如何在Django命名空间可重用应用程序中进行反向URL搜索

urlpatterns = patterns('',
    # ella urls
    url('^ella/', include('ella.core.urls', namespace="ella")),
)

现在,Ella应用程序有这样的URL:

urlpatterns = patterns( '',
    url( r'^(?P<category>[a-z0-9-/]+)/$', category_detail, name="category_detail" ),
    # object detail
    url( r'^(?P<category>[a-z0-9-/]+)/(?P<year>\d{4})/(?P<month>\d{1,2})/(?P<day>\d{1,2})/(?P<content_type>[a-z0-9-]+)/(?P<slug>[a-z0-9-]+)/$',
        object_detail, name="object_detail" )
)

现在,打电话来 {% url ella:category_detail category="cat" %}

from django.core.urlresolvers import reverse
url = reverse('object_detail', kwargs={'required' : 'params'})

除非重写为

from django.core.urlresolvers import reverse
url = reverse('ella:object_detail', kwargs={'required' : 'params'})

.

是真的吗?我错过了什么?有什么办法吗?