Python 如何避免django integrityerror更新现有博客文章

我在我的froms.py中使用了这个干净的方法，以防止用户使用我的网站中已经存在的重复标题或标题创建博客文章。但是当我要更新我的旧博文时，我也得到了这个积分错误。看到图片了吗

如何避免更新旧博客文章的完整性错误。这是我的密码：

#froms.py

from .models import *
from django import forms
from django.core.exceptions import ValidationError
from django.db import IntegrityError

class BlogPost(forms.ModelForm):
    def clean_title(self):
             title = self.cleaned_data['title']
             if IntegrityError(title):
                 raise forms.ValidationError('This title already exists. Please use different title')
             return title
          
    class Meta:
      model = Post
      fields = ['title','author','body']
      
      widgets = {
         'title': forms.TextInput(attrs={'class':'form-control'}),
         'author': forms.Select(attrs={'class':'form-control'}),
         'body': RichTextField(),
      }
  

class blog_update_view(UpdateView):
      model = Post
      template_name = "blog_update_post.html"
      form_class = BlogPost
  
       
       

视图.py

from .models import *
from django import forms
from django.core.exceptions import ValidationError
from django.db import IntegrityError

class BlogPost(forms.ModelForm):
    def clean_title(self):
             title = self.cleaned_data['title']
             if IntegrityError(title):
                 raise forms.ValidationError('This title already exists. Please use different title')
             return title
          
    class Meta:
      model = Post
      fields = ['title','author','body']
      
      widgets = {
         'title': forms.TextInput(attrs={'class':'form-control'}),
         'author': forms.Select(attrs={'class':'form-control'}),
         'body': RichTextField(),
      }
  

class blog_update_view(UpdateView):
      model = Post
      template_name = "blog_update_post.html"
      form_class = BlogPost
  
       
       

---

我不想用slagify。只是想避免更新现有博客帖子的integrityerror。

请添加相关模型。您真的需要

if IntegrityError（title）

条件吗？我只是不太清楚原因。