从中间件传递变量到模板 [英] Pass variable from middleware to templates

问题描述

我是Django的首发。到目前为止，我从视图中学习了传递变量到模板。但现在我需要传递变量到我的主要布局。我可以在每个页面的def中看到它。但它的重复太多了。所以我开始了解中间件。

我创建了middlewares.py并将其包含在设置中。在middlewares.py文件中，如何将变量传递给我的主要布局？

下面是我当前的middlewares.py内容，我尝试了很多方法并对它们进行了评论，因为不工作。

  from django.db import connections 
 from django.shortcuts import render，redirect 
 
 class NotificationsMiddleware（object）：
 def process_view（self，request，view_func，view_args，view_kwargs）：
 
 request.context_data ['notification_count'] = 2 
 response = view_func（request，* view_args，** view_kwargs）
 
返回响应
 
＃def process_request（self，request）：
＃request.notification_count = 2 
 $ return 
 
＃def process_template_response（self，request，response）：
＃＃response.context ['notification_count'] = 2 
＃response.context_data ['notification_count '] = 2 
＃＃return response 
＃return render（request， main / locations.html'）
  

解决方案

您可以创建一个模板上下文处理器，首先使用一个方法创建一个Python文件，该方法返回一个您需要的信息的字典，然后使用您的示例在项目设置中添加到该文件的路由：

在您的应用程序上创建一个文件 context_processors.py ：

  from myapp.models import MyModel 
 
 def my_context（request）：
 context_data = dict（）
 context_data ['notification_count'] = MyModel.objects.all（）。count（）
 return context_data 
  

在您的 settings.py

中添加上下文处理器

  TEMPLATE_CONTEXT_PROCESSORS =（
＃... 
'myapp.context_proccessors.my_context'，
）
  

您可以在任何模板中使用变量：

 < p> Count：{{notification_count }}< / p为H. 
  

I'm Django starter. So far I learned pass variable from view to template. But now I need pass variable to my main layout. I can pass it in each page's def in view. But its too much duplication. So I started learn about middleware.

I created middlewares.py and included it in settings. In middlewares.py file, how to pass variable to my main layout?

Below is my current middlewares.py content, I tried many ways and commented them out, because not working.

from django.db import connections
from django.shortcuts import render, redirect

class NotificationsMiddleware(object):
    def process_view(self, request, view_func, view_args, view_kwargs):

        request.context_data['notification_count'] = 2
        response = view_func(request, *view_args, **view_kwargs)

        return response

    # def process_request(self, request):
    #     request.notification_count = 2
    #     return

    # def process_template_response(self, request, response):
    #     # response.context['notification_count'] = 2
    #     response.context_data['notification_count'] = 2
    #     # return response
    #     return render(request, 'main/locations.html')

解决方案

You may create a template context processor, first create a python file with a method that returns a dictionary with the info you need then add the route to this file in your project settings, using your example:

create a file context_processors.py on your app:

 from myapp.models import MyModel

 def my_context(request):
    context_data = dict()
    context_data['notification_count'] = MyModel.objects.all().count()
    return context_data

The add the context processor in your settings.py

TEMPLATE_CONTEXT_PROCESSORS = (
    #  ...
    'myapp.context_proccessors.my_context',
)

The you can use the 'variable' in any template:

<p>Count: {{ notification_count }}</p>

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