Django Views - How to serialize an array of django objects into flat JSON (exclude model, pk, and fields node)

django-json-serialize.py

import json
from django.forms.models import model_to_dict
from django.core.serializers.json import DjangoJSONEncoder

events = [some django model query]
# convert every object into a dictionary
data = map(lambda evt: model_to_dict(evt), events)

return HttpResponse(json.dumps(data, cls=DjangoJSONEncoder),
                        content_type="application/json")

This serialization method can't serialize any type of FileField.