missing fields of base class django serializer - django

Question

I have few classes:
class Correspondent(models.Model):
title = models.CharField(max_length=60)
class Subject(models.Model):
title = models.CharField(max_length=60)
class Letter(models.Model):
correspondent = models.ForeignKey(Correspondent,
on_delete=models.SET_NULL, null=True)
subject = models.ForeignKey(Subject, on_delete=models.SET_NULL, null=True)
description = models.TextField(max_length=600, blank=True)
case_number = models.CharField(max_length=100, blank=True)
inventory_number = models.CharField(max_length=100, blank=True)
note = models.TextField(max_length=300, blank=True)
user = models.ForeignKey(User, editable=False, on_delete=models.SET_NULL, null=True)
date = models.DateField(default=datetime.date.today)
date_creation = models.DateTimeField(auto_now_add=True)
class IncomingLetter(Letter):
response_to = models.ForeignKey('OutgoingLetter', on_delete=models.SET_NULL, null=True, blank=True)
outgoing_number = models.CharField(max_length=120, blank=True)
incoming_number = models.CharField(max_length=120, blank=True)
class OutgoingLetter(Letter):
response_to = models.ForeignKey(IncomingLetter, on_delete=models.SET_NULL, null=True, blank=True)
outgoing_number = models.CharField(max_length=120, blank=True)
and in a view i trying to send json with serialized class B instances:
from django.http import JsonResponse
from django.core import serializers
from .models import IncomingLetter
def index(request):
....
some_data = IncomingLetter.objects.all()
serialized_data = serializers.serialize('json', some_data)
return JsonResponse(json.dumps(serialized_data), safe=False)
and response missed all Letter fields in json. Is there a way to not serialize it manually?
serialized_data == {"model": "letters.incomingletter", "pk": 4, "fields": {"response_to": 3, "outgoing_number": "12312321", "incoming_number": "123123"}}
SOLVED # (not sure)
I wrote simple serializer, but not sure is this cleanest way(many unnecessary fields, but it easy to clean):
class LetterSerializer:
def __init__(self):
self.serialized_data = {}
def serialize(self, data):
for idx, instance in enumerate(data):
serialized_instance_data = {}
for key, value in instance.__dict__.items():
serialized_instance_data[key] = str(value)
self.serialized_data[idx] = serialized_instance_data
return self.serialized_data