From b513e66578cea6ba74820c0bc49c579705ba3001 Mon Sep 17 00:00:00 2001
From: "byte[]" <byteslice@airmail.cc>
Date: Thu, 20 Apr 2023 14:02:24 -0400
Subject: [PATCH] Clear deleted posts and topics from listings

---
 lib/philomena/posts.ex  | 12 ++++++++++++
 lib/philomena/topics.ex | 21 +++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/lib/philomena/posts.ex b/lib/philomena/posts.ex
index cefde12c..7a7fb7a5 100644
--- a/lib/philomena/posts.ex
+++ b/lib/philomena/posts.ex
@@ -222,11 +222,23 @@ defmodule Philomena.Posts do
       |> select([r], r.id)
       |> update(set: [open: false, state: "closed", admin_id: ^user.id])
 
+    topics =
+      Topic
+      |> where(last_post_id: ^post.id)
+      |> update(set: [last_post_id: nil])
+
+    forums =
+      Forum
+      |> where(last_post_id: ^post.id)
+      |> update(set: [last_post_id: nil])
+
     post = Post.hide_changeset(post, attrs, user)
 
     Multi.new()
     |> Multi.update(:post, post)
     |> Multi.update_all(:reports, reports, [])
+    |> Multi.update_all(:topics, topics, [])
+    |> Multi.update_all(:forums, forums, [])
     |> Repo.transaction()
     |> case do
       {:ok, %{post: post, reports: {_count, reports}}} ->
diff --git a/lib/philomena/topics.ex b/lib/philomena/topics.ex
index 8adeb927..4892c06d 100644
--- a/lib/philomena/topics.ex
+++ b/lib/philomena/topics.ex
@@ -268,8 +268,25 @@ defmodule Philomena.Topics do
   end
 
   def hide_topic(topic, deletion_reason, user) do
-    Topic.hide_changeset(topic, deletion_reason, user)
-    |> Repo.update()
+    topic_changes = Topic.hide_changeset(topic, deletion_reason, user)
+
+    forums =
+      Forum
+      |> join(:inner, [f], _ in assoc(f, :last_post))
+      |> where([f, p], p.topic_id == ^topic.id)
+      |> update(set: [last_post_id: nil])
+
+    Multi.new()
+    |> Multi.update(:topic, topic_changes)
+    |> Multi.update_all(:forums, forums, [])
+    |> Repo.transaction()
+    |> case do
+      {:ok, %{topic: topic}} ->
+        {:ok, topic}
+
+      error ->
+        error
+    end
   end
 
   def unhide_topic(topic) do