django - Django:分页器错误:“用户”类型的对象没有 len()
问题描述
我正在学习使用分页器,因为我的列表真的很长!由于出现错误,我无法实现它。我注意到,如果我删除,paginate_by = 10
那么错误就会消失,但我很确定这是分页所必需的。为什么 get_queryset 与分页器冲突。
class NotificationsListView(ListView):
template_name = "notices/list.html"
paginate_by = 10
def get_context_data(self, *args, **kwargs):
context = super(NotificationsListView, self).get_context_data(*args, **kwargs)
qs = self.get_queryset().notifications.all()
paginator = Paginator(qs , self.paginate_by)
page = self.request.GET.get('page')
try:
notification_pages = paginator.page(page)
except PageNotAnInteger:
notification_pages = paginator.page(1)
except EmptyPage:
notification_pages = paginator.page(paginator.num_pages)
context['notifications'] = notification_pages
return context
def get_queryset(self, *args, **kwargs):
request = self.request
return User.objects.get(pk=self.request.user.pk)
追溯:
File "myapp\lib\site-packages\django\core\paginator.py" in count
85. return self.object_list.count()
During handling of the above exception ('User' object has no attribute 'count'), another exception occurred:
File "myapp\lib\site-packages\django\core\handlers\exception.py" in inner
35. response = get_response(request)
File "myapp\lib\site-packages\django\core\handlers\base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)
File "myapp\lib\site-packages\django\core\handlers\base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "myapp\lib\site-packages\django\views\generic\base.py" in view
69. return self.dispatch(request, *args, **kwargs)
File "myapp\lib\site-packages\django\views\generic\base.py" in dispatch
89. return handler(request, *args, **kwargs)
File "myapp\lib\site-packages\django\views\generic\list.py" in get
157. context = self.get_context_data()
File "myapp\src\notices\views.py" in get_context_data
18. context = super(NotificationsListView, self).get_context_data(*args, **kwargs)
File "myapp\lib\site-packages\django\views\generic\list.py" in get_context_data
119. paginator, page, queryset, is_paginated = self.paginate_queryset(queryset, page_size)
File "myapp\lib\site-packages\django\views\generic\list.py" in paginate_queryset
69. page = paginator.page(page_number)
File "myapp\lib\site-packages\django\core\paginator.py" in page
65. number = self.validate_number(number)
File "myapp\lib\site-packages\django\core\paginator.py" in validate_number
43. if number > self.num_pages:
File "myapp\lib\site-packages\django\utils\functional.py" in __get__
36. res = instance.__dict__[self.name] = self.func(instance)
File "myapp\lib\site-packages\django\core\paginator.py" in num_pages
95. if self.count == 0 and not self.allow_empty_first_page:
File "myapp\lib\site-packages\django\utils\functional.py" in __get__
36. res = instance.__dict__[self.name] = self.func(instance)
File "myapp\lib\site-packages\django\core\paginator.py" in count
90. return len(self.object_list)
Exception Type: TypeError at /notices/
Exception Value: object of type 'User' has no len()
解决方案
get_queryset
应该返回一个queryset
而不是一个object
。
还有另一种方法被调用get_object
,它返回一个对象。
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