KeyError at /x/x/ ‘pk’ django

huangapple
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英文:

KeyError at /x/x/ 'pk' django

问题

views.py

  1. class MangaView(DetailView):
  2.     model = Manga
  3.     template_name = 'mangas/manga.html'
  4.     context_object_name = 'manga'
  5.     slug_field = 'manga_slug'
  6.     slug_url_kwarg = 'manga_slug'
  8.     def get_context_data(self, **kwargs):
  9.         data = super().get_context_data(**kwargs)
  11.         manga = get_object_or_404(Manga, id=self.kwargs['pk'])  # error line
  12.         favorited = False
  13.         latered = False
  14.         ...
  15.         return data

urls.py

  1. urlpatterns = [
  2.     path('mangas/', MangasHomeView.as_view(), name='mangas-home'),
  3.     path('manga/<slug:manga_slug>/', MangaView.as_view(), name='manga'),
  4.     ...
  5. ]

请注意，代码部分没有进行翻译。

英文:

I'm trying to get a DetailView's model's pk in a variable in the get_context_data but I keep getting the error KeyError at /x/x/ 'pk'.

views.py

  1. class MangaView(DetailView):
  2.     model = Manga
  3.     template_name = &#39;mangas/manga.html&#39;
  4.     context_object_name = &#39;manga&#39;
  5.     slug_field = &#39;manga_slug&#39;
  6.     slug_url_kwarg = &#39;manga_slug&#39;
  8.     def get_context_data(self, **kwargs):
  9.         data = super().get_context_data(**kwargs)
  11.         manga = get_object_or_404(Manga, id=self.kwargs[&#39;pk&#39;])  # error line
  12.         favorited = False
  13.         latered = False
  14.         ...
  15.         return data

urls.py

  1. urlpatterns = [
  2.     path(&#39;mangas/&#39;, MangasHomeView.as_view(), name=&#39;mangas-home&#39;),
  3.     path(&#39;manga/&lt;slug:manga_slug&gt;/&#39;, MangaView.as_view(), name=&#39;manga&#39;),
  4.     ...
  5. ]

答案1

得分: 2

你看到的错误是因为尝试通过self.kwargs访问pk值，而实际上你的视图正在使用slug字段和slug URL参数。

尝试使用self.get_object()，因为它会在DetailView中为你提供当前实例，无论是pk还是slug，如下所示：

  1. class MangaView(DetailView):
  2.     model = Manga
  3.     template_name = 'mangas/manga.html'
  4.     context_object_name = 'manga'
  5.     slug_field = 'manga_slug'
  6.     slug_url_kwarg = 'manga_slug'
  8.     def get_context_data(self, **kwargs):
  9.         data = super().get_context_data(**kwargs)
  11.         manga = self.get_object()
  12.         favorited = False
  13.         latered = False
  14.         ...
  15.         return data
英文:

The error you are seeing is caused by trying to access the pk value through self.kwargs, when in fact your view is using a slug field and slug URL parameter.

Try to use self.get_object() as it gives you current instance in DetailView whether it is pk or slug so:

  1. class MangaView(DetailView):
  2.     model = Manga
  3.     template_name = &#39;mangas/manga.html&#39;
  4.     context_object_name = &#39;manga&#39;
  5.     slug_field = &#39;manga_slug&#39;
  6.     slug_url_kwarg = &#39;manga_slug&#39;
  8.     def get_context_data(self, **kwargs):
  9.         data = super().get_context_data(**kwargs)
  11.         manga = self.get_object()
  12.         favorited = False
  13.         latered = False
  14.         ...
  15.         return data

huangapple
  • 本文由 发表于 2023年2月16日 02:33:48
  • 转载请务必保留本文链接：https://go.coder-hub.com/75464089.html
  • django
  • django-queryset
  • django-urls
  • django-views
  • python
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