Since django insists on throwing a DoesNotExist rather than just returning a None from the far side of a null OneToOneField, I wrote this to have a sane way of getting those fields out without having to try/except all over in my code.
Adds Boolean like Filter in Admin to OneToOneField reference. Allowing to filter in the Parent for instances without Referenced Field. To register the filter, import in `urls.py` for example: import filterspecs Example `models.py`: from django.db import models class Place(models.Model): name = model.CharField(maxlength=50) address = model.CharField(maxlength=80) class Restaurant(meta.Model): place = model.OneToOneField(Place) place.exists_filter = True serves_hot_dogs = model.BooleanField() serves_pizza = model.BooleanField() Example `admin.py`: from django.contrib import admin from models import * class PlaceAdmin(admin.ModelAdmin): list_filter = ('restaurant',) admin.site.register(Place, PlaceAdmin) With this example PlaceAdmin will have a filter: By Restaurant All Yes No Where `Yes` will list `Place` with `Restaurant` instances, and `No` will list `Place` without `Restaurant` instances.