def foo(hero_in:HeroCreate, related_id:int, owner_id:int):
    hero.sqlmodel_update(
            hero_in,
            update={
                "related_id": related_id,
                "owner_id": owner_id,
            },
        )

#####
def sqlmodel_update(
        self: _TSQLModel,
        obj: Union[Dict[str, Any], BaseModel],
        *,
        update: Union[Dict[str, Any], None] = None,
    ) -> _TSQLModel:
        use_update = (update or {}).copy()
        if isinstance(obj, dict):
            for key, value in {**obj, **use_update}.items():
                if key in get_model_fields(self):
                    setattr(self, key, value)
        elif isinstance(obj, BaseModel):
            for key in get_model_fields(obj):
                if key in use_update:
                    value = use_update.pop(key)
                else:
                    value = getattr(obj, key)
                setattr(self, key, value)
            for remaining_key in use_update:
                if remaining_key in get_model_fields(self):
                    value = use_update.pop(remaining_key) # NOTE the problem is here.
                    setattr(self, remaining_key, value)
        else:
            raise ValueError(
                "Can't use sqlmodel_update() with something that "
                f"is not a dict or SQLModel or Pydantic model: {obj}"
            )
        return self

for remaining_key in use_update:
                if remaining_key in get_model_fields(self):
                    value = use_update.pop(remaining_key) # NOTE the problem is here.
                    setattr(self, remaining_key, value)