require_dependency "distributed_memoizer" class TopTopic < ActiveRecord::Base belongs_to :topic # The top topics we want to refresh often def self.refresh_daily! transaction do remove_invisible_topics add_new_visible_topics update_counts_and_compute_scores_for(:daily) end end # We don't have to refresh these as often def self.refresh_older! older_periods = periods - [:daily,:all] transaction do older_periods.each do |period| update_counts_and_compute_scores_for(period) end end compute_top_score_for(:all) end def self.refresh! refresh_daily! refresh_older! end def self.periods @@periods ||= [:all, :yearly, :quarterly, :monthly, :weekly, :daily].freeze end def self.sorted_periods ascending_periods ||= Enum.new(daily: 1, weekly: 2, monthly: 3, quarterly: 4, yearly: 5, all: 6) end private def self.sort_orders @@sort_orders ||= [:posts, :views, :likes, :op_likes].freeze end def self.update_counts_and_compute_scores_for(period) sort_orders.each do |sort| TopTopic.send("update_#{sort}_count_for", period) end compute_top_score_for(period) end def self.remove_invisible_topics exec_sql("WITH category_definition_topic_ids AS ( SELECT COALESCE(topic_id, 0) AS id FROM categories ), invisible_topic_ids AS ( SELECT id FROM topics WHERE deleted_at IS NOT NULL OR NOT visible OR archetype = :private_message OR archived OR id IN (SELECT id FROM category_definition_topic_ids) ) DELETE FROM top_topics WHERE topic_id IN (SELECT id FROM invisible_topic_ids)", private_message: Archetype::private_message) end def self.add_new_visible_topics exec_sql("WITH category_definition_topic_ids AS ( SELECT COALESCE(topic_id, 0) AS id FROM categories ), visible_topics AS ( SELECT t.id FROM topics t LEFT JOIN top_topics tt ON t.id = tt.topic_id WHERE t.deleted_at IS NULL AND t.visible AND t.archetype <> :private_message AND NOT t.archived AND t.id NOT IN (SELECT id FROM category_definition_topic_ids) AND tt.topic_id IS NULL ) INSERT INTO top_topics (topic_id) SELECT id FROM visible_topics", private_message: Archetype::private_message) end def self.update_posts_count_for(period) sql = "SELECT topic_id, GREATEST(COUNT(*), 1) AS count FROM posts WHERE created_at >= :from AND deleted_at IS NULL AND NOT hidden AND post_type = #{Post.types[:regular]} AND user_id <> #{Discourse.system_user.id} GROUP BY topic_id" update_top_topics(period, "posts", sql) end def self.update_views_count_for(period) sql = "SELECT topic_id, COUNT(*) AS count FROM topic_views WHERE viewed_at >= :from GROUP BY topic_id" update_top_topics(period, "views", sql) end def self.update_likes_count_for(period) sql = "SELECT topic_id, SUM(like_count) AS count FROM posts WHERE created_at >= :from AND deleted_at IS NULL AND NOT hidden AND post_type = #{Post.types[:regular]} GROUP BY topic_id" update_top_topics(period, "likes", sql) end def self.update_op_likes_count_for(period) sql = "SELECT topic_id, like_count AS count FROM posts WHERE created_at >= :from AND post_number = 1 AND deleted_at IS NULL AND NOT hidden AND post_type = #{Post.types[:regular]}" update_top_topics(period, "op_likes", sql) end def self.compute_top_score_for(period) log_views_multiplier = SiteSetting.top_topics_formula_log_views_multiplier.to_f log_views_multiplier = 2 if log_views_multiplier == 0 first_post_likes_multiplier = SiteSetting.top_topics_formula_first_post_likes_multiplier.to_f first_post_likes_multiplier = 0.5 if first_post_likes_multiplier == 0 least_likes_per_post_multiplier = SiteSetting.top_topics_formula_least_likes_per_post_multiplier.to_f least_likes_per_post_multiplier = 3 if least_likes_per_post_multiplier == 0 if period == :all top_topics = "( SELECT t.like_count all_likes_count, t.id topic_id, t.posts_count all_posts_count, p.like_count all_op_likes_count, t.views all_views_count FROM topics t JOIN posts p ON p.topic_id = t.id AND p.post_number = 1 ) as top_topics" time_filter = "false" else top_topics = "top_topics" time_filter = "topics.created_at < :from" end sql = <<-SQL WITH top AS ( SELECT CASE WHEN #{time_filter} THEN 0 ELSE log(GREATEST(#{period}_views_count, 1)) * #{log_views_multiplier} + #{period}_op_likes_count * #{first_post_likes_multiplier} + CASE WHEN #{period}_likes_count > 0 AND #{period}_posts_count > 0 THEN LEAST(#{period}_likes_count / #{period}_posts_count, #{least_likes_per_post_multiplier}) ELSE 0 END + CASE WHEN topics.posts_count < 10 THEN 0 - ((10 - topics.posts_count) / 20) * #{period}_op_likes_count ELSE 10 END + log(GREATEST(#{period}_posts_count, 1)) END AS score, topic_id FROM #{top_topics} LEFT JOIN topics ON topics.id = top_topics.topic_id AND topics.deleted_at IS NULL ) UPDATE top_topics SET #{period}_score = top.score FROM top WHERE top_topics.topic_id = top.topic_id AND #{period}_score <> top.score SQL exec_sql(sql, from: start_of(period)) end def self.start_of(period) case period when :yearly then 1.year.ago when :monthly then 1.month.ago when :quarterly then 3.months.ago when :weekly then 1.week.ago when :daily then 1.day.ago end end def self.update_top_topics(period, sort, inner_join) exec_sql("UPDATE top_topics SET #{period}_#{sort}_count = c.count FROM top_topics tt INNER JOIN (#{inner_join}) c ON tt.topic_id = c.topic_id WHERE tt.topic_id = top_topics.topic_id AND tt.#{period}_#{sort}_count <> c.count", from: start_of(period)) end end # == Schema Information # # Table name: top_topics # # id :integer not null, primary key # topic_id :integer # yearly_posts_count :integer default(0), not null # yearly_views_count :integer default(0), not null # yearly_likes_count :integer default(0), not null # monthly_posts_count :integer default(0), not null # monthly_views_count :integer default(0), not null # monthly_likes_count :integer default(0), not null # weekly_posts_count :integer default(0), not null # weekly_views_count :integer default(0), not null # weekly_likes_count :integer default(0), not null # daily_posts_count :integer default(0), not null # daily_views_count :integer default(0), not null # daily_likes_count :integer default(0), not null # daily_score :float default(0.0) # weekly_score :float default(0.0) # monthly_score :float default(0.0) # yearly_score :float default(0.0) # all_score :float default(0.0) # daily_op_likes_count :integer default(0), not null # weekly_op_likes_count :integer default(0), not null # monthly_op_likes_count :integer default(0), not null # yearly_op_likes_count :integer default(0), not null # quarterly_posts_count :integer default(0), not null # quarterly_views_count :integer default(0), not null # quarterly_likes_count :integer default(0), not null # quarterly_score :float default(0.0) # quarterly_op_likes_count :integer default(0), not null # # Indexes # # index_top_topics_on_all_score (all_score) # index_top_topics_on_daily_likes_count (daily_likes_count) # index_top_topics_on_daily_op_likes_count (daily_op_likes_count) # index_top_topics_on_daily_posts_count (daily_posts_count) # index_top_topics_on_daily_score (daily_score) # index_top_topics_on_daily_views_count (daily_views_count) # index_top_topics_on_monthly_likes_count (monthly_likes_count) # index_top_topics_on_monthly_op_likes_count (monthly_op_likes_count) # index_top_topics_on_monthly_posts_count (monthly_posts_count) # index_top_topics_on_monthly_score (monthly_score) # index_top_topics_on_monthly_views_count (monthly_views_count) # index_top_topics_on_quarterly_likes_count (quarterly_likes_count) # index_top_topics_on_quarterly_op_likes_count (quarterly_op_likes_count) # index_top_topics_on_quarterly_posts_count (quarterly_posts_count) # index_top_topics_on_quarterly_views_count (quarterly_views_count) # index_top_topics_on_topic_id (topic_id) UNIQUE # index_top_topics_on_weekly_likes_count (weekly_likes_count) # index_top_topics_on_weekly_op_likes_count (weekly_op_likes_count) # index_top_topics_on_weekly_posts_count (weekly_posts_count) # index_top_topics_on_weekly_score (weekly_score) # index_top_topics_on_weekly_views_count (weekly_views_count) # index_top_topics_on_yearly_likes_count (yearly_likes_count) # index_top_topics_on_yearly_op_likes_count (yearly_op_likes_count) # index_top_topics_on_yearly_posts_count (yearly_posts_count) # index_top_topics_on_yearly_score (yearly_score) # index_top_topics_on_yearly_views_count (yearly_views_count) #