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