+def counters(request):
+ books = models.Book.objects.count()
+ books_nonempty = models.Book.objects.exclude(html_file='').count()
+ books_empty = models.Book.objects.filter(html_file='').count()
+ books_root = models.Book.objects.filter(parent=None).count()
+
+ media = models.BookMedia.objects.count()
+ media_types = models.BookMedia.objects.values('type').\
+ annotate(count=Count('type')).\
+ order_by('type')
+ for mt in media_types:
+ mt['size'] = sum(b.file.size for b in models.BookMedia.objects.filter(type=mt['type']))
+
+ return render_to_response('catalogue/counters.html',
+ locals(), context_instance=RequestContext(request))
+
+