facebook/relay · error

User is an object

Error message

User is an object

What it means

Test assertion in preserves_source_locations: get_object_id on the User type must succeed, i.e. User must be an object type. Firing means User resolved to a non-object kind (interface/union/scalar) or the object id lookup failed in the in-memory schema build.

Source

Thrown at compiler/crates/schema-set/src/build_in_memory_schema.rs:751

        extension_sdl: &str,
        extension_source: SourceLocationKey,
    ) -> DiagnosticsResult<SchemaSet> {
        SchemaSet::from_schema_documents_with_extensions(
            &[parse_schema_document(base_sdl, base_source).unwrap()],
            &[parse_schema_document(extension_sdl, extension_source).unwrap()],
        )
    }

    #[test]
    fn preserves_source_locations() {
        let sdl = "type Query { me: User }\n\ntype User { id: ID name: String }";
        let source = SourceLocationKey::standalone("user.graphql");
        let schema = build_in_memory_schema(&schema_set_from(sdl, source)).unwrap();

        // The `User` type's name points back at the original source file, not a
        // generated location — this is the whole purpose of the direct build.
        let user_type = schema.get_type("User".intern()).expect("User type exists");
        let user = schema.object(user_type.get_object_id().expect("User is an object"));
        assert_eq!(user.name.location.source_location(), source);
        assert_ne!(user.name.location, Location::generated());

        // Field locations are preserved too.
        let id_field_id = schema
            .named_field(user_type, "id".intern())
            .expect("User.id exists");
        let id_field = schema.field(id_field_id);
        assert_eq!(id_field.name.location.source_location(), source);
        assert_ne!(id_field.name.location, Location::generated());

        // Sanity: the schema is structurally usable (root + resolved field type).
        assert!(schema.query_type().is_some());
        assert!(matches!(id_field.type_, schema::TypeReference::Named(_)));
    }

    #[test]
    fn resolves_builtin_scalars_and_defaults() {

View on GitHub (pinned to 668b1b85e0)

Solutions

1. Verify the fixture defines User as an object type
2. Check SchemaData object id resolution for the built schema

When it happens

Trigger: Thrown at compiler/crates/schema-set/src/build_in_memory_schema.rs:751 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of facebook/relay@668b1b85e0 (2026-09-02). Data as JSON: /api/errors/8ac31df12815e177. Report an issue: GitHub.