Queryset which uses defer() method not serialize in Json

[eguevara2012@…]

Hello!
I have this function using json and a queryset with defer() method, but the fields not target in queryset, i need only "id" and "nome":

models.py

class Pessoa(models.Model):
    nome = models.CharField(max_length=50)
    data_nascimento = models.DateField()
    data_inclusao = models.DateField()
    cpf = models.CharField(max_length=14)
    telefone = models.CharField(max_length=13)
    celular = models.CharField(max_length=13)
    
    class Meta:
        abstract = True

class Proprietario(Pessoa):  
    endereco = models.ForeignKey(Endereco)

    def __unicode__(self):
            return "%s, %s" % (self.nome, self.cpf)

views.py:

def load_proprietarios(request):
    data = serializers.serialize('json',Proprietario.objects.defer('cpf','telefone','celular','data_nascimento','data_inclusao',),ensure_ascii=False))
    return HttpResponse(data, mimetype="application/javascript")

This is the output:

[{"pk": 1, "model": "proprietario.proprietario_deferred_celular_cpf_telefone_data_inclusao_data_nascimento", "fields": {}}]

Note that the "id" and the "nome" fields (class Proprietario / class abstract Pessoa) does not appear after defer() method.

Regards.