discourse/app/models/user_stat.rb

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class UserStat < ActiveRecord::Base
belongs_to :user
# Updates the denormalized view counts for all users
def self.update_view_counts
# NOTE: we only update the counts for users we have seen in the last hour
# this avoids a very expensive query that may run on the entire user base
# we also ensure we only touch the table if data changes
# Update denormalized topics_entered
exec_sql "UPDATE user_stats SET topics_entered = X.c
FROM
(SELECT v.user_id,
COUNT(DISTINCT parent_id) AS c
FROM views AS v
WHERE parent_type = 'Topic' AND v.user_id IN (
SELECT u1.id FROM users u1 where u1.last_seen_at > :seen_at
)
GROUP BY v.user_id) AS X
WHERE
X.user_id = user_stats.user_id AND
X.c <> topics_entered
", seen_at: 1.hour.ago
# Update denormalzied posts_read_count
exec_sql "UPDATE user_stats SET posts_read_count = X.c
FROM
(SELECT pt.user_id,
COUNT(*) AS c
FROM post_timings AS pt
WHERE pt.user_id IN (
SELECT u1.id FROM users u1 where u1.last_seen_at > :seen_at
)
GROUP BY pt.user_id) AS X
WHERE X.user_id = user_stats.user_id AND
X.c <> posts_read_count
", seen_at: 1.hour.ago
end
def update_topic_reply_count
self.topic_reply_count =
Topic
.where(['id in (
SELECT topic_id FROM posts p
JOIN topics t2 ON t2.id = p.topic_id
WHERE p.deleted_at IS NULL AND
t2.user_id <> p.user_id AND
p.user_id = ?
)', self.user_id])
.count
end
MAX_TIME_READ_DIFF = 100
# attempt to add total read time to user based on previous time this was called
def update_time_read!
last_seen_key = "user-last-seen:#{id}"
last_seen = $redis.get(last_seen_key)
if last_seen.present?
diff = (Time.now.to_f - last_seen.to_f).round
if diff > 0 && diff < MAX_TIME_READ_DIFF
UserStat.where(user_id: id, time_read: time_read).update_all ["time_read = time_read + ?", diff]
end
end
$redis.set(last_seen_key, Time.now.to_f)
end
end
# == Schema Information
#
# Table name: user_stats
#
# user_id :integer not null, primary key
# has_custom_avatar :boolean default(FALSE), not null
# topics_entered :integer default(0), not null
# time_read :integer default(0), not null
# days_visited :integer default(0), not null
# posts_read_count :integer default(0), not null
# likes_given :integer default(0), not null
# likes_received :integer default(0), not null
# topic_reply_count :integer default(0), not null
#