Question

我的views.py中的代码在仍然不是模板格式时工作正常

def detail(request, entity_group_id):
    entity_group = get_object_or_404(EntityGroup, pk=entity_group_id) # noqa
    entity_list = entity_group.members.order_by('name')
    context = {
        'entity_group': entity_group,
        'entity_list': entity_list,
    }
    return render(request, 'core/detail.html', context)

当我将其更改为Generic View时，会出现NoReverseMatch ......

class DetailView(generic.DetailView):
    model = EntityGroup
    template_name = 'core/detail.html'

    def get_context_data(self, **kwargs):
        context = super(DetailView, self).get_context_data(**kwargs)
        context['entity_group'] = EntityGroup
        context['entity_list'] = EntityGroup.members
        return context

这是我的models.py

class Entity(models.Model):
    name = models.CharField(max_length=30)


class EntityGroup(models.Model):
    name = models.CharField(max_length=20)
    members = models.ManyToManyField(Entity, through='Membership')

class Membership(models.Model):
    entity_group = models.ForeignKey(EntityGroup, on_delete=models.PROTECT, null=False)
    entity = models.ForeignKey(Entity, on_delete=models.PROTECT, null=False)

如何在通用视图上设置反转？

这是urls.py

from django.urls import path

from . import views

app_name = 'core'
urlpatterns = [
    # # path('', views.index, name='index'),
    # path('<int:entity_group_id>/', views.detail, name='detail'),
    # path('<int:entity_group_id>/results/', views.results, name='results'),
    # path('<int:entity_group_id>/vote/', views.vote, name='vote'),
    path('', views.IndexView.as_view(), name='index'),
    path('<int:pk>/', views.DetailView.as_view(), name='detail'),
    path('<int:pk>/results/', views.ResultsView.as_view(), name='results'),
    path('<int:entity_group_id>/vote/', views.vote, name='vote'),
]

这是要求的回溯：

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\handlers\exception.py" in inner
  35.             response = get_response(request)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\handlers\base.py" in _get_response
  158.                 response = self.process_exception_by_middleware(e, request)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\core\handlers\base.py" in _get_response
  156.                 response = response.render()

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\response.py" in render
  106.             self.content = self.rendered_content

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\response.py" in rendered_content
  83.         content = template.render(context, self._request)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\backends\django.py" in render
  61.             return self.template.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render
  175.                     return self._render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in _render
  167.         return self.nodelist.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\loader_tags.py" in render
  155.             return compiled_parent._render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in _render
  167.         return self.nodelist.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\loader_tags.py" in render
  67.                 result = block.nodelist.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render
  943.                 bit = node.render_annotated(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\base.py" in render_annotated
  910.             return self.render(context)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\template\defaulttags.py" in render
  447.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\urls\base.py" in reverse
  88.     return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))

File "C:\Users\acer-1\AppData\Local\Programs\Python\Python36\lib\site-packages\django\urls\resolvers.py" in _reverse_with_prefix
  632.         raise NoReverseMatch(msg)

Exception Type: NoReverseMatch at /core/2/
Exception Value: Reverse for 'vote' with arguments '(None,)' not found. 1 pattern(s) tried: ['core\\/(?P<entity_group_id>[0-9]+)\\/vote\\/$']

我有一个投票视图，可以在更改模板中的详细信息视图之前正常工作，这就是为什么我没有在此处发布。

Answer 1

在原始视图中，您明确地将EntityGroup对象实例传递给模板。

entity_group = get_object_or_404(EntityGroup, pk=entity_group_id)

context = {
    'entity_group': entity_group

但是在你的新DetailView中，你传递的是EntityGroup类，而不是对象实例。

context['entity_group'] = EntityGroup

因此，当模板尝试根据无法查找的ID呈现URL时，可能会触发NoReverseMatch。

在新的DetailView中，尝试传递对象实例。

context['entity_group'] = self.get_object()

通过模型

1 个答案: