Replace incorrect use of distinct with group (#14675)

Some uses of ActiveRecord::QueryMethods#distinct pass field names but they
are incorrect for the current version of Rails.

ActiveRecord::QueryMethods#group provides the expected behavior and
benefits performance. See commit 6da24aad4cafdef8d8a2c92bac2002a5fc2fe9c8.

1 files changed, 1 insertions, 3 deletions

diff --git a/app/controllers/api/v1/timelines/public_controller.rb b/app/controllers/api/v1/timelines/public_controller.rb
index c6e7854d9..6ca903c16 100644
--- a/app/controllers/api/v1/timelines/public_controller.rb
+++ b/app/controllers/api/v1/timelines/public_controller.rb
@@ -30,9 +30,7 @@ class Api::V1::Timelines::PublicController < Api::BaseController
     )
 
     if truthy_param?(:only_media)
-      # `SELECT DISTINCT id, updated_at` is too slow, so pluck ids at first, and then select id, updated_at with ids.
-      status_ids = statuses.joins(:media_attachments).distinct(:id).pluck(:id)
-      statuses.where(id: status_ids)
+      statuses.joins(:media_attachments).group(:id)
     else
       statuses
     end