Description
Is there an existing issue for this?
- I have searched the existing issues
Describe the bug
Using polymorphic types and returning both the base class and derived class in separate controller actions causes OpenApi document generation to fail.
Document generation succeeds if you disable/remove public ComponentDto GetComponent() action in the provided example repository.
Also it seems like something is wrong with the generated document (when the exception causing controller action is removed). At most I would expect two model schemas to be generated
ComponentDtoComponentDtoSectionDto- does Microsoft.AspNetCore.OpenApi support custom names? I don't like the auto-generated one.
but it also generates a weird looking SectionDto schema which seems like a weird mix of ComponentDto & SectionDto
Expected Behavior
OpenApi document generation should not fail and should generate correct schemas when using polymorphic types.
Steps To Reproduce
https://github.com/keenjus/OpenApiStuff/tree/7d736b83d4ddf5b4208580b9d265d690f082d7b4
Launch the project and navigate to http://localhost:5052/openapi/v1.json. Should fail with "ArgumentException: An item with the same key has already been added. Key: ComponentDtoSectionDto "
Exceptions (if any)
ArgumentException: An item with the same key has already been added. Key: ComponentDtoSectionDto
System.Collections.Generic.Dictionary<TKey, TValue>.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
System.Collections.Generic.Dictionary<TKey, TValue>.Add(TKey key, TValue value)
Microsoft.AspNetCore.OpenApi.OpenApiSchemaReferenceTransformer.TransformAsync(OpenApiDocument document, OpenApiDocumentTransformerContext context, CancellationToken cancellationToken)
Microsoft.AspNetCore.OpenApi.OpenApiDocumentService.ApplyTransformersAsync(OpenApiDocument document, IServiceProvider scopedServiceProvider, CancellationToken cancellationToken)
Microsoft.AspNetCore.OpenApi.OpenApiDocumentService.GetOpenApiDocumentAsync(IServiceProvider scopedServiceProvider, CancellationToken cancellationToken)
Microsoft.AspNetCore.OpenApi.OpenApiDocumentService.GetOpenApiDocumentAsync(IServiceProvider scopedServiceProvider, CancellationToken cancellationToken)
Microsoft.AspNetCore.Builder.OpenApiEndpointRouteBuilderExtensions+<>c__DisplayClass0_0+<<MapOpenApi>b__0>d.MoveNext()
Microsoft.AspNetCore.Http.Generated.<GeneratedRouteBuilderExtensions_g>F56B68D2B55B5B7B373BA2E4796D897848BC0F04A969B1AF6260183E8B9E0BAF2__GeneratedRouteBuilderExtensionsCore+<>c__DisplayClass2_0+<<MapGet0>g__RequestHandler|5>d.MoveNext()
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)
.NET Version
9.0.100-rc.1.24452.12
Anything else?
Microsoft.AspNetCore.OpenApi 9.0.0-rtm.24501.7