discourse/app/models/topic_view_item.rb

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require 'ipaddr'
# awkward TopicView is taken
class TopicViewItem < ActiveRecord::Base
self.table_name = 'topic_views'
belongs_to :user
validates_presence_of :topic_id, :ip_address, :viewed_at
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def self.add(topic_id, ip, user_id = nil, at = nil, skip_redis = false)
# Only store a view once per day per thing per (user || ip)
at ||= Date.today
redis_key = "view:#{topic_id}:#{at}"
if user_id
redis_key << ":user-#{user_id}"
else
redis_key << ":ip-#{ip}"
end
if skip_redis || $redis.setnx(redis_key, "1")
skip_redis || $redis.expire(redis_key, SiteSetting.topic_view_duration_hours.hours)
TopicViewItem.transaction do
# this is called real frequently, working hard to avoid exceptions
sql = "INSERT INTO topic_views (topic_id, ip_address, viewed_at, user_id)
SELECT :topic_id, :ip_address, :viewed_at, :user_id
WHERE NOT EXISTS (
SELECT 1 FROM topic_views
/*where*/
)"
builder = DB.build(sql)
if !user_id
builder.where("ip_address = :ip_address AND topic_id = :topic_id AND user_id IS NULL")
else
builder.where("user_id = :user_id AND topic_id = :topic_id")
ip = nil # do not store IP of logged in users
end
result = builder.exec(topic_id: topic_id, ip_address: ip, viewed_at: at, user_id: user_id)
Topic.where(id: topic_id).update_all 'views = views + 1'
if result > 0
UserStat.where(user_id: user_id).update_all 'topics_entered = topics_entered + 1' if user_id
end
# Update the views count in the parent, if it exists.
end
end
end
end
# == Schema Information
#
# Table name: topic_views
#
# topic_id :integer not null
# viewed_at :date not null
# user_id :integer
# ip_address :inet
#
# Indexes
#
# index_topic_views_on_topic_id_and_viewed_at (topic_id,viewed_at)
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# index_topic_views_on_user_id_and_viewed_at (user_id,viewed_at)
# index_topic_views_on_viewed_at_and_topic_id (viewed_at,topic_id)
# uniq_ip_or_user_id_topic_views (user_id,ip_address,topic_id) UNIQUE
#