How can I elide a Result<T> type in Microsoft.AspNetCore.OpenApi

[slang25]

Can anyone help me find the best approach for the following problem with the newer OpenAPI document generation in aspnetcore.

We have a custom generic result type, Result<T>, and we would like our endpoints to be documented, but automatically elide this type in the document schema, i.e. if I return a Result<Person> from an endpoint, I'd like the document to say that the endpoint returns a Person, not a Result<Person>.

I have played about with implementations of IOpenApiOperationTransformer, IOpenApiSchemaTransformer, IOpenApiDocumentTransformer, but cannot get this to work 😅 The closest I've got is correcting the endpoint return types in the document, but not removing the redundant Result<T> schema definitions.

Can anyone help me or give me some pointers 🙂

[martincostello]

The approach in #63473 (comment) (well, something based on it) might be want you want.

[slang25]

@martincostello that's exactly what I'm after, and it answers a question I had when trying to build this which is - how can I get the underlying schema from the context, and the answer is wait for aspnetcore 10 which ships context.GetOrCreateSchemaAsync(underlyingType).

Thanks!