[BUG] Decimal type on save about beanie HOT 8 CLOSED

from typing import Any, Callable, TypeVar, cast

import bson
from pydantic import BaseModel, create_model, model_validator

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


def beanie_decimal(*fields: str) -> Callable[[type[T]], type[T]]:
    def validator(cls: type[T], v: Any) -> Any:
        for f in (f.split(".") for f in fields):
            current = v

            while (field := f.pop(0)) and current:
                if not len(f):
                    if value := current.get(field, None):
                        current[field] = (
                            value.to_decimal()
                            if isinstance(value, bson.Decimal128)
                            else value
                        )
                    break

                current = current.get(field, None)

        return v

    def decorator(model: type[T]) -> type[T]:
        return create_model(
            model.__name__,
            __base__=model,
            __module__=model.__module__,
            __validators__={
                "beanie_decimal": cast(
                    classmethod, model_validator(mode="before")(validator)
                )
            },
        )

    return decorator


@beanie_decimal("price")
class Product(Document):
  name: str
  price: Decimal = Field(decimal_places=3)

product = Product(name="Apple", price=Decimal('1.99'))
await product.save()