Question

在Django中使用基于类的视图，我在DetailView内部出现问题。

我想获得的是特定类型的所有电影列表，即：Movie.objects.all().filter(genre=genre_id)。

class GenreView(generic.DetailView):
    model = Genre
    template_name = 'movies/genre.html'
    context_object_name = 'this_genre'
def get_context_data(self, **kwargs):
    context = super(GenreView, self).get_context_data(**kwargs)
    context.update({
        'all_movies': Movie.objects.all().filter(genre=pk),
        'all_genres': Genre.objects.all()
    })
    return context

我收到此错误：

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\handler
s\base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\handler
s\base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\views\generi
c\base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\views\generi
c\base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\views\generi
c\detail.py", line 118, in get
    context = self.get_context_data(object=self.object)
  File "C:\Users\admin\trailers\movies\views.py", line 43, in get_context_data
    'all_movies': Movie.objects.all().filter(genre=pk),
NameError: name 'pk' is not defined

当我尝试用Movie.objects.all().filter(genre=pk)替换Movie.objects.all().filter(genre=kwargs['pk'])时，我得到了：

Traceback (most recent call last):
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\handler
s\base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\core\handler
s\base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\views\generi
c\base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\views\generi
c\base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "C:\Program Files (x86)\Python35-32\lib\site-packages\django\views\generi
c\detail.py", line 118, in get
    context = self.get_context_data(object=self.object)
  File "C:\Users\admin\trailers\movies\views.py", line 43, in get_context_data
    'all_movies': Movie.objects.all().filter(genre=kwargs['pk']),
KeyError: 'pk'

我似乎无法弄清楚什么是错的，任何帮助都会受到赞赏！

Answer 1

传递给kwargs的{{1}}参数不包含对象的主键值。你可以从get_context_data得到它：

self.kwargs

此外，当您在Movie.objects.all().filter(genre=self.kwargs['pk'])内时，您会看到self.object （这是Genre已获取的实例）存在且可以访问，因此您可以使用它来执行以下操作：

get_context_data

Answer 2

  'all_movies': Movie.objects.all().filter(genre=pk)

你确实没有定义pk。您需要先将pk分配给pk变量。

此外，您不需要包含所有内容：

Movie.objects.filter(genre=pk)

Django - 在get_context_data中过滤

2 个答案: