id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 17541,Unexpected ForeignKey Behavior with self.pk == None,Peter Sheats,anonymous,"I'm not sure if this is technically a bug but I wanted to report it because it really surprised me today. {{{ class Manufacturer(models.Model): name = models.CharField(blank=True, max_length=100) class Car(models.Model): manufacturer = models.ForeignKey(Manufacturer, blank=True, null=True) name = models.CharField(blank=True, max_length=100) Car.objects.create(name='Accord') Car.objects.create(name='Civic') print Manufacturer().car_set.all().count() >>> 2 }}} Even though neither Car is related to a Manufacturer, they are both returned through the related qs. I'm assuming this is because the query looks something like this: {{{ manufacturer = Manufacturer() Car.objects.filter(manufacturer=manufacturer.id) }}} I would say it is incorrect behavior to return anything through that related queryset that is not explicitly related. ",Bug,closed,"Database layer (models, ORM)",1.3,Release blocker,fixed,,anssi.kaariainen@…,Accepted,1,0,0,0,0,0