django render_to_string 缺少信息

为什么我的电子邮件（正文部分）不包含该消息？

这是我的代码：

message = render_to_string('contact_template.txt', {'contact_name':   contact_name, 'contact_email': contact_email, 'form_content': content}, context_instance=RequestContext(request))
email = EmailMessage("New contact form submission", message, "[email protected] /cdn-cgi/l/email-protection" +'', ['[email protected] /cdn-cgi/l/email-protection'], headers = {'Reply-To': contact_email })
email.send()

我的模板（contact_template.txt），（我收到的所有电子邮件都包含此内容，但没有消息）：

Contact Name:


Email:


Content:

和我的观点：（我不得不说这很吓人......）

from polls.forms import ContactForm
from django.core.mail import EmailMessage
from django.template import Context, Template, RequestContext
from django.shortcuts import render
from django.shortcuts import redirect
from django.core.mail import send_mail, BadHeaderError
from django.http import HttpResponse, HttpResponseRedirect
from django.template.loader import render_to_string, get_template

def index(request):
    return HttpResponse("Hello, world. You're at the poll index.")

def contact(request):
    form_class = ContactForm

    # logic!
    if request.method == 'POST':
        form = form_class(data=request.POST)

        if form.is_valid():
            contact_name = request.POST.get('contact_name', '')
            contact_email = request.POST.get('contact_email', '')
            content = request.POST.get('content', '')         
        
            message = render_to_string('contact_template.txt', {'contact_name': contact_name, 'contact_email': contact_email, 'form_content': content}, context_instance=RequestContext(request))
        
            email = EmailMessage("New contact form submission", message, "[email protected] /cdn-cgi/l/email-protection" +'', ['[email protected] /cdn-cgi/l/email-protection'], headers = {'Reply-To': contact_email })
            email.send()
            return redirect('contact')

    return render(request, 'contact.html', {'form': form_class,})

为了清楚起见，我会尝试限制每行的最大字符数。这使得阅读render_to_string https://docs.djangoproject.com/en/3.0/topics/templates/#django.template.loader.render_to_string线路非常困难，并且更难发现错误。

from django.template.loader import render_to_string

context = {
    'contact_name': contact_name, 
    'contact_email': contact_email, 
    'form_content': content
}
message = render_to_string('contact_template.txt', context, 
                           context_instance=RequestContext(request))

您似乎缺少模板中要打印变量的位置。您定义以下变量：

• '联系人姓名'
• '联系电子邮件'
• '表单内容'

然而，它们并未在模板中使用。例子：

Contact Name:
{{ contact_name }}

Email:
{{ contact_email }}

Content:
{{ form_content }}