Method fdel

lib/sqlalchemy/ext/indexable.py:344–355

(self, instance: Any)

            flag_modified(instance, attr_name)

    def fdel(self, instance: Any) -> None:
        attr_name = self.attr_name
        column_value = getattr(instance, attr_name)
        if column_value is None:
            raise AttributeError(self.attr_name)
        try:
            del column_value[self.index]
        except KeyError as err:
            raise AttributeError(self.attr_name) from err
        else:
            setattr(instance, attr_name, column_value)
            flag_modified(instance, attr_name)

    def expr(
        self, model: Any