2.6.0 broke model_validate_json on str | os.PathLike fields

[jamesbraza]

This code with Python 3.12.7 and pydantic==2.9.2:

• Works with pydantic-settings==2.5.2
• Crashes with pydantic-settings==2.6.0

import os
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings


class SomeSettings(BaseSettings):
    path: str | os.PathLike = Field(default=Path("."))


SomeSettings.model_validate_json("{}")

The error:

Traceback (most recent call last):
  File "/path/to/a.py", line 12, in <module>
    SomeSettings.model_validate_json("{}")
  File "/path/to/.venv/lib/python3.12/site-packages/pydantic/main.py", line 625, in model_validate_json
    return cls.__pydantic_validator__.validate_json(json_data, strict=strict, context=context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pydantic_core._pydantic_core.ValidationError: 2 validation errors for SomeSettings
path.str
  Input should be a valid string [type=string_type, input_value=PosixPath('.'), input_type=PosixPath]
    For further information visit https://errors.pydantic.dev/2.9/v/string_type
path.lax-or-strict[lax=union[json-or-python[json=function-after[path_validator(), str],python=is-instance[PathLike]],function-after[path_validator(), str]],strict=json-or-python[json=function-after[path_validator(), str],python=is-instance[PathLike]]]
  Input is not a valid path for <class 'os.PathLike'> [type=path_type, input_value=PosixPath('.'), input_type=PosixPath]

Process finished with exit code 1

[hramezani]

Thanks @jamesbraza for reporting this issue.

This is a duplicate of #445 and caused by 76ba2c6.

please follow the original issue

[jamesbraza]

Okay sure sorry didn't realize. I will close this out in favor of #445 then

[hramezani]

No worries, please follow the issue. I will update the issue after we made the final decision
#445 (comment)