[Python] Support patching polymorphic models

[annatisch]

If a polymorphic model is patched - it wont be deserialized unless it has explicitly been declared with the same discriminator as its parent. This patch intends to automatically infer that discriminator, so that the patched model will replace the original in polymorphic deserialization.

Before:

from ._models import PolyMorphicModel as GeneratedModel

# Unless the original discriminator was specified, this patched model would not be
# used for deserialization.
class ModifiedModel(GeneratedModel, discriminator="fooModel"):
    extra_property: str = "Foo"

After:

from ._models import PolyMorphicModel as GeneratedModel

# The discriminator is now automatically inferred from the inherited model.
class ModifiedModel(GeneratedModel):
    extra_property: str = "Foo"

[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-python@9923

commit: 71df4db

[github-actions]

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• ❌@typespec/http-client-python

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[azure-sdk]

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