def delete(self, force=False):
        """
        Volumes cannot be deleted if either a) they are attached to a device, or
        b) they have any snapshots. This method overrides the base delete()
        method to both better handle these failures, and also to offer a 'force'
        option. When 'force' is True, the volume is detached, and any dependent
        snapshots are deleted before calling the volume's delete.
        """
        if force:
            self.detach()
            self.delete_all_snapshots()
        try:
            super(CloudBlockStorageVolume, self).delete()
        except exc.VolumeNotAvailable:
            # Notify the user? Record it somewhere?
            # For now, just re-raise
            raise