如何在渲染後將數據插入模板？ （django）

Question

我正在製作一個裝飾器，將驗證碼插入到模板中。該方案如下：

@insert_verification 
def my_view(request): 
    # View code here... 
    return render(request, 'myapp/index.html', {"foo": "bar"}, 
     content_type="application/xhtml+xml") 


def insert_verification(func): 
    def wrapped(request): 
     res = func(request) 
     if type(res) == HttpResponse: 
      # add a verification code to the response 
      # just something like this : res.add({"verification": 'xxxxx'}) 
      # and varification can fill in the template 
     return res 
    return wrapped 

我用下面的模板：

{% block main %} 
<fieldset> 
    <legend>{{ title }}</legend> 
    <form method="post"{% if form.is_multipart %} enctype="multipart/form-data"{% endif %}> 

    {% fields_for form %} 
    <input type="hidden" value="{{varification}}" > 
    <div class="form-actions"> 
     <input class="btn btn-primary btn-large" type="submit" value="{{ title }}"> 
    </div> 
    </form> 
</fieldset> 
{% endblock %} 

看來我應該呈現模板，不同的字典兩次。但我不知道該怎麼做。

Answer 1

我認爲更好的方法是實施context processor將verification上下文變量添加到模板上下文中。

例如：

verification_context_processor.py

def add_verification(request): 
    #get verification code 
    ctx = {'verification': 'xxxxx'} 

    #you can also check what path it is like 
    #if request.path.contains('/someparticularurl/'): 
    # add verification 

    return ctx 

在settings.py，更新

import django.conf.global_settings as DEFAULT_SETTINGS 

TEMPLATE_CONTEXT_PROCESSORS = DEFAULT_SETTINGS.TEMPLATE_CONTEXT_PROCESSORS + (
    'custom_context_processors.add_verification', 
    ) 

查看應該使用RequestContext而呈現響應。

def my_view(request): 
    # View code here... 
    return render_to_response(request, 'myapp/index.html', {"foo": "bar"}, 
       context_instance=RequestContext(request) 
       )