如何在基于Django类的Create View中将每个用户限制为每24小时只能发布一次

# middleware.py
from datetime import timedelta
from django.utils import timezone
from django.http import HttpResponseForbidden

class PostRateLimitMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        if request.user.is_authenticated and request.path == '/create-post/':
            last_post_time = request.user.profile.last_post_time
            if last_post_time and timezone.now() - last_post_time < timedelta(hours=24):
                return HttpResponseForbidden("You can only post once every 24 hours.")
        return self.get_response(request)

# models.py
from django.contrib.auth.models import User
from django.db import models

class UserProfile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    last_post_time = models.DateTimeField(null=True, blank=True)

    def __str__(self):
        return self.user.username

# views.py
from django.urls import reverse_lazy
from django.views.generic.edit import CreateView
from .models import Post
from .forms import PostForm

class PostCreateView(CreateView):
    model = Post
    form_class = PostForm
    template_name = 'post_form.html'
    success_url = reverse_lazy('post_list')

    def form_valid(self, form):
        response = super().form_valid(form)
        self.request.user.profile.last_post_time = timezone.now()
        self.request.user.profile.save()
        return response

# settings.py
MIDDLEWARE = [
    # ... other middleware classes ...
    'yourapp.middleware.PostRateLimitMiddleware',
]