def field_from_django_field(cls, field_name, django_field, readonly):
        """
        Returns a Resource Field instance for the given Django model field.
        """

        FieldWidget = cls.widget_from_django_field(django_field)
        widget_kwargs = cls.widget_kwargs_for_field(field_name)
        field = cls.DEFAULT_RESOURCE_FIELD(
            attribute=field_name,
            column_name=field_name,
            widget=FieldWidget(**widget_kwargs),
            readonly=readonly,
            default=django_field.default,
        )
        return field
Returns a Resource Field instance for the given Django model field.