'books': Book.objects.filter(parent=None).order_by('sort_key_author', 'sort_key'),
'pictures': Picture.objects.order_by('sort_key_author', 'sort_key'),
'collections': Collection.objects.all(),
'books': Book.objects.filter(parent=None).order_by('sort_key_author', 'sort_key'),
'pictures': Picture.objects.order_by('sort_key_author', 'sort_key'),
'collections': Collection.objects.all(),