+ objects = only_author = None
+ categories = {}
+
+ if theme_is_set:
+ shelf_tags = [tag for tag in tags if tag.category == 'set']
+ fragment_tags = [tag for tag in tags if tag.category != 'set']
+ fragments = models.Fragment.tagged.with_all(fragment_tags)
+
+ if shelf_tags:
+ books = models.Book.tagged.with_all(shelf_tags).order_by()
+ l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
+ fragments = models.Fragment.tagged.with_any(l_tags, fragments)
+
+ # newtagging goes crazy if we just try:
+ #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
+ # extra={'where': ["catalogue_tag.category != 'book'"]})
+ fragment_keys = [fragment.pk for fragment in fragments]
+ if fragment_keys:
+ related_tags = models.Fragment.tags.usage(counts=True,
+ filters={'pk__in': fragment_keys},
+ extra={'where': ["catalogue_tag.category != 'book'"]})
+ related_tags = (tag for tag in related_tags if tag not in fragment_tags)
+ categories = split_tags(related_tags)
+
+ objects = fragments
+ else:
+ if shelf_is_set:
+ objects = models.Book.tagged.with_all(tags)
+ else:
+ 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
+
+ if not objects:
+ only_author = len(tags) == 1 and tags[0].category == 'author'
+ objects = models.Book.objects.none()
+
+ return object_list(