Django中的UnboundedLocalError

Question

我在django中遇到UnboundedLocalError。 异常值：在赋值之前引用局部变量'comment_form'。

我使用FormForms从窗体创建评论窗体。所以这是评论窗体的views.py文件。

def post_detail(request,year,month,day,post): 
'''post=get_object_or_404(Post,slug=post,status='published',publish__year=year, 
         publish__month=month,publish__day=day)''' 
try: 
    post=Post.published.get(slug=post) 
except Post.DoesNotExist: 
    raise Http404("Post Doesnot Exist") 
#list of active comments for the post 
comments=post.comments.filter(active=True) 
if request.method=='POST': 
    #a comment was posted 
    comment_form=CommentForm(data=request.POST) 
    if comment_form.is_valid(): 
     #create comment object but dont save to database yet 
     new_comment=comment_form.save(commit=False) 
     #assign the current post to the comment 
     new_comment.post=post 
     #save the comment to database 
     new_comment.save() 
    else: 
     print (form.error) 
     comment_form=CommentForm() 

return render(request,'blog/post/detail.html',{'post':post,'comments':comments,'comment_form':comment_form}) 
'''return render(request,'blog/post/detail.html',{'post':post})''' 

模板detail.html

{% extends "blog/base.html" %} 
{% block title %}{{ post.title }}{% endblock %} 
{% block content %} 
<h1>{{ post.title }}</h1> 
<p class="date"> 
Published {{ post.publish }} by {{ post.author }} 
</p> 
{{ post.body|linebreaks }} 
(% with comments.count as total_comments %} 
<h2> 
{{total_comments}}comment{{total_comments|pluralize}} 
</h2> 
{% endwith %} 
{% for comment in comments %} 
<div class="comment"> 
    <p class="info"> 
    Comment {{forloop.counter }} by {{comment.name}} 
    {{comment.created}} 
    </p> 
    {{comment.body|linebreaks}} 
</div> 
{%empty%} 
    <p>There are nocomments yet.</p> 
{% endfor %} 
{% if new_comment %} 
<h2>Your comment has been added.</h2> 
{% else %} 
<h2>Add a new comment.</h2> 
<form action="." method="post"> 
    {{comment_form.as_p }} 
    {% csrf_token %} 
    <p><input type="submit" value="Add comment"></p> 
</form> 
{% endif %} 
{% endblock %} 

forms.py

from django import forms 
from .models import Comment 
class EmailPostForm(forms.Form): 
    name=forms.CharField(max_length=25) 
    email=forms.EmailField() 
    to=forms.EmailField() 
    comments=forms.CharField(required=False,widget=forms.Textarea) 

class CommentForm(forms.ModelForm): 
    class Meta: 
     model=Comment 
     fields=('name','body') 

我检查了所有相关的问题，但与此代码仍然出现错误。 因此对于此错误我无法加载我的网页

Answer 1

如果您的请求是POST，则只定义comment_form。您需要在该if语句之外定义它（comment_form=CommentForm()）。