python - Django - 在 get_context_data 内部过滤

Question

在 Django 中使用基于类的 View ，我在 DetailView 中遇到问题。

我想要得到的是特定类型的所有电影的列表，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

我收到这个错误:

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

当我尝试将 Movie.objects.all().filter(genre=pk) 替换为 Movie.objects.all().filter(genre=kwargs['pk'] ) 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'

我似乎无法弄清楚出了什么问题，我们将不胜感激!

Answer 1

传递给 get_context_data 的 kwargs 参数不包含对象的主键值。不过，您可以从 self.kwargs 获取它:

Movie.objects.all().filter(genre=self.kwargs['pk'])

此外，当您在 get_context_data，因此您也可以使用它来执行以下操作:

Movie.objects.all().filter(genre=self.object)