Nested field names containing underscore can no longer be parsed from env

[WieslerAA]

Example settings that worked before 2.6.0:

from pydantic_settings import BaseSettings, SettingsConfigDict

os.setenv("INNER_TEST_STR", "abc")

class Inner(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="INNER_")
    test_str: str

class Settings(BaseSettings):
    inner: Inner

This can't be done any more. The env_prefix of Inner is completely ignored, since there is no env variable for inner.

Note that I also can't use the env separator _ since then the env variable is parsed as inner.test.str which is wrong.

[hramezani]

Thanks for reporting this.

It is a duplicate of #447

[hramezani]

I reverted the fix that caused the problem and released pydantic-settings 2.6.1.