Serializar detalhamento ou listagem de dados customizados em json com CBV

json_response.py

# API JSON
from django.http import HttpResponse
from django.utils import simplejson
from django.views.generic.detail import BaseDetailView
from django.views.generic.list import BaseListView
from django.db.models.query import QuerySet

class JSONResponseMixin(object):
    def render_to_response(self, context):
        return self.get_json_response(self.convert_context_to_json(context))

    def get_json_response(self, content, **httpresponse_kwargs):
        return HttpResponse(content, content_type='application/json', **httpresponse_kwargs)

    def convert_context_to_json(self, context):
        return simplejson.dumps(context)


class JSONDetailView(JSONResponseMixin, BaseDetailView):
    def render_to_response(self, context):
        obj = context['object'].as_dict()
        return JSONResponseMixin.render_to_response(self, obj)


class JSONListView(JSONResponseMixin, BaseListView):
    def render_to_response(self, context):
        obj_list = list(self.model.objects.values())
        return JSONResponseMixin.render_to_response(self, obj_list)

models.py

from django.db import models

class Estado(models.Model):
    sigla = models.CharField(max_length=2)
    

    class Meta:
        ordering = ['sigla']
    

    @property
    def cidades(self):
        cidades = self.cidade_set.all()
        clist = []
        
        for cidade in cidades:
            clist.append(
                {'pk': cidade.pk, 'nome': cidade.nome}
            )
            
        return clist


    def __unicode__(self):
        return self.sigla
    

    def as_dict(self):
        return {
            'pk': self.pk,
            'sigla': self.sigla,
            'cidades': list(self.cidades),
        }

urls.py

# coding=utf-8
from django.conf.urls import patterns, url
from address.models import Estado
from core.api.json_response import JSONDetailView, JSONListView

urlpatterns = patterns('',
    url(r'^estado/(?P<pk>\d)$', JSONDetailView.as_view(model=Estado), name="estado"),
    url(r'^estados/$', JSONListView.as_view(model=Estado), name="estados"),
)