diff --git a/boards/models/post/__init__.py b/boards/models/post/__init__.py
--- a/boards/models/post/__init__.py
+++ b/boards/models/post/__init__.py
@@ -144,17 +144,13 @@ class Post(models.Model, Viewable):
         return self.opening
 
     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
+        # Url is cached only for the "main" thread. When getting url
+        # for other threads, do it manually.
+        url = self.url
 
         if url is None:
+            if thread is None:
+                thread = self.get_thread()
             opening = self.is_opening()
             opening_id = self.id if opening else thread.get_opening_post_id()
             url = reverse('thread', kwargs={'post_id': opening_id})
diff --git a/boards/models/thread.py b/boards/models/thread.py
--- a/boards/models/thread.py
+++ b/boards/models/thread.py
@@ -231,7 +231,7 @@ class Thread(models.Model):
         return self.get_opening_post().pub_time
 
     def __str__(self):
-        return 'T#{}/{}'.format(self.id, self.get_opening_post_id())
+        return 'T#{}'.format(self.id)
 
     def get_tag_url_list(self) -> list:
         return boards.models.Tag.objects.get_tag_url_list(self.get_tags())