From eb427f7cf4bffaa08f2cbeb7eadb10a3da030124 Mon Sep 17 00:00:00 2001
From: Guo Xiang Tan <tgx_world@hotmail.com>
Date: Wed, 27 Jun 2018 17:18:47 +0800
Subject: [PATCH] PERF: Update `TopicView#participant_count` to use
 `Topic#posts_count`.

Use the counter cache instead of hitting the DB and plucking
every single id.
---
 lib/topic_view.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/topic_view.rb b/lib/topic_view.rb
index be2819d8e1e..09c9b2620ec 100644
--- a/lib/topic_view.rb
+++ b/lib/topic_view.rb
@@ -310,7 +310,7 @@ class TopicView
     @participant_count ||=
       begin
         if participants.size == MAX_PARTICIPANTS
-          if unfiltered_post_ids.length > MAX_POSTS_COUNT_PARTICIPANTS
+          if @topic.posts_count > MAX_POSTS_COUNT_PARTICIPANTS
             @topic.participant_count
           else
             sql = <<~SQL