Turn `QueryState` to `Query` | Bevy | Page 1

woven vortex Oct 18, 2022, 10:30 AM

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I'm trying to pass queries down to single functions to avoid passing the whole &mut World and keep at least a bit of encapsulation. I've only found .query() and .query_filtered(), which return QueryStates, and that kind of defeats the point. Any ideas?

distant lily Oct 18, 2022, 10:33 AM

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SystemState helps! Also you can convert query state into query using a method on querystate

woven vortex Oct 18, 2022, 10:39 AM

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and what would be the method on querystate?

distant lily Oct 18, 2022, 10:42 AM

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Uh I was looking this up the other day... On my phone ATM, but I'll try to find out once I'm up for the day

woven vortex Oct 18, 2022, 10:45 AM

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maybe get_param?

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but that has a scary safety note

distant lily Oct 18, 2022, 11:58 AM

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woven vortex and what would be the method on querystate?

Nope, I misremembered, doesn't seem to exist. Instead, construct your queries using https://docs.rs/bevy/latest/bevy/ecs/system/struct.SystemState.html

SystemState in bevy::ecs::system - Rust

Holds on to persistent state required to drive [SystemParam] for a [System].

#Turn `QueryState` to `Query`