6309)
# Objective
Add documentation `#[world_query(ignore)]`. Fixes #6283.
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I've only described it's behavior so far (which appears to be the same as with `system_param`). Is there another use-case for this besides with `PhantomData`? I could only find a single usage of this construct on GitHub, which is [here](ffcb816927/bevy/examples/ecs/custom_query_param.rs (L102)
).
I was also wondering if it would make sense to add a usage example to the `custom_query_example`? 🤔 That's why it's currently still in there.
Co-authored-by: Lucas Jenß <243719+x3ro@users.noreply.github.com>
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@ -55,7 +55,13 @@ use std::{cell::UnsafeCell, marker::PhantomData};
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/// - Methods can be implemented for the query items.
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/// - There is no hardcoded limit on the number of elements.
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///
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/// This trait can only be derived if each field of the struct also implements `WorldQuery`.
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/// This trait can only be derived if each field either
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///
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/// * also implements `WorldQuery`, or
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/// * is marked with `#[world_query(ignore)]`. Fields decorated with this attribute
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/// must implement [`Default`] and will be initialized to the default value as defined
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/// by the trait.
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///
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/// The derive macro only supports regular structs (structs with named fields).
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///
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/// ```
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