Deskriptor zur trägen Deserialisierung von Modellfeldern in Django

import json
from typing import Any, Type
 
class LazyJSONDescriptor:
    def __init__(self, field_name: str):
        self.field_name = field_name
 
    def __get__(self, instance: Any, owner: Type[Any]) -> Any:
        if instance is None:
            return self
        raw_val = instance.__dict__.get(self.field_name)
        if isinstance(raw_val, str):
            parsed = json.loads(raw_val)
            instance.__dict__[self.field_name] = parsed
            return parsed
        return raw_val
 
    def __set__(self, instance: Any, value: Any) -> None:
        instance.__dict__[self.field_name] = value