Question

我在django项目中遇到了这个问题，我认为这与缓存有关。它每6个月左右出现一次，并通过重新启动应用程序来“修复”，但几个月后才会回来。突然间，所有视图都会因此异常而失败。

TypeError: weak object has gone away

并且它并不总是相同的对象，每个视图都会因尝试访问其他对象而失败。在这种情况下，它访问用户（使用request.user.is_authenticated()），但其他页面与其他对象一起访问。

我认为缓存一定有问题。也许这是django中的一个问题。我不知道。它只是工作正常，直到它没有，似乎没有人在互联网上谈论这个例外。

以下是一个示例追溯：

Traceback (most recent call last):

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/core/handlers/base.py", line 88, in get_response
    response = middleware_method(request)

  File "/home/rsaenz/webapps/club/club/cms/socios/views.py", line 143, in process_request
    if not request.user.is_authenticated():

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/utils/functional.py", line 213, in inner
    self._setup()

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/utils/functional.py", line 298, in _setup
    self._wrapped = self._setupfunc()

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/contrib/auth/middleware.py", line 18, in <lambda>
    request.user = SimpleLazyObject(lambda: get_user(request))

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/contrib/auth/middleware.py", line 10, in get_user
    request._cached_user = auth.get_user(request)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/contrib/auth/__init__.py", line 140, in get_user
    user_id = request.session[SESSION_KEY]

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py", line 47, in __getitem__
    return self._session[key]

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/contrib/sessions/backends/base.py", line 173, in _get_session
    self._session_cache = self.load()

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/contrib/sessions/backends/db.py", line 20, in load
    expire_date__gt=timezone.now()

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/manager.py", line 151, in get
    return self.get_queryset().get(*args, **kwargs)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/query.py", line 301, in get
    clone = self.filter(*args, **kwargs)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/query.py", line 593, in filter
    return self._filter_or_exclude(False, *args, **kwargs)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/query.py", line 611, in _filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1204, in add_q
    clause = self._add_q(where_part, used_aliases)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1240, in _add_q
    current_negated=current_negated)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1131, in build_filter
    clause.add(constraint, AND)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/utils/tree.py", line 104, in add
    data = self._prepare_data(data)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/db/models/sql/where.py", line 61, in _prepare_data
    if is_iterator(value):

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/site-packages/django/utils/itercompat.py", line 30, in is_iterator
    return isinstance(x, collections.Iterator)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/abc.py", line 144, in __instancecheck__
    return cls.__subclasscheck__(subtype)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/abc.py", line 184, in __subclasscheck__
    cls._abc_negative_cache.add(subclass)

  File "/home/rsaenz/virtualenvs/club/lib/python2.7/_weakrefset.py", line 86, in add
    self.data.add(ref(item, self._remove))

TypeError: weak object has gone away

谢谢！

Answer 1

基于回溯，这看起来更像是一个Python weakrefset问题，collections.Iterator依赖于abc（抽象基类）模块。

弱物已经消失了？ - python / django

1 个答案: