IOpenApiDocumentTransformer cannot modify components.Schemas since it's null

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

When running `IOpenApiDocumentTransformer`, it would be logical to have the ability to modify the `OpenApiDocument.Components.Schemas` to make any adjustments. The `OpenApiDocument.Components` is null.

https://github.com/dotnet/aspnetcore/blob/049814ca468cad1ea1e29412e0aa3eea182a63c1/src/OpenApi/src/Services/OpenApiDocumentService.cs#L100-L106

The `await _schemaReferenceTransformer.TransformAsync(document, documentTransformerContext, cancellationToken)` populates the `Components.Schemas`, but that happens after the document transformers are run.


### Expected Behavior

It should be possible to modify Components.Schemas in the `IOpenApiDocumentTransformer`

### Steps To Reproduce

_No response_

### Exceptions (if any)

_No response_

### .NET Version

.NET 9 RC2

### Anything else?

_No response_

	for (var i = 0; i < _options.DocumentTransformers.Count; i++)
	{
	var transformer = _options.DocumentTransformers[i];
	await transformer.TransformAsync(document, documentTransformerContext, cancellationToken);
	}
	// Move duplicated JSON schemas to the global components.schemas object and map references after all transformers have run.
	await _schemaReferenceTransformer.TransformAsync(document, documentTransformerContext, cancellationToken);

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IOpenApiDocumentTransformer cannot modify components.Schemas since it's null #58406

dnv-kimbell
openedon Oct 14, 2024

Is there an existing issue for this?

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