Question

嘿伙计们，我刚刚在我的一些代码中实现了Django Cache Local Memory后端，但它似乎导致了一个问题。

尝试查看站点时出现以下错误（启用调试）：

Traceback (most recent call last):

  File "/usr/lib/python2.6/dist-packages/django/core/servers/basehttp.py", line 279, in run
    self.result = application(self.environ, self.start_response)

  File "/usr/lib/python2.6/dist-packages/django/core/servers/basehttp.py", line 651, in __call__
    return self.application(environ, start_response)

  File "/usr/lib/python2.6/dist-packages/django/core/handlers/wsgi.py", line 245, in __call__
    response = middleware_method(request, response)

  File "/usr/lib/python2.6/dist-packages/django/middleware/cache.py", line 91, in process_response
    patch_response_headers(response, timeout)

  File "/usr/lib/python2.6/dist-packages/django/utils/cache.py", line 112, in patch_response_headers
    response['Expires'] = http_date(time.time() + cache_timeout)

TypeError: unsupported operand type(s) for +: 'float' and 'str'

我检查了我的代码，因为缓存一切似乎都没问题。例如，我的中间件中有以下内容。

MIDDLEWARE_CLASSES = (
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.cache.FetchFromCacheMiddleware',
    'django.contrib.flatpages.middleware.FlatpageFallbackMiddleware',
)

我的缓存设置：

CACHE_BACKEND = 'locmem://'
CACHE_MIDDLEWARE_SECONDS = '3600'
CACHE_MIDDLEWARE_KEY_PREFIX = 'za'
CACHE_MIDDLEWARE_ANONYMOUS_ONLY = True

我的一些代码（模板标签）：

def get_featured_images():
    """
    provides featured images
    """

    cache_key = 'featured_images'
    images = cache.get(cache_key)
    if images is None:        
        images = FeaturedImage.objects.all().filter(enabled=True)[:5]
        cache.set(cache_key, images)


    return {'images': images}

任何想法可能是什么问题，从下面的错误信息看起来django的cache.py中存在问题？

更新!!!将时间缓存设置为字符串！

Answer 1

您将缓存的秒数定义为字符串而不是int。应该是：

CACHE_MIDDLEWARE_SECONDS = 3600

Answer 2

CACHE_MIDDLEWARE_SECONDS应该是int / float，而不是string：

CACHE_MIDDLEWARE_SECONDS = 3600

Django缓存似乎导致了问题

2 个答案: