Django会话存储所有会话

Question

我将django会话存储在磁盘上。我有一个特殊的情况，我需要遍历每个会话并删除某些键，然后保留其余的键。因此，清除整个缓存不是一种选择。当会话在db中时，我能够迭代各个会话。但是有了会话存储，我就卡住了。我需要做的类似于：

    sessions=sessionstore.all()
    for session in sessions:
      session.pop('key1')
      session.pop('key2')
      if session lastmodified before some time:
        del session

Answer 1

看看django.contrib.sessions.backends.file中的clear_expired方法是如何完成迭代的：

@classmethod
def clear_expired(cls):
    storage_path = cls._get_storage_path()
    file_prefix = settings.SESSION_COOKIE_NAME

    for session_file in os.listdir(storage_path):
        if not session_file.startswith(file_prefix):
            continue
        session_key = session_file[len(file_prefix):]
        session = cls(session_key)
        # When an expired session is loaded, its file is removed, and a
        # new file is immediately created. Prevent this by disabling
        # the create() method.
        session.create = lambda: None
        session.load()