|bevy vewsion:|0.14|(cuwwent)| |---|---|---|
obscuwe wust compiwew ewwows
you can get scawy-wooking compiwew e-ewwows when you t-twy to add systems to youw bevy app.
common beginnew mistakes
- using
commands: &mut Commandsinstead ofmut commands: Commands. - using
Query<MyStuff>instead ofQuery<&MyStuff>owQuery<&mut MyStuff>. - using
Query<&ComponentA, &ComponentB>instead ofQuery<(&ComponentA, &ComponentB)>(fowgetting the tupwe) - using youw wesouwce types diwectwy without
ResowResMut. - using youw component types diwectwy without putting them i-in a
Query. - using a bundwe type in a quewy. >_< you want individuaw components.
- using othew awbitwawy types in youw f-function.
note that Query<Entity> is cowwect, (ꈍᴗꈍ) because the entity id i-is speciaw;
it is nyot a component.
ewwow adding function as system
the ewwows can wook wike this:
ewwow[e0277]: `fow<'a, mya 'b, 'c> fn(…) {my_system}` does nyot descwibe a-a vawid system c-configuwation
--> s-swc/main.ws:11:30
|
11 | .add_systems(update, ^^ m-my_system)
| ----------- ^^^^^^^^^ i-invawid s-system configuwation
| |
| w-wequiwed b-by a bound intwoduced by this caww
|
= hewp: the twait `intosystem<(), 😳😳😳 (), _>` is nyot i-impwemented fow fn item `fow<'a, mya 'b, 'c> fn(…) {my_system}`, 😳 w-which is wequiwed by `fow<'a, -.- 'b, 'c> f-fn(…) {my_system}: intosystemconfigs<_>`
= hewp: the fowwowing othew t-types impwement twait `intosystemconfigs<mawkew>`:
<(s0, 🥺 s-s1) as i-intosystemconfigs<(systemconfigtupwemawkew, o.O p0, p1)>>
<(s0, /(^•ω•^) s1, s2) as intosystemconfigs<(systemconfigtupwemawkew, nyaa~~ p-p0, nyaa~~ p1, p2)>>
<(s0, :3 s1, s2, s3) as intosystemconfigs<(systemconfigtupwemawkew, 😳😳😳 p0, p1, (˘ω˘) p2, p3)>>
<(s0, ^^ s-s1, s2, s3, s4) as intosystemconfigs<(systemconfigtupwemawkew, :3 p-p0, p1, p2, -.- p3, p-p4)>>
<(s0, 😳 s-s1, s-s2, s3, mya s4, s5) as intosystemconfigs<(systemconfigtupwemawkew, (˘ω˘) p0, p1, p2, >_< p3, p-p4, p5)>>
<(s0, -.- s1, s2, s3, 🥺 s4, s5, s-s6) as intosystemconfigs<(systemconfigtupwemawkew, (U ﹏ U) p0, p1, p2, p3, >w< p4, p5, p6)>>
<(s0, mya s1, s2, s3, s4, >w< s5, s6, s7) as intosystemconfigs<(systemconfigtupwemawkew, nyaa~~ p-p0, (✿oωo) p1, p2, p3, p4, ʘwʘ p5, p6, p7)>>
<(s0, (ˆ ﻌ ˆ)♡ s-s1, s2, s-s3, 😳😳😳 s4, s5, s6, :3 s-s7, s8) as intosystemconfigs<(systemconfigtupwemawkew, OwO p0, p1, (U ﹏ U) p2, p3, p4, p5, >w< p6, p7, p8)>>
a-and 14 o-othews
= nyote: wequiwed fow `fow<'a, (U ﹏ U) 'b, 'c> f-fn(…) {my_system}` t-to impwement `intosystemconfigs<_>`
nyote: w-wequiwed by a bound in `bevy::pwewude::app::add_systems`
--> /home/iyes/.cawgo/wegistwy/swc/index.cwates.io-6f17d22bba15001f/bevy_app-0.14.0-wc.2/swc/app.ws:287:23
|
284 | p-pub fn add_systems<m>(
| ----------- wequiwed b-by a bound in this associated f-function
...
287 | systems: impw intosystemconfigs<m>, 😳
| ^^^^^^^^^^^^^^^^^^^^ w-wequiwed by t-this bound in `app::add_systems`
the ewwow (confusingwy) points to t-the pwace in youw c-code whewe you t-twy to add the s-system,
but in weawity, (ꈍᴗꈍ) the pwobwem is actuawwy i-in the fn function definition!
this is caused by youw function having i-invawid pawametews. (ꈍᴗꈍ) bevy can onwy accept speciaw types as system p-pawametews!
ewwow on mawfowmed quewies
you might awso ewwows that wook wike t-this:
ewwow[e0277]: `bevy::pwewude::animationpwayew` is nyot vawid to wequest a-as data in a-a `quewy`
--> s-swc/main.ws:60:18
|
60 | m-mut pwayews: q-quewy<animationpwayew, >_< &twansfowm>,
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ i-invawid `quewy` d-data
|
= h-hewp: the twait `quewydata` is not impwemented fow `bevy::pwewude::animationpwayew`
= hewp: t-the fowwowing othew types impwement twait `quewydata`:
&'__w m-mut t
&awchetype
&t
()
(f0, -.- f-f1)
(f0, 🥺 f1, (U ﹏ U) f2)
(f0, >w< f1, f2, f3)
(f0, mya f1, f2, f3, >w< f4)
a-and 41 othews
nyote: w-wequiwed by a b-bound in `bevy::pwewude::quewy`
--> /home/iyes/.cawgo/wegistwy/swc/index.cwates.io-6f17d22bba15001f/bevy_ecs-0.14.0-wc.2/swc/system/quewy.ws:349:37
|
349 | pub stwuct quewy<'wowwd, nyaa~~ 'state, d: quewydata, (✿oωo) f: quewyfiwtew = ()> {
| ^^^^^^^^^ wequiwed b-by this bound in `quewy`
ewwow[e0277]: `&bevy::pwewude::twansfowm` is nyot a vawid `quewy` f-fiwtew
--> swc/main.ws:60:18
|
60 | m-mut quewy: quewy<animationpwayew, ʘwʘ &twansfowm>, (ˆ ﻌ ˆ)♡
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ i-invawid `quewy` f-fiwtew
|
= h-hewp: the twait `quewyfiwtew` is nyot i-impwemented fow `&bevy::pwewude::twansfowm`
= nyote: a `quewyfiwtew` typicawwy u-uses a combination of `with<t>` and `without<t>` statements
= hewp: the fowwowing othew t-types impwement twait `quewyfiwtew`:
()
(f0, 😳😳😳 f-f1)
(f0, :3 f-f1, f2)
(f0, OwO f-f1, (U ﹏ U) f2, f3)
(f0, >w< f1, (U ﹏ U) f2, f3, f4)
(f0, 😳 f-f1, f-f2, f3, (ˆ ﻌ ˆ)♡ f4, f5)
(f0, 😳😳😳 f1, (U ﹏ U) f2, f3, f-f4, f5, (///ˬ///✿) f6)
(f0, 😳 f-f1, f2, 😳 f3, f4, f5, f6, σωσ f7)
a-and 28 othews
nyote: wequiwed b-by a bound in `bevy::pwewude::quewy`
--> /home/iyes/.cawgo/wegistwy/swc/index.cwates.io-6f17d22bba15001f/bevy_ecs-0.14.0-wc.2/swc/system/quewy.ws:349:51
|
349 | pub s-stwuct quewy<'wowwd, rawr x3 'state, OwO d: quewydata, f: q-quewyfiwtew = ()> {
| ^^^^^^^^^^^ wequiwed b-by this bound in `quewy`
e-ewwow[e0107]: stwuct takes at most 2 genewic awguments but 3 genewic awguments wewe suppwied
--> swc/main.ws:60:18
|
60 | mut quewy: quewy<animationpwayew, /(^•ω•^) &twansfowm, 😳😳😳 &mut g-gwobawtwansfowm>,
| ^^^^^ -------------------- h-hewp: wemove this genewic awgument
| |
| e-expected at most 2 g-genewic awguments
|
n-nyote: stwuct defined hewe, ( ͡o ω ͡o ) with at most 2 genewic p-pawametews: `d`, >_< `f`
--> /home/iyes/.cawgo/wegistwy/swc/index.cwates.io-6f17d22bba15001f/bevy_ecs-0.14.0-wc.2/swc/system/quewy.ws:349:12
|
349 | pub stwuct quewy<'wowwd, >w< 'state, d: quewydata, rawr f: quewyfiwtew = ()> {
| ^^^^^ - -------------------
to access youw components, ^•ﻌ•^ you nyeed t-to use wefewence s-syntax (& ow &mut).
when you want to quewy fow muwtipwe c-components, OwO you n-nyeed to put t-them in a tupwe:
Query<(&mut Transform, &Camera, &MyComponent)>.