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improve error message when asset type hasn't beed added to app (#1487)

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Error message noticed in #1475 

When an asset type hasn't been added to the app but a load was attempted, the error message wasn't helpful:
```
thread 'IO Task Pool (0)' panicked at 'Failed to find AssetLifecycle for label Some("Mesh0/Primitive0"), which has an asset type 8ecbac0f-f545-4473-ad43-e1f4243af51e. Are you sure that is a registered asset type?', /.cargo/git/checkouts/bevy-f7ffde730c324c74/89a41bc/crates/bevy_asset/src/asset_server.rs:435:17
```
means that 
```rust
.add_asset::<bevy::render::prelude::Mesh>()
```
needs to be added.

* type name was not given, only UUID, which may make it hard to identify type across bevy/plugins
* instruction were not helpful as the `register_asset_type` method is not public

new error message:
```
thread 'IO Task Pool (1)' panicked at 'Failed to find AssetLifecycle for label 'Some("Mesh0/Primitive0")', which has an asset type "bevy_render::mesh::mesh::Mesh" (UUID 8ecbac0f-f545-4473-ad43-e1f4243af51e). Are you sure this asset type has been added to your app builder?', /bevy/crates/bevy_asset/src/asset_server.rs:435:17
```
This commit is contained in:
François 2021-03-14 00:36:15 +00:00
parent aa81aaf3fa
commit 86e2fc53d0
2 changed files with 12 additions and 1 deletions
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8
crates/bevy_asset/src/asset_server.rs
View File

@ -435,7 +435,13 @@ impl AssetServer {
AssetPath::new_ref(&load_context.path, label.as_ref().map(|l| l.as_str()));
asset_lifecycle.create_asset(asset_path.into(), asset_value, load_context.version);
} else {
panic!("Failed to find AssetLifecycle for label {:?}, which has an asset type {:?}. Are you sure that is a registered asset type?", label, asset_value.type_uuid());
panic!(
"Failed to find AssetLifecycle for label '{:?}', which has an asset type {} (UUID {:?}). \
Are you sure this asset type has been added to your app builder?",
label,
asset_value.type_name(),
asset_value.type_uuid(),
);
}
}
}

5
crates/bevy_reflect/src/type_uuid.rs
View File

@ -7,6 +7,7 @@ pub trait TypeUuid {
pub trait TypeUuidDynamic {
fn type_uuid(&self) -> Uuid;
fn type_name(&self) -> &'static str;
}
impl<T> TypeUuidDynamic for T
@ -16,4 +17,8 @@ where
fn type_uuid(&self) -> Uuid {
Self::TYPE_UUID
}
fn type_name(&self) -> &'static str {
std::any::type_name::<Self>()
}
}