Migrating from 0.2.x to 0.3.0

Reinhardt 0.3.0 removes the remaining 0.2 compatibility APIs and finalizes the Pages, dependency injection, routing, model-info, and migration surfaces that were stabilized through the release-candidate line.

The repository-level instructions/MIGRATION_0.3.md guide remains the source of truth for exhaustive project-maintainer checks.

Recommended Order

Update Cargo.toml to the target 0.3 release.
Replace removed 0.2 compatibility APIs.
Migrate dependency providers that need explicit keyed identity.
Replace raw server route registration with endpoint metadata.
Review generated model-info relation fields and DTO conversions.
Update Pages apps to the split client/server layout.
Regenerate migrations and review the generated diff.
Run the verification commands from the complete guide.

Key Changes

Area	Migration action
Auth extractors	Replace `AuthUser<U>` with `CurrentUser<U>`.
Pages resources	Replace `create_resource*` with `use_resource(fetcher, deps)`.
Effect callbacks	Replace `use_effect_event` with `use_callback` or `.get_untracked()` inside effects.
URL routing	Replace raw `.function(...)`, `.route(...)`, and method handler registration with endpoint macros plus `.endpoint(...)`.
Dependency injection	Use `FactoryOutput<K, T>` and `Depends<K, T>` when the output value type is not a unique dependency identity.
Pages layout	Move route wrappers under app-local `client/components/`, split server/client modules, and use `urls/client_router.rs` plus `urls/server_router.rs`.
Model info	Review relation fields that now expose `RelationInfo<T>` or `ManyToManyInfo<Source, Target>`.
Migrations	Regenerate migrations after relation metadata, field rename, or constraint changes.

Verification

Start with narrow scans so removed API references are visible before running the full project gates:

APP_PATHS="src"
rg -n "AuthUser|create_resource|create_resource_with_deps|use_effect_event|use_effect_event_with" $APP_PATHS
rg -n "\\.(function|route|handler_with_method)(_named)?\\(|FunctionHandler|Depends(Result|Option)" $APP_PATHS
rg -n "pages\\.rs|server_urls|client/pages|src/shared/(forms|types)\\.rs" $APP_PATHS
./scripts/validate-version-markers.sh
git diff --check

Then run the relevant Rust documentation and lint gates:

cargo make fmt-check
cargo make clippy-check
cargo test --doc
cargo doc --no-deps