python - Django 要求定义 `model`，而它已经定义了

Question

我已经在我的 View 中定义了 model = Post。但仍然要求定义模型或查询集!那我哪里做错了？

View .py

from .models import Post
from django.views.generic import ListView
# Create your views here.
class PostList(ListView):
    model = Post
    template_name = 'home.html'

url.py

from django.urls import path
from . import views
urlpatterns = [
    path('',views.ListView.as_view(),name ='list')
]

回溯错误

File "D:\django\blog_env\lib\site-packages\django\core\handlers\exception.py" in inner
  35.             response = get_response(request)

File "D:\django\blog_env\lib\site-packages\django\core\handlers\base.py" in _get_response
  128.                 response = self.process_exception_by_middleware(e, request)

File "D:\django\blog_env\lib\site-packages\django\core\handlers\base.py" in _get_response
  126.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "D:\django\blog_env\lib\site-packages\django\views\generic\base.py" in view
  69.             return self.dispatch(request, *args, **kwargs)

File "D:\django\blog_env\lib\site-packages\django\views\generic\base.py" in dispatch
  89.         return handler(request, *args, **kwargs)

File "D:\django\blog_env\lib\site-packages\django\views\generic\list.py" in get
  142.         self.object_list = self.get_queryset()

File "D:\django\blog_env\lib\site-packages\django\views\generic\list.py" in get_queryset
  39.                     'cls': self.__class__.__name__

Exception Type: ImproperlyConfigured at /
Exception Value: ListView is missing a QuerySet. Define ListView.model, ListView.queryset, or override ListView.get_queryset().

Answer 1

您定义了一个 PostList View 类，但忘记使用该基于类的 View ，而是使用了 ListView 父类。因此，您需要替换:

from django.urls import path
from . import views
urlpatterns = [
    path('',<s>views.ListView.as_view()</s>,name ='list')
]

与:

from django.urls import path
from . import views
urlpatterns = [
    path('', views.<b>PostList</b>.as_view(),name ='list')
]

否则 Django 将使用 ListView 类，并且该类(故意)缺少 model 和 queryset 属性，因为这个想法是在真实(非抽象)基于类的 View 级别指定它。