Generic detail view DetailView must be called with either an object pk or a slug.
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解决办法
url(r'^(?P<poll_id>\d+)/$',-$ url(r'^(?P<poll_id>\d+)/results/$',-$ This is the correct core:
url(r'^(?P<pk>\d+)/$',-$ url(r'^(?P<pk>\d+)/results/$',-$ 把URL捕获的组名称改为pk
参照：
http://stackoverflow.com/questions/12304050/django-tutorial-generic-views-attribute-error
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