Make Django Models and QuerySets json serializable

gistfile1.py

from django.core.serializers.json import DjangoJSONEncoder
from django.db.models import Model
from django.db.models.query import QuerySet
from django.forms import model_to_dict


class ExtendedDjangoJSONEncoder(DjangoJSONEncoder):
    def default(self, o):
        if hasattr(o, 'to_dict'):
            return o.to_dict()
        elif issubclass(o.__class__, Model):
            return model_to_dict(o)
        elif issubclass(o.__class__, QuerySet):
            return [self.default(m) for m in o]
        else:
            return super(ExtendedDjangoJSONEncoder, self).default(o)