[Hardik K (hardikkaurani)]

Pull Request

Description

When parsing an OpenAPI 3.0 document containing a $ref to a component's subschema/property (e.g., #/components/schemas/User/properties/name), OpenApiSchemaDeserializer.LoadSchema only extracted the terminal segment (name) without preserving the full JSON pointer path. As a result, ReferenceV3 defaulted to #/components/schemas/name, discarding intermediate segments (User/properties) and causing resolution failure or binding to an incorrect component schema.

This change invokes result.Reference.SetJsonPointerPath(pointer, context.GetLocation()) in OpenAPI 3.0 OpenApiSchemaDeserializer, aligning it with OpenAPI 3.1 and 3.2 deserializers.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Related Issue(s)

Fixes #3154

Changes Made

• In src/Microsoft.OpenApi/Reader/V3/OpenApiSchemaDeserializer.cs, called SetJsonPointerPath(pointer, context.GetLocation()) on result.Reference when pointer != null.
• Added unit and regression tests in test/Microsoft.OpenApi.Readers.Tests/V3Tests/OpenApiSubschemaReferenceTests.cs verifying single-level and nested component property $ref resolution in OpenAPI 3.0.

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Local verification:

• dotnet test test/Microsoft.OpenApi.Readers.Tests/Microsoft.OpenApi.Readers.Tests.csproj --filter "FullyQualifiedName~OpenApiSubschemaReferenceTests" passed (2 succeeded, 0 failed).
• Full Microsoft.OpenApi.Readers.Tests suite passed (638 passed, 0 failed).
• Full Microsoft.OpenApi.Tests suite passed (1310 passed, 0 failed).

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Versions applicability

• My change applies to the version 1.X of the library, if so PR link:
• My change applies to the version 2.X of the library, if so PR link:
• My change applies to the version 3.X of the library, if so PR link:
• I have evaluated the applicability of my change against the other versions above.

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