Keep references to all reblogs of a status on home feed (#5419)

* Keep references to all reblogs of a status on home feed

When inserting reblog: Add to set of reblogs of this status on
the feed, if original status was present in the feed, add it to
that set as well.

When removing a reblog: Remove it from that set. Take random
remaining item from the set. If one exists, re-insert it into feed,
otherwise do not re-insert anything.

Fix #4210

* When original is removed, toss out reblog references

1 files changed, 3 insertions, 2 deletions

diff --git a/app/workers/scheduler/feed_cleanup_scheduler.rb b/app/workers/scheduler/feed_cleanup_scheduler.rb
index dbebaa2c3..222f5ed84 100644
--- a/app/workers/scheduler/feed_cleanup_scheduler.rb
+++ b/app/workers/scheduler/feed_cleanup_scheduler.rb
@@ -6,8 +6,9 @@ class Scheduler::FeedCleanupScheduler
 
   def perform
     redis.pipelined do
-      inactive_users.pluck(:account_id).each do |account_id|
+      inactive_users.each do |account_id|
         redis.del(FeedManager.instance.key(:home, account_id))
+        redis.del(FeedManager.instance.key(:home, account_id, 'reblogs'))
       end
     end
   end
@@ -15,7 +16,7 @@ class Scheduler::FeedCleanupScheduler
   private
 
   def inactive_users
-    User.confirmed.inactive
+    @inactive_users ||= User.confirmed.inactive.pluck(:account_id)
   end
 
   def redis