python - objects.get(id) 中的 Django 错误 'too many values to unpack'

Question

我有这样的网址 http://gagandeepdesk/2690/我正在使用 urls.py 文件进行过滤，并将 2690 作为参数之一发送给该函数。

我的 urls.py 过滤器看起来像这样，

url(r'^(\d+)/', 'scango.scanner.views.download'),

那个函数看起来像这样，

def download(request, MediaId):
    media = Media.objects.get(id=int(MediaId))
    #print media
    return HttpResponse(FileIterWrapper(open(media.path)))

我在线上收到错误“太多的值无法解包”

media = Media.objects.get(id=int(MediaId))

我也试过在没有请求对象的情况下独立运行这个函数，它运行得非常好。所以，我很困惑我在这里做错了什么。

环境:

Request Method: GET
Request URL: http://gagandeepdesk/2690/

Django Version: 1.3
Python Version: 2.7.1
Installed Applications:
['haystack',
 'scanner',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')

回溯:

File "C:\Python27\lib\site-packages\django\core\handlers\base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "C:\Users\gagasing\Desktop\ideas\scango\..\scango\scanner\views.py" in download
  21.   media = Media.objects.get(id=int(MediaId))
File "C:\Python27\lib\site-packages\django\db\models\manager.py" in get
  132.         return self.get_query_set().get(*args, **kwargs)
File "C:\Python27\lib\site-packages\django\db\models\query.py" in get
  343.         clone = self.filter(*args, **kwargs)
File "C:\Python27\lib\site-packages\django\db\models\query.py" in filter
  552.         return self._filter_or_exclude(False, *args, **kwargs)
File "C:\Python27\lib\site-packages\django\db\models\query.py" in _filter_or_exclude
  570.             clone.query.add_q(Q(*args, **kwargs))
File "C:\Python27\lib\site-packages\django\db\models\sql\query.py" in add_q
  1170.                             can_reuse=used_aliases, force_having=force_having)
File "C:\Python27\lib\site-packages\django\db\models\sql\query.py" in add_filter
  1013.         arg, value = filter_expr

Exception Type: ValueError at /2690/
Exception Value: too many values to unpack

Answer 1

 (r'^(?P<MediaId>\d+)/$', 'scango.scanner.views.download')

也许试试这个？

这是命名组的示例。

In Python regular expressions, the syntax for named regular expression groups is (?Ppattern), where name is the name of the group and pattern is some pattern to match.