def delete(self):
        """Delete the enum value.
        """
        assert self.exists, "Cannot delete non-existent %s" % self.type

        with self.env.db_transaction as db:
            self.env.log.info("Deleting %s %s", self.type, self.name)
            db("DELETE FROM enum WHERE type=%s AND value=%s",
               (self.type, self._old_value))
            # Re-order any enums that have higher value than deleted
            # (close gap)
            for enum in self.select(self.env):
                try:
                    if int(enum.value) > int(self._old_value):
                        enum.value = unicode(int(enum.value) - 1)
                        enum.update()
                except __HOLE__:
                    pass  # Ignore cast error for this non-essential operation
            TicketSystem(self.env).reset_ticket_fields()
        self.value = self._old_value = None
        self.name = self._old_name = None
dataset/ETHPy150Open edgewall/trac/trac/ticket/model.py/AbstractEnum.delete