I have a strange issue where prefetch_related sometimes fails to populate
related objects when using Proxy models. I believe it is a bug, but I'd
like some second opinions on what might be going on.
*Here is my example filter:*
my_filter = Activity.objects.all().prefetch_related("recording_set")
If the first item in the queryset is of a certain proxy model (in the
example below, "sms"), no prefetched objects are populated. In other words,
if the first item has "activity=sms" (and not "activity=call") then no
"recordings" are populated in ANY of the queryset items returned.
*Here are my example models:*
class Activity(models.Model):
activity = models.CharField(max_length=20, choices=ACTIVITY_CHOICES,
default='call')
class CallManager(models.Manager):
def get_queryset(self):
return super(CallManager,
self).get_queryset().filter(activity='call')
class Call(Activity):
def __init__(self, *args, **kwargs):
self._meta.get_field('activity').default = "call"
super(Call, self).__init__(*args, **kwargs)
class Meta:
proxy = True
objects = CallManager()
class SmsManager(models.Manager):
def get_queryset(self):
return super(SmsManager, self).get_queryset().filter(activity='sms')
class Sms(Activity):
def __init__(self, *args, **kwargs):
self._meta.get_field('activity').default = "sms"
super(Sms, self).__init__(*args, **kwargs)
class Meta:
proxy = True
objects = SmsManager()
class Recording(models.Model):
sms = models.ForeignKey("Sms", null=True, blank=True)
call = models.ForeignKey("Call", null=True, blank=True)
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