- objects = models.Book.tagged_top_level(tags)
-
- # get related tags from `tag_counter` and `theme_counter`
- related_counts = {}
- tags_pks = [tag.pk for tag in tags]
- for book in objects:
- for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
- if tag_pk in tags_pks:
- continue
- related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
- related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
- related_tags = [tag for tag in related_tags if tag not in tags]
- for tag in related_tags:
- tag.count = related_counts[tag.pk]
-
- categories = split_tags(related_tags)
- del related_tags
+ pictures = Picture.objects.none()
+
+ if literature and books.count() > 0:
+ # get related tags from `tag_counter` and `theme_counter`
+ related_counts = {}
+ tags_pks = [tag.pk for tag in tags]
+ for book in books:
+ for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
+ if tag_pk in tags_pks:
+ continue
+ related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
+ related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
+ related_tags = [tag for tag in related_tags if tag not in tags]
+ for tag in related_tags:
+ tag.count = related_counts[tag.pk]
+
+ categories = split_tags(related_tags)
+ del related_tags
+
+ objects = MultiQuerySet(pictures, books)