invalidation.py 文件源码

def invalidate_new_back_revs(event):
    ''' Invalidate objects that rev_link to us

    Catch those objects which newly rev_link us
    '''
    context = event.object
    updated = event.request._updated_uuid_paths
    initial = event.request._initial_back_rev_links.get(context.uuid, {})
    properties = context.upgrade_properties()
    current = {
        path: set(simple_path_ids(properties, path))
        for path in context.type_info.merged_back_rev
    }
    for rel, uuids in current.items():
        for uuid in uuids.difference(initial.get(rel, ())):
            updated[uuid]