decorator_optional_pydantic.py

from pydantic import BaseModel
import inspect


def optional(*fields):
    def dec(_cls):
        for field in fields:
            _cls.__fields__[field].required = False
        return _cls

    if fields and inspect.isclass(fields[0]) and issubclass(fields[0], BaseModel):
        cls = fields[0]
        fields = cls.__fields__
        return dec(cls)
    return dec

  # src from https://github.com/samuelcolvin/pydantic/issues/1223#issuecomment-775363074

usage_decoratoror_optional.py

from pydantic import BaseModel
from decorator_optional_pydantic import optional

class Book(BaseModel):
    author: str
    available: bool
    isbn: str


@optional
class BookUpdate(Book):
    pass


@optional('val1', 'val2')
class Model(BaseModel):
    val1: str
    val2: str
    captcha: str