chore: add support for non-discriminator, oneOf query parameters

[mcnulty-fp]

This PR updates the handling for oneOf constructs that do not use a discriminator to allow query parameters to use a union type to expand the accepted types for a parameter without breaking backward compatibility. This functionality will be used for the pending changes to expand start and end to accept a date-time string.

These template updates do not add JSON serialization and deserialization support for the generated type alias for a union type because that functionality is not yet needed.

Itemized changes:

• Update model_oneof.mustache to generate a type alias rather than a container class when a oneOf construct does not use a discriminator. This allows additional types to be used for query parameters without breaking backward compatibility.
• Update partial_api_args.mustache to generate type annotations for parameters that use oneOf construct without a discriminator.
• Update api.mustache to handle query parameters that use a union type when their schema is a oneOf construct without a discriminator.
• Update model_doc.mustache to document that a oneOf construct without a discriminator is a type alias.

See #191 for the code generated after these template updates and the schema is updated to use a oneOf for start and end.

[github-actions]

☂️ Python Coverage

current status: ✅

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Lines	Covered	Coverage	Threshold	Status
2925	2108	72%	0%	🟢

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updated for commit: cf5c361 by action🐍

[Copilot]

Pull request overview

This PR updates the OpenAPI generator templates to support oneOf query parameters that don't use a discriminator, generating a Python type alias (Union[...]) instead of a container class. This enables expanding accepted parameter types (e.g. allowing both date and date-time for start/end) without breaking backward compatibility.

Changes:

• model_oneof.mustache now emits a Union type alias for non-discriminator oneOf schemas.
• api.mustache and partial_api_args.mustache generate proper imports, type annotations, and runtime serialization branches (datetime/date/other) for union-typed query parameters.
• model_doc.mustache documents the generated type alias.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
template/model_oneof.mustache	Generate Union type alias instead of model class for non-discriminator oneOf.
template/partial_api_args.mustache	Emit Annotated[Optional[...]] type hints for oneOf composed-schema params.
template/api.mustache	Add union-imports workaround and runtime serialization branch for oneOf query params.
template/model_doc.mustache	Document non-discriminator oneOf as a type alias.

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[erayaydin]

LGTM. Just added a couple of notes. Looks like the Server API can parse it with or without the colon in the current usage

[erayaydin]

I think assuming the timezone info could lead to issues, so I submitted a request change. Happy to discuss it further 😇

[github-actions]

⚠️ This PR doesn't contain any changesets. If there are user-facing changes, don't forget to run:

pnpm exec changeset

to create a changeset.

[erayaydin]

LGTM