Немного изменил пример из книги дронова модель: class Bb(models.Model):

Question

Немного изменил пример из книги дронова модель: class Bb(models.Model):

image = models.ImageField(upload_to=get_timestamp_path, verbose_name='image')
author = models.ForeignKey(AdvUser, on_delete=models.CASCADE, verbose_name='author')
created_at = models.DateTimeField(auto_now_add=True, db_index=True, verbose_name='date')
tags = TaggableManager()

def delete(self, *args, **kwargs):
for ai in self.additionalimage_set.all():
ai.delete()
super().delete(*args, **kwargs)

def get_queryset(self):
return super().get_queryset().all()

class Meta:
verbose_name_plural = 'Posts'
verbose_name = 'Post'
ordering = ['-created_at']

контроллер:
def listview(request, pk):
rubric = get_object_or_404(Bb, pk=pk)
bbs = Bb.objects.all()

if 'keyword' in request.GET:
keyword = request.GET['keyword']
q = Q(title__icontains=keyword) | Q(content__icontains=keyword)
bbs = bbs.filter(q)
else:
keyword = ''
form = SearchForm(initial={'keyword': keyword})

paginator = Paginator(bbs, 2)
if 'page' in request.GET:
page_num = request.GET['page']
else:
page_num = 1
page = paginator.get_page(page_num)
context = {'rubric': rubric, 'page': page, 'bbs': page.object_list, 'form': form}
return render(request, 'main/by_rubric.html', context)

Ожидал список всех пикч, но получил крайне странное поведение :/
в чем ошибка?