DJANGO-赋值之前引用的局部变量“ form” [英] DJANGO - local variable 'form' referenced before assignment

问题描述

我正在尝试使一个表单从用户那里获取信息，并使用该信息发送电子邮件。这是我的代码：

 ＃forms.py 
 from django导入表单
 
类ContactForm （forms.Form）：
 nome =形式.CharField（必填=真）
电子邮件=形式.EmailField（必填=真）
 msg =形式.CharField（
 required =是的，
 widget = forms.Textarea 
）
 
＃views.py 
 from django.shortcuts import render，redirect，get_object_or_404，HttpResponseRedirect，render_to_response 
从django.core.mail导入send_mail 
从.forms导入ContactForm 
 
 def contato（request）：
 form_class = ContactForm 
如果request.method =='POST '：
 form = form_class（request.POST）
 if form.is_valid（）：
 nome = request.POST.get（'nome'）
电子邮件= request.POST .get（'email'）
 msg = request.POST.get（'msg'）
 
 send_mail（'Subject here'，msg，email，['[e-mail]' ]，fail_silently = False）
返回HttpResponseRedirect（'blog / inicio'）
 return render（request，'blog / inicio.html'，{'form'：form}）
 
 
＃contato.html 
 {％扩展 blog / base.html％} 
 {％块内容％} 
 
< form role = form action = method = post > 
 {％csrf_token％} 
 {{form.as_p}} 
< button type = submit&Submit;< / button> 
< / form> 
 {％endblock％} 
  

当我尝试进入联系页面时，我得到了错误：

 赋值
   
 
 
  
 
 
 
这是说错误在于views.py：
  return render（request，'blog / inicio.html'，{'form'：form}）
  
我对Django有点陌生，请您帮我吗？
解决方案
您可以在此 if request.method ==中定义 form 变量。 'POST'：块。 
如果通过GET请求访问视图，则未定义表单。 
您应该将视图更改为以下内容：
  def contato（request）：
 form_class = ContactForm 
＃如果请求未发布，则初始化一个空表单
 form = form_class（request.POST或None）
如果request.method =='POST'：
 
 if form.is_valid（）：
 nome = request.POST.get（'nome'）
电子邮件= request.POST.get（'email'）
 msg = request.POST .get（'msg'）
 
 send_mail（'Subject here'，msg，email，['[e-mail]']，fail_silently = False）
 return HttpResponseRedirect（'blog / inicio'）
 return render（request，'blog / inicio.html'，{'form'：form}）
  
 
I'm trying to make a form get information from the user and use this information to send a email. Here's my code:
#forms.py
from django import forms

class ContactForm(forms.Form):
    nome = forms.CharField(required=True)
    email = forms.EmailField(required=True)
    msg = forms.CharField(
        required=True,
        widget=forms.Textarea
    )

#views.py
from django.shortcuts import render, redirect, get_object_or_404, HttpResponseRedirect, render_to_response
from django.core.mail import send_mail
from .forms import ContactForm

def contato(request):
    form_class = ContactForm
    if request.method == 'POST':
        form = form_class(request.POST)
        if form.is_valid():
            nome = request.POST.get('nome')
            email = request.POST.get('email')
            msg = request.POST.get('msg')

            send_mail('Subject here', msg, email, ['[e-mail]'], fail_silently=False)
            return HttpResponseRedirect('blog/inicio')
    return render(request, 'blog/inicio.html', {'form': form})


#contato.html
{% extends "blog/base.html" %}
{% block content %}

                    <form role="form" action="" method="post">
                        {% csrf_token %}
                        {{ form.as_p }}
                        <button type="submit">Submit</button>
                    </form>
{% endblock %}
and when I try to enter in contact page I get this error:
local variable 'form' referenced before assignment


It is saying tha the error is in this line of views.py:
return render(request, 'blog/inicio.html', {'form': form})
I'm a little new on Django, can you please help me?
解决方案
You define the form variable in this if request.method == 'POST': block. 
If you access the view with a GET request form gets not defined. 
You should change the view to something like this:
def contato(request):
    form_class = ContactForm
    # if request is not post, initialize an empty form
    form = form_class(request.POST or None)
    if request.method == 'POST':

        if form.is_valid():
            nome = request.POST.get('nome')
            email = request.POST.get('email')
            msg = request.POST.get('msg')

            send_mail('Subject here', msg, email, ['[e-mail]'], fail_silently=False)
            return HttpResponseRedirect('blog/inicio')
    return render(request, 'blog/inicio.html', {'form': form})


                        
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