Show updated thread's link in favorite's new multipost

boards/models/post/__init__.py

@@ -134,15 +134,24 b' class Post(models.Model, Viewable):'
 
         return self.opening
 
-    def get_absolute_url(self):
-        if self.url:
-            return self.url
-        else:
-            opening_id = self.get_thread().get_opening_post_id()
-            post_url = reverse('thread', kwargs={'post_id': opening_id})
+    def get_absolute_url(self, thread=None):
+        url = None
+
+        if thread is None:
+            thread = self.get_thread()
+
+            # Url is cached only for the "main" thread. When getting url
+            # for other threads, do it manually.
+            if self.url:
+                url = self.url
+
+        if url is None:
+            opening_id = thread.get_opening_post_id()
+            url = reverse('thread', kwargs={'post_id': opening_id})
             if self.id != opening_id:
-                post_url += '#' + str(self.id)
-            return post_url
+                url += '#' + str(self.id)
+
+        return url
 
     def get_thread(self):
         return self.thread
@@ -330,7 +339,6 b' class Post(models.Model, Viewable):'
         """
         Gets view of a reflink to the post.
         """
-
         result = '<a href="{}">&gt;&gt;{}</a>'.format(self.get_absolute_url(),
                                                       self.id)
         if self.is_opening():

boards/views/api.py

@@ -273,7 +273,7 b' def api_get_new_posts(request):'
                 new_post_count = thread.new_post_count
                 fav_thread_dict['newest_post_link'] = thread.get_replies()\
                         .filter(id__gt=fav_threads[str(op.id)])\
-                        .first().get_absolute_url()
+                        .first().get_absolute_url(thread=thread)
             else:
                 new_post_count = 0
             fav_thread_dict['new_post_count'] = new_post_count