How can I make the sqladmin panel use the init method of the model?

[ddosmukhambetov]

I have a specific model with an init method that generates a slug:

Class SomeModel:
    title: Mapped[str] = mapped_column(String(255), unique=True)
    slug: Mapped[str] = mapped_column(String, unique=True, index=True)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        if not self.slug or self.slug == '':
            self.slug = slugify(self.title)

And i have AdminView:

class SomeAdmin(ModelView, model=SomeModel):
    name = 'Example'
    name_plural = 'Exmaples'
    icon = 'fa-solid fa-layer-group'

But when creating an object from the admin panel, I get the following error: decoding to str: need a bytes-like object, NoneType found
And if I remove the init method from the model, then everything works, how can I make the initialization of the model take place first?

[aminalaee]

And you are seeing this issue when you create a new SomeModel?