On Thu, Dec 15, 2011 at 8:17 PM, Bernardo <jbv...@gmail.com> wrote:
> I still need to see how to combine multiple Class based views to treat
> my data.
>
The idea here is to use Mixins, i.e., classes that implement a few methods
and can be mixed with one of your main classes.
# ------------------------------------------------------------------------
# example.py
# ------------------------------------------------------------------------
from django.core.serializers.json import simplejson, DjangoJSONEncoder
class JSONMixin(object):
def get(self, context, **kwargs):
"""
On ajax requests, return a JSON object with
information provided by subclasses.
"""
if self.request.is_ajax():
self.get_data(context, **kwargs)
return HttpResponse(self.dump_data(self.data))
return super(JSONMixin, self).get(context)
def dump_data(self, data):
return simplejson.dumps(data, cls=DjangoJSONEncoder)
def get_data(self, *args, **kwargs):
"""
Subclasses must implement this, setting the 'data' attribute on the
instance which will then be dumped on the HttpResponse.
"""
raise NotImplementedError
def fail(self, msg=""):
return HttpResponseBadRequest(msg)
# ------------------------------------------------------------------------
Assuming the code above (not sure how good it is), slap this onto another
generic CBV and, as long as that view implements a get_data which sets a
value for the 'data' instance attribute, you should be able to fetch some
json through an ajax request, e.g.
# ------------------------------------------------------------------------
# views.py
# ------------------------------------------------------------------------
from example import JSONMixin
from django.contrib.auth.models import User
from django.http import HttpResponseRedirect
from django.views.generic import ListView
class UsersWithCount(JSONMixin, ListView): # note how we mix the
functionality
"""
My Simple View
""""
foo = 'bar'
def get(self, *args, **kwargs):
# the usual get() logic goes here,
# this is a very silly example
if self.foo in self.request.GET:
context = self.get_context_data(*args, **kwargs)
return self.render_to_response(context)
else:
return HttpResponseRedirect("/")
def get_data(self, *args, **kwargs):
# a different logic that creates a json-dumpable object
# and saves it in self.data
users = User.objects.all()
self.data = {'users': users, 'user_count': len(users)}
# ------------------------------------------------------------------------
Let us know if you have any more questions.
Cheers,
AT
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