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PERF: Reduce number of topics to filter while querying for unread.

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This commit is contained in:
Guo Xiang Tan
2017-09-26 12:25:39 +08:00
parent c37598ddbc
commit c06b782cab
2 changed files with 36 additions and 6 deletions
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20
lib/topic_query.rb
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@ -288,8 +288,9 @@ class TopicQuery
list
.where("tu.last_read_post_number < topics.#{col_name}")
.where("COALESCE(tu.notification_level, :regular) >= :tracking",
regular: TopicUser.notification_levels[:regular], tracking: TopicUser.notification_levels[:tracking])
.where("tu.notification_level >= :tracking",
tracking: TopicUser.notification_levels[:tracking]
)
end
def prioritize_pinned_topics(topics, options)
@ -369,6 +370,10 @@ class TopicQuery
result
end
def unread_results_redis_key
"last_unread_result_bumped_at:#{@user.id}"
end
def unread_results(options = {})
result = TopicQuery.unread_filter(
default_results(options.reverse_merge(unordered: true)),
@ -380,6 +385,17 @@ class TopicQuery
result = filter_callback.call(:unread, result, @user, options)
end
if !(last_bumped_at = $redis.get(unread_results_redis_key))
last_bumped_at = result.unscope(:limit, :order).order(:bumped_at).first&.bumped_at
$redis.setex(
unread_results_redis_key,
1.hour.to_i,
(last_bumped_at || Time.zone.now).to_s
)
end
result = result.where("topics.bumped_at >= ?", last_bumped_at) if last_bumped_at
suggested_ordering(result, options)
end