From 3b7a7db0caf2a64d135bed827171135856a9a7d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lera=20Elvo=C3=A9?= <yagich@poto.cafe>
Date: Tue, 3 Jun 2025 05:56:28 +0300
Subject: [PATCH] add latest post info to topics view

---
 apps/topics.lua           | 40 ++++++++++++++++++++++++++++++++++++++-
 views/topics/topics.etlua | 12 +++++++++---
 2 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/apps/topics.lua b/apps/topics.lua
index fadf4a9..2b49a0b 100644
--- a/apps/topics.lua
+++ b/apps/topics.lua
@@ -24,7 +24,7 @@ local ThreadCreateError = {
 app:get("all_topics", "", function(self)
   self.topic_list = db.query([[
     SELECT
-      topics.name, topics.slug, topics.description, topics.is_locked,
+      topics.id, topics.name, topics.slug, topics.description, topics.is_locked,
       users.username AS latest_thread_username,
       threads.title AS latest_thread_title,
       threads.slug AS latest_thread_slug,
@@ -43,6 +43,44 @@ app:get("all_topics", "", function(self)
     ORDER BY
       topics.sort_order ASC
   ]])
+  
+  local active_threads_raw = db.query([[
+    WITH ranked_threads AS (
+      SELECT
+        threads.topic_id, threads.id AS thread_id, threads.title AS thread_title, threads.slug AS thread_slug,
+        posts.id AS post_id, posts.created_at AS post_created_at,
+        users.username,
+        ROW_NUMBER() OVER (PARTITION BY threads.topic_id ORDER BY posts.created_at DESC) AS rn
+      FROM
+        threads
+      JOIN
+        posts ON threads.id = posts.thread_id
+      LEFT JOIN
+        users ON posts.user_id = users.id
+    )
+    SELECT
+      topic_id,
+      thread_id, thread_title, thread_slug,
+      post_id, post_created_at,
+      username
+    FROM
+      ranked_threads
+    WHERE
+      rn = 1
+    ORDER BY
+      topic_id
+  ]])
+   self.active_threads = {}
+   for _, thread in ipairs(active_threads_raw) do
+    self.active_threads[tonumber(thread.topic_id)] = {
+      thread_title = thread.thread_title,
+      thread_slug = thread.thread_slug,
+      post_id = thread.post_id,
+      username = thread.username,
+      post_created_at = thread.post_created_at,
+    }
+   end
+  
   self.me = util.get_logged_in_user_or_transient(self)
   return {render = "topics.topics"}
 end)
diff --git a/views/topics/topics.etlua b/views/topics/topics.etlua
index 95d3d35..bd11fcb 100644
--- a/views/topics/topics.etlua
+++ b/views/topics/topics.etlua
@@ -20,9 +20,15 @@
         <a class="thread-title" href=<%= url_for("topic", {slug = topic.slug}) %>><%= topic.name %></a>
         <%= topic.description %>
         <% if topic.latest_thread_username then %>
-        <span>
-          Latest thread: <a href="<%= url_for("thread", {slug = topic.latest_thread_slug}) %>"><%= topic.latest_thread_title %></a> by <a href="<%= url_for("user", {username = topic.latest_thread_username}) %>"><%= topic.latest_thread_username %></a> on <% render("views.common.timestamp", {timestamp = topic.latest_thread_created_at}) -%>
-        </span>
+          <span>
+            Latest thread: <a href="<%= url_for("thread", {slug = topic.latest_thread_slug}) %>"><%= topic.latest_thread_title %></a> by <a href="<%= url_for("user", {username = topic.latest_thread_username}) %>"><%= topic.latest_thread_username %></a> on <% render("views.common.timestamp", {timestamp = topic.latest_thread_created_at}) -%>
+          </span>
+          <% if active_threads[topic.id] then %>
+            <% local thread = active_threads[topic.id] %>
+            <span>
+              Latest post in: <a href="<%= url_for("thread", {slug = thread.thread_slug}) %>"><%= thread.thread_title %></a> by <a href="<%= url_for("user", {username = thread.username}) %>"><%= thread.username %></a> at <a href="<%= get_post_url(thread.post_id) %>"><% render("views.common.timestamp", {timestamp = thread.post_created_at}) -%></a>
+            </span>
+          <% end %>
         <% else %>
         <i>No threads yet.</i>
         <% end %>