CODEWITHSUNDEEP
djangomiddleware
ginad
ginad

Reputation: 1973

help with process_template_response django middleware

I'm trying to write a django middleware using process_template_response but I seems like it's not working, can anybody help me with this or maybe give an example on how to use the method.

below is my code:

class MiddleWare(object):
    def process_template_reponse(self, request, response):
        response.context_data = dict(title='title')
        response.template_name = 'pages/helloworld.html'
        return response

in settings.py

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'proj.app.middleware.MiddleWare', # here my middleware
)

in template

<!-- nothing is showing -->
{% block title %}{{ title }}{% endblock %}

by the way I'm using Django 1.3 rc 1

Thanks

Upvotes: 7

Views: 6890

Answers (4)

Carlos Roso
Carlos Roso

Reputation: 1495

TL;DR: You must render your templates with TemplateResponse:

from django.template.response import TemplateResponse

def myView(request):
    context = {'foo':'foo_value'}
    return TemplateResponse(request,'foo.html', context)

The problem arises when you render your templates with the good old render imported from django.shorcuts. As stated in the documentation for process_template_response(), this hook gets called when the response is a TemplateResponse or equivalent. So what you should do is to use TemplateResponse to render your templates and your middleware will work.

You can also alias TemplateResponse as render so you don't have to change all your views. I personally don't recommend this.

from django.template.response import TemplateResponse as render

Upvotes: 7

Marwan Alsabbagh
Marwan Alsabbagh

Reputation: 26788

Here is a working example of a simple middleware that uses the process_template_response method.

class ExampleMiddleware(object):
    def process_template_response(self, request, response):
        response.context_data['title'] = 'We changed the title'
        return response

This middleware changes the value of the title variable in the template context data. Install this middleware by adding it to MIDDLEWARE_CLASSES in your settings file. Then visit any page in the django admin app you should see the title of the page change to We changed the title.

Upvotes: 5

ginad
ginad

Reputation: 1973

I've solved my problem creating a custom template tag. I'm just wondering on how to add a context variable using a process_template_reponse in a middleware.

Upvotes: 2

Yuji &#39;Tomita&#39; Tomita
Yuji &#39;Tomita&#39; Tomita

Reputation: 118458

http://docs.djangoproject.com/en/dev/topics/http/middleware/#process-template-response

Are you using the new SimpleTemplateResponse response classes?

Your view must return SimpleTemplateResponse or subclass for the new process_template_response middleware hook to work.

Copied from the docs:

def my_view(request):
    # Create a response
    response = TemplateResponse(request, 'mytemplate.html', {})
    # Register the callback
    response.add_post_render_callback(my_render_callback)
    # Return the response
    return response

Upvotes: 7

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