How to specify correctly?

Question

Django

Hello, I have a piece of code that, after updating django to version 2, fell down when the server started. Please tell me how to fix it right.

class FilerFolderField(models.ForeignKey):
    default_form_class = AdminFolderFormField
    default_model_class = Folder

    def __init__(self, **kwargs):
        # We hard-code the `to` argument for ForeignKey.__init__
        dfl = get_model_label(self.default_model_class)
        if "to" in kwargs.keys():  # pragma: no cover
            old_to = get_model_label(kwargs.pop("to"))
            if old_to != dfl:
                msg = "%s can only be a ForeignKey to %s; %s passed" % (
                    self.__class__.__name__, dfl, old_to
                )
                warnings.warn(msg, SyntaxWarning)
        kwargs['to'] = dfl
        super(FilerFolderField, self).__init__(**kwargs)

    def formfield(self, **kwargs):
        # This is a fairly standard way to set up some defaults
        # while letting the caller override them.
        defaults = {
            'form_class': self.default_form_class,
        }
        try:
            defaults['rel'] = self.remote_field
        except AttributeError:
            defaults['rel'] = self.rel
        defaults.update(kwargs)
        return super(FilerFolderField, self).formfield(**defaults)

Command line error:

line 124, in __init__
    super(FilerFolderField, self).__init__(**kwargs)
TypeError: __init__() missing 1 required positional argument: 'on_delete'

Answer 1

super().__init__(*args, **kwargs)