How to use root_validator in Pydantic v2? API docs miss a link

[icfly2]

Discussed in #7060

^{Originally posted by deivydaslipskis August 9, 2023}
We are migrating from Pydantic v1 to Pydantic v2 and there are issues with mypy and root validator.

Here is the error received:

Mypy:
my_proj/settings.py:191: error: No overload variant of "root_validator" matches argument type "Callable[[Settings, Any], Any]"  [call-overload]
my_proj/settings.py:191: note: Possible overload variants:
my_proj/settings.py:191: note:     def root_validator(*, skip_on_failure: Literal[True], allow_reuse: bool = ...) -> Callable[[_V1RootValidatorFunctionType], _V1RootValidatorFunctionType]
my_proj/settings.py:191: note:     def root_validator(*, pre: Literal[True], allow_reuse: bool = ...) -> Callable[[_V1RootValidatorFunctionType], _V1RootValidatorFunctionType]
my_proj/settings.py:191: note:     def root_validator(*, pre: Literal[False], skip_on_failure: Literal[True], allow_reuse: bool = ...) -> Callable[[_V1RootValidatorFunctionType], _V1RootValidatorFunctionType]

Here is an example of how we used root_validator in Pydantic v1:

from pydantic import root_validator

    @root_validator
    def validate_input(cls, values: Any) -> Any:
        if values.get("file_input_path") and values.get("redis_key"):
            raise ValueError("Either file_input or redis_input should be used!")
        return values

I also could not find any documentation on root_validator in Pydantic v2 version, is it deprecated and should I use something else? If so, what should I use?

[mateoradman]

root_validator is deprecated and it is replaced by model_validator. Please look at the documentation here https://docs.pydantic.dev/latest/concepts/validators/#model-validators

[icfly2]

Please look at the related PR, it adds a link to the documentation in the relevant API documentation.