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PERF: Keep track of first unread PM and first unread group PM for user.

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This optimization helps to filter away topics so that the joins on
related tables when querying for unread messages is not expensive.
This commit is contained in:
Guo Xiang Tan
2020-09-03 14:02:15 +08:00
committed by Alan Guo Xiang Tan
parent 0398271f87
commit 9b75d95fc6
11 changed files with 326 additions and 6 deletions
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16
lib/topic_query.rb
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@ -960,9 +960,19 @@ class TopicQuery
def unread_messages(params)
query = TopicQuery.unread_filter(
messages_for_groups_or_user(params[:my_group_ids]),
@user&.id,
staff: @user&.staff?)
.limit(params[:count])
@user.id,
staff: @user.staff?
)
first_unread_pm_at =
if params[:my_group_ids].present?
GroupUser.where(user_id: @user.id, group_id: params[:my_group_ids]).minimum(:first_unread_pm_at)
else
UserStat.where(user_id: @user.id).pluck(:first_unread_pm_at).first
end
query = query.where("topics.updated_at >= ?", first_unread_pm_at) if first_unread_pm_at
query = query.limit(params[:count]) if params[:count]
query
end