def enable_sortable(self):
        self.list_per_page = 500
        self.ordering = (self.sortable,)
        if self.list_display and self.sortable not in self.list_display:
            self.list_display = list(self.list_display) + [self.sortable]

        self.list_editable = self.list_editable or []
        if self.sortable not in self.list_editable:
            self.list_editable = list(self.list_editable) + [self.sortable]

        self.exclude = self.exclude or []
        if self.sortable not in self.exclude:
            self.exclude = list(self.exclude) + [self.sortable]