update.py 文件源码

def save(self, **kwargs):
        new = self.pk is None
        if not new and (self.was_processed or not self.processed):
            raise TypeError

        super().save(**kwargs)

        with suppress(FileExistsError):
            os.mkdir(os.path.dirname(self._changed_geometries_filename()))

        from c3nav.mapdata.utils.cache.changes import changed_geometries
        pickle.dump(changed_geometries, open(self._changed_geometries_filename(), 'wb'))

        if new:
            transaction.on_commit(
                lambda: cache.set('mapdata:last_update', self.to_tuple, 300)
            )
            if settings.HAS_CELERY:
                transaction.on_commit(
                    lambda: process_map_updates.delay()
                )