Storing a related queryset in attribute clears session

Hi,

I opened this as bug report, but I would like to get an feedback here:

https://code.djangoproject.com/ticket/20129#ticket

Copy/pasted bug report:

I have a very weird behavior with this piece of code that took me some hours to find out:

class ModelA(models.Model, AbstractModel)      ...        def items():          try:              return self._items_qs_cache          except AttributeError:              current_minute = return datetime.now().replace(second=0, microsecond=0)              self._items_qs_cache = self.children_set.filter(published=True, publish_date__lte=current_minute)              return self_items_qs_cache        parent = models.ForeignKey('self', blank=True, null=True, verbose_name=_('parent'), related_name='children_set')
 

Calling the items() function clears the session!

But, if instead you replace the following line

self._items_qs_cache = self.children_set.filter(published=True, publish_date__lte=current_minute)
 

with the following equivalent one

self._items_qs_cache = Model.objects.filter(published=True, publish_date__lte=current_minute, parent=self)
 

The session does not get cleared.

Is this a django bug or am I missing somthing.

Thank you,

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