Как я могу получить 'pk' или 'id' в get_context_data из CVB DetailView?
class MyDetail(DetailView):
    model = Book
    template_name = 'book.html'
    def get_context_data(self, **kwargs):
            context = super(MyDetail, self).get_context_data(**kwargs)
            context['something'] = Book.objects.filter(pk=pk)
            return context
URL:
url(r'^book/(?P<pk>\d+)/$', MyDetail.as_view(), name='book'),
