from functools import partial
from typing import Annotated

from pydantic import AfterValidator, BaseModel


def validate_smth(value: str, context: str) -> str:
    if value == "test":
        print(f"Validated {value}")
    else:
        raise ValueError(f"Value {value} is not allowed in context {context}")
    return value


class MyModel(BaseModel):
    field: Annotated[str, AfterValidator(partial(validate_smth, context="test"))]


MyModel.model_validate({"field": "test"})