Django Vingd

Django Vingd enables integrating Vingd into django project.

Basic setup

1. Add "django_vingd" to INSTALLED_APPS.
2. Configure django settings:

VINGD_SETTINGS = {
    'sandbox': {
        'VINGD_USR': 'test@knopso.com',
        'VINGD_PWD': '123',
    }
}
VINGD_MODE = 'sandbox'

3. In any django app that uses vingd define Vingd Orders details (models.py):

# Imaginary scenario where users are voting for candidates via vingd.

from django.db import models
from django.http import HttpResponseRedirect
from django_vingd.models import VingdOrder

class Candidate(models.Model):
    name = models.CharField(max_length=128)
    votes = models.IntegerField(default=0)

    def add_vote(self):
        Candidate.objects.filter(id=self.id).update(votes=models.F('votes')+1)
        self.votes += 1

class VoteOrder(VingdOrder):
    candidate = models.ForeignKey(Candidate)

    # Short object description
    def get_display_name(self):
        return 'Vote for candidate'

    # Handle form submission (before sending user to vingd)
    def take_order(self):
        self.candidate_id = self.request.POST.get('candidate_id')

    # Determine vingd price
    def get_vingd_amount(self):
        return 75   # 0.75 vingd

    # Access is confirmed (user has returned back from vingd)
    def accept_order(self):
        self.candidate.add_vote()

    # Serve requested content to user
    def success_response(self):
        return HttpResponseRedirect('/')

4. Register order classes in your urls (urls.py):

from django_vingd.models import VingdMeta
from base.models import VoteOrder

VingdMeta.register([VoteOrder, ])

urlpatterns = patterns('',
    (r'^vgd/', include('django_vingd.urls')),
)

5. In HTML template place vingd order forms:

{% for candidate in candidates %}
    <form action="{% url vingd_order "VoteOrder" %}" method="POST">
        {% csrf_token %}
        {{ candidate.name }}: {{ candidate.votes }}
        <input type="hidden" name="candidate_id" value="{{ candidate.id }}">
        <input type="submit" value="vote">
    </form>
{% endfor %}

Sync database and start your engines!

Popup version

1. Add jQuery to your page.
2. Add popup related javascript to HTML head:

{% load vingd_tt %}
{% vingd_scripts %}

<script type="text/javascript">
    $(document).ready(function(){
        $('form').vingd_popup(function(data){
            alert('Vote added!');
        }, function(data){
            alert('Failed to add vote.');
        });
    });
</script>

3. Handle ajax requests in your VoteOrders (models.py):

from django_vingd.util import HttpResponseJSON
# ...
def success_response(self):
    request = self.request
    if request.is_ajax():
        return HttpResponseJSON({
            'ok': True,
            'votes': self.candidate.votes,
        })
    return HttpResponseRedirect('/')

Deny access to content

In some situations user should not be allowed to access content. Such cases should be handled both for:

• denying access at vingd ordering time (before sending user to vingd)
• denying access at vingd verification time (after user has returned from vingd).

In those cases one should raise exception within take_order and accept_order respectively.

Handling exceptions

To gracefully handle any kind of exception one should use VingdOrder handle_exception function:

def handle_exception(self, e):
    # log exception
    # inform user
    return HttpResponse("Inform user that something has gone wrong.")