{"record":{"id":"00ce81d3a628c9a8","repo":"bevyengine/bevy","slug":"subasset-type-does-not-have-reflectfromptr-registered-in-its","errorCode":null,"errorMessage":"Subasset type does not have ReflectFromPtr registered in its type data","messagePattern":"Subasset type does not have ReflectFromPtr registered in its type data","errorType":"exception","errorClass":"ReflectedRonSerializeError::MissingReflectFromPtr","httpStatus":null,"severity":"error","filePath":"crates/bevy_asset/src/common_loaders/ron.rs","lineNumber":481,"sourceCode":"/// An error type for RON saving.\n#[derive(Error, Debug)]\npub enum RonSerializeError {\n    #[error(transparent)]\n    IoError(#[from] std::io::Error),\n    #[error(transparent)]\n    Ron(#[from] ron::Error),\n}\n\n/// An error type for RON saving using reflection.\n#[derive(Error, Debug)]\npub enum ReflectedRonSerializeError {\n    #[error(\n        \"Expected the root LoadedUntypedHandle to hold a handle to its subasset, but it did not have such a subasset\"\n    )]\n    MissingSubasset,\n    #[error(\"Subasset type was not registered in the TypeRegistry. Ensure your subasset's type implements Reflect (and if it's generic it needs to be manually registered)\")]\n    ValueNotReflect,\n    #[error(\"Subasset type does not have ReflectFromPtr registered in its type data\")]\n    MissingReflectFromPtr,\n    #[error(transparent)]\n    Ron(#[from] RonSerializeError),\n}\n\n#[cfg(test)]\nmod tests {\n    use std::path::Path;\n\n    use alloc::{string::String, vec};\n\n    use bevy_ecs::reflect::AppTypeRegistry;\n    use bevy_reflect::{Reflect, TypePath};\n    use bevy_tasks::{futures::check_ready, IoTaskPool};\n    use serde::{Deserialize, Serialize};\n\n    use crate::{\n        common_loaders::ron::{","sourceCodeStart":463,"sourceCodeEnd":499,"githubUrl":"https://github.com/bevyengine/bevy/blob/a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2/crates/bevy_asset/src/common_loaders/ron.rs#L463-L499","documentation":"ReflectedRonSerializeError::MissingReflectFromPtr is thrown when the subasset type's registry entry lacks the ReflectFromPtr type data. During serialization Bevy holds the value behind a raw pointer and needs ReflectFromPtr to safely convert it to a &dyn Reflect of the concrete type.","triggerScenarios":"Saving a reflected RON asset for a type that was registered (register_type) but whose ReflectFromPtr type data is missing — e.g. registration done without the standard derive/registration macro flow.","commonSituations":"Manually building TypeRegistry entries and skipping type data; types registered via get_type_registry with partial registration.","solutions":["Register the type through app.register_type::<T>() which attaches ReflectFromPtr automatically","If building registry entries manually, add registry.get_mut(TypeId).insert(ReflectFromPtr::from_type::<T>())","Re-derive Reflect via the standard macro so required type data is generated"],"exampleFix":"// before\nlet mut registry = TypeRegistry::default();\nregistry.register::<T>();\n\n// after\nlet mut registry = TypeRegistry::default();\nregistry.register::<T>();\nregistry.get_mut(TypeId::of::<T>()).unwrap().insert(ReflectFromPtr::from_type::<T>());","handlingStrategy":"validation","validationCode":"fn has_reflect_from_ptr(registry: &TypeRegistry, ty: TypeId) -> bool {\n    registry.get(ty).map_or(false, |r| r.data::<ReflectFromPtr>().is_some())\n}","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Use register_type rather than manual registry entries","Derive Reflect via the standard macro so type data is generated"],"tags":["bevy","assets","reflection","serialization"],"backgroundTag":"missing-type-registration","analyzedSha":"a62cce8c05ceacd3bd102e678c83e2b42e5dfbe2","analyzedAt":"2026-09-19T21:23:06.616Z","contentChangedAt":"2026-09-19T21:23:06.616Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}