Catch pydantic validation errors with one validation type

[ketozhang]

I wonder if it is possible to modify the AsdfPydanticModel to raise the same ValidationError as ASDF does? That way libraries reading asdf files will on need to worry about catching one error type.
@WilliamJamieson

[ketozhang]

ASDF's error is a direct use of jsonschema's which is not a subclass of a standard type

from jsonschema import ValidationError

Pydantic's error is a subclass of TypeError

from pydantic.error_wrappers import ValidationError

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I really would love to use ExceptionGroup (new in Python 3.11) for this because there are situations where I want to catch only pydantic validation error.

[WilliamJamieson]

Maybe asdf should define a AsdfValidationError which inherits from both TypeError and jsonschema.ValidationError? I think that would be a reasonable improvement on asdf's part.

Conversely, since this is such a new library you could just require Python 3.11 to use it.

[ketozhang]

Desired result:

from asdf import ValidationError

try:
    af.open(...)
except ValidationError:
    ...

After Python 3.11,

from asdf import ValidationError
# Very verbose, could forward this asdf_pydantic
from pydantic.error_wrappers import ValidationError as PydanticValidationError  

try:
    af.open(...)
except* ValidationError:
    ...
except* PydanticValidationError:
   ...

[ketozhang]

Good idea on inheriting TypeError. I'd keep the same name ValidationError for compatibilty.

Conversely, since this is such a new library you could just require Python 3.11 to use it.

I will consider it; I have things in Roman that are 3.10.