python – DJANGO – 赋值前引用的局部变量’form’

发布时间：2020-12-20 11:49:50 所属栏目：Python 来源：网络整理

导读：我正在尝试使表单从用户获取信息并使用此信息发送电子邮件.这是我的代码： #forms.pyfrom django import formsclass ContactForm(forms.Form): nome = forms.CharField(required=True) email = forms.EmailField(required=True) msg = forms.CharField( requ

我正在尝试使表单从用户获取信息并使用此信息发送电子邮件.这是我的代码：

#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,['testmail@gmail.com'],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 %}

当我尝试进入联系页面时,我收到此错误：

local variable 'form' referenced before assignment

enter image description here

它说错误是在这行views.py中：

return render(request,{'form': form})

我对Django有点新意,能帮帮我吗？

解决方法

如果request.method ==’POST’：block,则在此定义表单变量.
如果您使用GET请求访问视图,则表单未定义.
您应该将视图更改为以下内容：

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',{'form': form})

（编辑：李大同）

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