class ScoreCalculator def self.default_score_weights { reply_count: 5, like_score: 15, incoming_link_count: 5, bookmark_count: 2, avg_time: 0.05, reads: 0.2 } end def initialize(weightings=nil) @weightings = weightings || ScoreCalculator.default_score_weights end # Calculate the score for all posts based on the weightings def calculate(min_topic_age=nil) update_posts_score(min_topic_age) update_posts_rank(min_topic_age) update_topics_rank(min_topic_age) update_topics_percent_rank(min_topic_age) end private def update_posts_score(min_topic_age) components = [] @weightings.keys.each { |k| components << "COALESCE(#{k.to_s}, 0) * :#{k.to_s}" } components = components.join(" + ") builder = SqlBuilder.new( "UPDATE posts SET score = x.score FROM (SELECT id, #{components} as score FROM posts) AS x /*where*/" ) builder.where("x.id = posts.id AND (posts.score IS NULL OR x.score <> posts.score)", @weightings) filter_topics(builder, min_topic_age) builder.exec end def update_posts_rank(min_topic_age) builder = SqlBuilder.new("UPDATE posts SET percent_rank = x.percent_rank FROM (SELECT id, percent_rank() OVER (PARTITION BY topic_id ORDER BY SCORE DESC) as percent_rank FROM posts) AS x /*where*/") builder.where("x.id = posts.id AND (posts.percent_rank IS NULL OR x.percent_rank <> posts.percent_rank)") filter_topics(builder, min_topic_age) builder.exec end def update_topics_rank(min_topic_age) builder = SqlBuilder.new("UPDATE topics AS t SET has_summary = (t.like_count >= :likes_required AND t.posts_count >= :posts_required AND x.max_score >= :score_required), score = x.avg_score FROM (SELECT p.topic_id, MAX(p.score) AS max_score, AVG(p.score) AS avg_score FROM posts AS p GROUP BY p.topic_id) AS x /*where*/") builder.where("x.topic_id = t.id AND ( (t.score <> x.avg_score OR t.score IS NULL) OR (t.has_summary IS NULL OR t.has_summary <> ( t.like_count >= :likes_required AND t.posts_count >= :posts_required AND x.max_score >= :score_required )) ) ", likes_required: SiteSetting.summary_likes_required, posts_required: SiteSetting.summary_posts_required, score_required: SiteSetting.summary_score_threshold) if min_topic_age builder.where("t.bumped_at > :bumped_at ", bumped_at: min_topic_age) end builder.exec end def update_topics_percent_rank(min_topic_age) builder = SqlBuilder.new("UPDATE topics SET percent_rank = x.percent_rank FROM (SELECT id, percent_rank() OVER (ORDER BY SCORE DESC) as percent_rank FROM topics) AS x /*where*/") builder.where("x.id = topics.id AND (topics.percent_rank <> x.percent_rank OR topics.percent_rank IS NULL)") if min_topic_age builder.where("topics.bumped_at > :bumped_at ", bumped_at: min_topic_age) end builder.exec end def filter_topics(builder, min_topic_age) if min_topic_age builder.where('posts.topic_id IN (SELECT id FROM topics WHERE bumped_at > :bumped_at)', bumped_at: min_topic_age) end builder end end