The nested BaseSettings raise a validation error when its attribute is uppercase. about pydantic-settings HOT 4 CLOSED

any specific reason why your Nested class also inherits from BaseSettings?

from pydantic-settings.

I think this is because all env vars are converted to lower case unless you have case_sensitive = True.

You can fix this with either:

• class Nested(BaseModel) instead of class Nested(BaseSettings)
• or, you can set case_sensitive = True in config on MyConfig.Config

I agree in V2 that in "case insensitive" should mean case insensitive.

from pydantic-settings.

any specific reason why your Nested class also inherits from BaseSettings?

Hi, @dsal3389 , @samuelcolvin Thanks for your replies.

I didn't know that the nested setting should inherit from BaseModel instead of BaseSettings.
Thanks for letting me know about the more standard implementation.

And the following code still does not work

import os
from pydantic import BaseSettings, BaseModel

class Nested(BaseModel):
    GOOD_BOY: str = "james"

class MyConfig(BaseSettings):
    nested: Nested = Nested()


    class Config:
        # env_prefix = "MY_"  # the prefix can't be mixed with the `env_nested_delimiter`
        env_nested_delimiter = '__'

os.environ["NESTED__GOOD_BOY"] = "env_boy_v03"
config = MyConfig()
print(config)

The case_sensitive = True works!

from pydantic-settings.

It got fixed in pydantic-settings

FYI, pydantic-settings now is a separate package and is in alpha state. you can install it by pip install pydantic-settings --pre and test it.

Here is your example in pydantic-settings:

import os

from pydantic import BaseModel, ConfigDict
from pydantic_settings import BaseSettings


class Nested(BaseModel):
    GOOD_BOY: str = "james"


class MyConfig(BaseSettings):
    nested: Nested = Nested()

    model_config = ConfigDict(env_nested_delimiter='__')

os.environ["NESTED__GOOD_BOY"] = "env_boy_v03"
config = MyConfig()
print(config)

from pydantic-settings.