DeleteView不删除

Question

在为具有related model的模型实现DeleteView时遇到问题。当我尝试删除Task对象时，什么也没有发生，并且它没有重定向到success_url。注意发生。它只是继续显示模板。

这是型号：

class Project(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField()
    date_created = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(User, on_delete=models.CASCADE)

class Task(models.Model):
    name = models.CharField(max_length=50, default='New Model')
    project = models.ForeignKey(Project, on_delete=models.CASCADE)
    date_created = models.DateTimeField(default=timezone.now)

这是我的DeleteView类：

class TaskDeleteView(LoginRequiredMixin, UserPassesTestMixin, DeleteView):
    model = Task
    template_name = 'tasks/confirm_delete.html'   # template for deletion
    success_url ='/projects/'     

    # Test user permission
    def test_func(self):
        task = self.get_object()

        if self.request.user == task .project.author:
            return True
        else:
            return False

    def get_success_url(self):
        project = self.object.project
        return reverse_lazy('tasks-listview', kwargs={'pk': project.id })

和我的网址格式：

urlpatterns = [
    path('tasks/<int:pk>/list/', TasksListview.as_view(), name='tasks-listview'),
    path('tasks/<int:pk>/delete/', TaskDeleteView.as_view(), name='task-delete'),
]

这是我的删除庙宇：

<form method=" POST" enctype="multipart/form-data">
        {% csrf_token %}
        <fieldset class='form-group'>
            <h4>Current Project: {{ object.project }}</h4>
            <h4>Are you sure you want to delete task named {{ object.name }}? </h4>
        </fieldset>
        <div class="form-group">
            <button class="btn btn-danger float-sm-right mr-1" type="submit">Yes, Delete</button>
            <a class="btn btn-secondary float-sm-right mr-1" href="{% url 'task-detail' object.id %}">Cancel</a>
        </div>
    </form>

Answer 1

我的删除视图类包含：

def delete(self, request, *args, **kwargs):
    self.get_object().delete()
    messages.add_message(self.request, messages.SUCCESS, 'Entity removed with success.')
    data = {'valid': True}
    return JsonResponse(data)