尝试使访问计数器+ IP在django博客的CBV中是唯一的

from django.db import models

class BlogPost(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    visit_count = models.PositiveIntegerField(default=0)
    ip_address = models.GenericIPAddressField(null=True, blank=True)

from django.views.generic.detail import DetailView
from .models import BlogPost

class BlogPostDetailView(DetailView):
    model = BlogPost
    template_name = 'blogpost_detail.html'

    def get(self, request, *args, **kwargs):
        blogpost = self.get_object()

        # 检查IP是否已经访问过该博客文章
        if request.META.get('HTTP_X_FORWARDED_FOR'):
            ip_address = request.META.get('HTTP_X_FORWARDED_FOR').split(',')[-1].strip()
        else:
            ip_address = request.META.get('REMOTE_ADDR')

        if blogpost.ip_address != ip_address:
            # 更新访问计数器和IP地址
            blogpost.visit_count += 1
            blogpost.ip_address = ip_address
            blogpost.save()

        return super().get(request, *args, **kwargs)

from django.urls import path
from .views import BlogPostDetailView

urlpatterns = [
    path('blog/<int:pk>/', BlogPostDetailView.as_view(), name='blogpost_detail'),
]