From a1c54220e8e79c4bb0cc20da193888388efe2ba4 Mon Sep 17 00:00:00 2001 From: unarist Date: Fri, 13 Oct 2017 23:53:44 +0900 Subject: [PATCH] Optimize Status#permitted_for 500x (account timeline) (#5373) The main change of this PR is removing `order by visibility` hack. This was introduced to force using of `index_statuses_on_account_id` instead of PK index, but it seems no longer needed probably due to `index_statuses_on_account_id_id`. Removing this avoids reading all rows, so really improves first fetching of the user who has lot of statuses. I have also changed JOIN to IN + subquery, which slightly faster in most cases. --- app/models/status.rb | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/app/models/status.rb b/app/models/status.rb index 624e33395..5a7245613 100644 --- a/app/models/status.rb +++ b/app/models/status.rb @@ -220,9 +220,7 @@ class Status < ApplicationRecord # non-followers can see everything that isn't private/direct, but can see stuff they are mentioned in. visibility.push(:private) if account.following?(target_account) - joins("LEFT OUTER JOIN mentions ON statuses.id = mentions.status_id AND mentions.account_id = #{account.id}") - .where(arel_table[:visibility].in(visibility).or(Mention.arel_table[:id].not_eq(nil))) - .order(visibility: :desc) + where(visibility: visibility).or(where(id: account.mentions.select(:status_id))) end end