Random optimizations.

[wolnelektury.git] / apps / catalogue / templatetags / catalogue_tags.py

diff --git a/apps/catalogue/templatetags/catalogue_tags.py b/apps/catalogue/templatetags/catalogue_tags.py
index ad60962..92827c1 100644 (file)
--- a/apps/catalogue/templatetags/catalogue_tags.py
+++ b/apps/catalogue/templatetags/catalogue_tags.py
@@ -4,6 +4,7 @@
 #
 import datetime
 import feedparser
+from random import randint
 
 from django.conf import settings
 from django import template
@@ -388,9 +389,14 @@ def related_books(book, limit=6, random=1):
                     ignore_by_tag=book.book_tag())[:limit-random]
         cache.set(cache_key, related, 1800)
     if random:
-        related += list(Book.objects.exclude(
-                        pk__in=[b.pk for b in related] + [book.pk]
-                    ).order_by('?')[:random])
+        random_books = Book.objects.exclude(
+                        pk__in=[b.pk for b in related] + [book.pk])
+        if random == 1:
+            count = random_books.count()
+            if count:
+                related.append(random_books[randint(0, count - 1)])
+        else:
+            related += list(random_books.order_by('?')[:random])
     return {
         'books': related,
     }
@@ -407,9 +413,7 @@ def catalogue_menu():
 
 @register.simple_tag
 def tag_url(category, slug):
-    return reverse('catalogue.views.tagged_object_list', args=[
-        '/'.join((Tag.categories_dict[category], slug))
-    ])
+    return Tag.create_url(category, slug)
 
 
 @register.simple_tag