Django_filters给出错误“ QuizFilter没有len（）”

Question

我有一个过滤器：

import django_filters

from .models import Quiz


class QuizFilter(django_filters.FilterSet):
    class Meta:
        model = Quiz
        fields = ['title', 'level']

class QuizList(ListView):
    """List of quizzes + pagination"""
    model = Quiz
    template_name = 'quizapp/home.html'
    context_object_name = 'quizzes'
    paginate_by = 15

    def get_queryset(self):
        qs = self.model.objects.all()
        filtered_quizzes = QuizFilter(self.request.GET, queryset=qs)
        return filtered_quizzes

打开页面时出现此错误：

在模板中，我只写{％for quizzes.qs％}中的测验，而过滤则使用{{quizzes.form.as_p}}我该如何解决这个问题？

Answer 1

您在这里返回QuizFilter，而不是其过滤后的查询集。您需要返回.qs的QuizFilter属性：

class QuizList(ListView):
    """List of quizzes + pagination"""
    model = Quiz
    template_name = 'quizapp/home.html'
    context_object_name = 'quizzes'
    paginate_by = 15

    def get_queryset(self):
        qs = self.model.objects.all()
        filtered_quizzes = QuizFilter(self.request.GET, queryset=qs)
        return filtered_quizzes.qs

如果还需要访问过滤器，则最好使用FilterView：
class QuizList(ListView):
    """List of quizzes + pagination"""
    model = Quiz
    template_name = 'quizapp/home.html'
    context_object_name = 'quizzes'
    paginate_by = 15

    def get_queryset(self):
        qs = self.model.objects.all()
        filtered_quizzes = QuizFilter(self.request.GET, queryset=qs)
        return filtered_quizzes.qs

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context.update(
            filter=QuizFilter(self.request.GET, queryset=self.model.objects.all())
        )
        return context

因此，您可以使用{{ filter.form.as_p }}渲染滤镜。