TypeError: issubclass() arg 1 must be a class for list[] config

[duytrnq]

After upgrading to version 2.5.1 I still of TypeError when init class with list[type] it will raise TypeError: issubclass() arg 1 must be a class which is supposed to be fixed
Code

from pydantic_settings import BaseSettings

class TestConfig(BaseSettings):
    cors_origins: list[str] | None = ["*"]
    cors_headers: list[str] | None = ["*"]
    cors_methods: list[str] | None = ["*"]

def main():
    config = TestConfig()
    print(config.cors_origins)

if __name__ == "__main__":
    main()

Traceback

Traceback (most recent call last):
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 538, in __call__
    field_value, field_key, value_is_complex = self.get_field_value(field, field_name)
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 714, in get_field_value
    for field_key, env_name, value_is_complex in self._extract_field_info(field, field_name):
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 443, in _extract_field_info
    elif origin_is_union(get_origin(field.annotation)) and _union_is_complex(field.annotation, field.metadata):
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 2152, in _union_is_complex
    return any(_annotation_is_complex(arg, metadata) for arg in get_args(annotation))
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 2152, in <genexpr>
    return any(_annotation_is_complex(arg, metadata) for arg in get_args(annotation))
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 2118, in _annotation_is_complex
    if annotation is not None and inspect.isclass(annotation) and issubclass(annotation, RootModel):
  File "/usr/lib/python3.10/abc.py", line 123, in __subclasscheck__
    return _abc_subclasscheck(cls, subclass)
TypeError: issubclass() arg 1 must be a class

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "test.py", line 29, in <module>
    main()
  File "test.py", line 25, in main
    config = TestConfig()
  File "venv/lib/python3.10/site-packages/pydantic_settings/main.py", line 153, in __init__
    **__pydantic_self__._settings_build_values(
  File "venv/lib/python3.10/site-packages/pydantic_settings/main.py", line 357, in _settings_build_values
    source_state = source()
  File "venv/lib/python3.10/site-packages/pydantic_settings/sources.py", line 540, in __call__
    raise SettingsError(
pydantic_settings.sources.SettingsError: error getting value for field "cors_origins" from source "EnvSettingsSource"

Here is my log from pip list

$ pip list | grep pydantic
pydantic              2.8.2
pydantic_core         2.20.1
pydantic-extra-types  2.9.0
pydantic-settings     2.5.1

[notice] A new release of pip is available: 23.2.1 -> 24.2
[notice] To update, run: pip install --upgrade pip

[pgiraud]

Probably duplicate of #390

[hramezani]

Thanks @duytrnq for reporting. I will check it and prepare a fix soon

[hramezani]

Closing this issue and we can follow on #390

[hramezani]

Here is the patch #396

[hramezani]

The second patch has been released in pydantic-settings 2.5.2