- books_by_first_letter = SortedDict()
- for book in books:
- books_by_first_letter.setdefault(book.title[0], []).append(book)
+ books_by_parent = {}
+ books = models.Book.objects.all().order_by('parent_number', 'title').only('title', 'parent', 'slug')
+ if filter:
+ books = books.filter(filter).distinct()
+ book_ids = set((book.pk for book in books))
+ for book in books:
+ parent = book.parent_id
+ if parent not in book_ids:
+ parent = None
+ books_by_parent.setdefault(parent, []).append(book)
+ else:
+ for book in books:
+ books_by_parent.setdefault(book.parent_id, []).append(book)
+
+ orphans = []
+ books_by_author = SortedDict()
+ books_nav = SortedDict()
+ for tag in models.Tag.objects.filter(category='author'):
+ books_by_author[tag] = []
+
+ for book in books_by_parent.get(None,()):
+ authors = list(book.tags.filter(category='author'))
+ if authors:
+ for author in authors:
+ books_by_author[author].append(book)
+ else:
+ orphans.append(book)
+
+ for tag in books_by_author:
+ if books_by_author[tag]:
+ books_nav.setdefault(tag.sort_key[0], []).append(tag)