Rebuild refmap after post from it was deleted

boards/models/post/__init__.py

@@ -116,14 +116,19 b' class Post(models.Model, Viewable):'
 
         return title
 
-    def build_refmap(self) -> None:
+    def build_refmap(self, excluded_ids=None) -> None:
         """
         Builds a replies map string from replies list. This is a cache to stop
         the server from recalculating the map on every post show.
         """
 
-        post_urls = [refpost.get_link_view()
-                     for refpost in self.referenced_posts.all()]
+        replies = self.referenced_posts
+        if excluded_ids is not None:
+            replies = replies.exclude(id__in=excluded_ids)
+        else:
+            replies = replies.all()
+
+        post_urls = [refpost.get_link_view() for refpost in replies]
 
         self.refmap = ', '.join(post_urls)
 

boards/signals.py

@@ -106,3 +106,10 b' def generate_thumb(instance, **kwargs):'
                 if not thumb_name == thumb_name_:
                     raise ValueError(
                         'There is already a file named %s' % thumb_name_)
+
+
+@receiver(pre_delete, sender=Post)
+def rebuild_refmap(instance, **kwargs):
+    for referenced_post in instance.refposts.all():
+        referenced_post.build_refmap(excluded_ids=[instance.id])
+        referenced_post.save(update_fields=['refmap'])