ValidationError when combining dotenv file, env_prefix and fields with alias about pydantic-settings HOT 5 CLOSED

Thanks @gsakkis for reporting this.

dotenv setting source consider extra config. So

Pydantic settings consider extra config in case of dotenv file. It means if you set the extra=forbid (default) on model_config and your dotenv file contains an entry for a field that is not defined in settings model, it will raise ValidationError in settings construction.

This is not the case in env source because it will ignore the extra input.

You can ignore this behavior by adding extra='ignore' to your config

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Thanks @hramezani for the quick reply! I'm not sure how the quoted docs are relevant here; xxx__bar does refer to a field defined in the model, it's not an extra I want to ignore.

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Sorry @gsakkis for misunderstanding. Now, I got your point.

I will prepare a patch to fix this bug

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I've created #221 to fix it. it would be great to take a look or test it if you want

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@gsakkis any chance you could review @hramezani's PR.

Ignore me, I see you already reviewed.

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