Regex Field in Document like odmantic bson.Regex

[lothesven-clauger]

Hello,

In the process to migrate from odmantics to beanie, I need to process a List of Regex elements:

from odmantic import Model, Field
from odmantic.bson import Regex
class MyClass(Model):
    myField: Optional[List[Regex]] = None

I haven't figured out how to do it properly with beanie.
What I managed so far is to declare myField as List[Any] to read the Regex elements in my database and convert then to strings on the go when reading. But this solution can't store Regex, only strings.

def transform_to_str(input_data: List) -> List[Regex]:
    regex_list = []
    for element in input_data:
        if isinstance(element, str):
            regex_list.append(element)
        if isinstance(element, Regex):
            regex_list.append(element.pattern)
    return regex_list


class MyClass(Document):

    myField: Optional[List[Any]] = Field(default=None)

    @field_validator(
        'myField'
    )
    def convert_bson_regex(cls, value):
        return transform_to_str(value)

This solution seems to work but it feels a bit clunky.
Am i missing something ?