find_batch_by_source

@accepts(RB.Source)
@returns(<list>)
def find_batch_by_source(source)

Finds all transfer batches where @source is the source or destination. This should be used to wait for transfers to finish (or cancel them) before ejecting a device. The transfer batches are returned in the order they're found in the queue, so waiting for the @RBTrackTransferBatch::complete signal on the last one is sufficient to wait for them all to finish.