How to Retrieve Query String Parameters with Django

Django: How to Retrieve Query String Parameters

If you use Django you will surely know that its url routing is quite strict regarding the prettiness of its URLS.

An url that in a php application could be like:

"index.php?option=content&id=7"

With django would translate:

/content/7/

The nice thing is that this pretty django URLs don't cause significant overhead, at least not as by doing the same with Php, MySQL and Apache (example: Joomla).

So how to retrieve query string params with Django?

There are still cases in we need to handle query string parameters, like when dealing with external services that return a URL like:

callback?verification_code=088145235648fs689sa56h&userid=854

Following this example, create the "callback" URL in your urlconf:

# urls.py

from django.conf.urls.defaults import *

# import your view to pass to the URL
from views import callback

urlpatterns = patterns('',
    url(r'^callback$', view=callback, name='callback'),
	# your other URLS
	#
	#
)

Then create the view that retrieves the parameters:

# views.py

from django.template import Context, RequestContext
from django.shortcuts import render_to_response, get_object_or_404

# your other views
#
#

# callback
def callback(request):

    verification_code = request.GET.get('verification_code')
    userid = request.GET.get('userid')

    context = {
        'verification_code': verification_code,
        'userid': verification_url,
    }

    return render_to_response('callback.html', context, context_instance=RequestContext(request))

And then create the template that shows the result. Be sure to put in one of your TEMPLATE_DIRS.

<!-- callback.html -->

verification_code: {{ verification_code }}<br />
verification_url: {{ userid }}

Very easy indeed and Django takes care of filtering the data to avoid XSS attacks or SQL Injection automatically for you! Isn't that nice?

Comments

1.
Kerala said:

( on 2nd of May 2012 at 12:58 )

“I just wanted to say that your blog has been really useful.”

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