How to remove validators from subclass V2?

[korawica]

From the discussion: How to remove validators from subclass?.

Warning

I want to know how to implement this decorator function on Pydantic V2.

I do not get or set f.validators attribute from the FieldInfo object that was generated from Model.model_fields. The error that was raised is:

...
    f.validators = _remove_validators(f.validators, names)
E   AttributeError: 'FieldInfo' object has no attribute 'validators'

I read a lot of the Pydantic documents and blogs, and I am not an expert on Python to read all of raw source code to fix this problem.

Prerequisites

• I use Pydantic version 2.7.1 and Python version 3.9.13
• I change model.__fields__.values() to model.model_fields.values()

from typing import TypeVar, Callable, Type, Container
from pydantic import BaseModel

TModel = TypeVar("TModel", bound=BaseModel)

def _remove_validators(
    validators, names: Container[str]
):
    return [v for v in validators if v.__name__ not in names]


def remove_validators(*names: str) -> Callable[[Type[TModel]], Type[TModel]]:
    def decorator(model: Type[TModel]) -> Type[TModel]:
        for f in model.model_fields.values():
            f.validators = _remove_validators(f.validators, names)
            if f.pre_validators:
                f.pre_validators = (
                    _remove_validators(f.pre_validators, names) or None
                )
            if f.post_validators:
                f.post_validators = (
                    _remove_validators(f.post_validators, names) or None
                )

        return model

    return decorator

Usecase

I want to remove some field validator function from my sub-class of some parent BaseModel. The parent that I want to inherit is one that implements many validator functions and has a lot of fields. I do not want to create a new one that removes the one validator function 😢.