180 lines
6.2 KiB
Ruby
180 lines
6.2 KiB
Ruby
class TopTopic < ActiveRecord::Base
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belongs_to :topic
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def self.periods
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@periods ||= [:yearly, :monthly, :weekly, :daily]
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end
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def self.sort_orders
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@sort_orders ||= [:posts, :views, :likes]
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end
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def self.refresh!
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transaction do
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# update the topics list
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remove_invisible_topics
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add_new_visible_topics
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# update the denormalized data
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TopTopic.periods.each do |period|
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TopTopic.sort_orders.each do |sort|
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TopTopic.send("update_#{sort}_count_for", period)
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end
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# compute top score
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TopTopic.compute_top_score_for(period)
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end
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end
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end
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def self.remove_invisible_topics
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exec_sql("WITH category_definition_topic_ids AS (
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SELECT COALESCE(topic_id, 0) AS id FROM categories
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), invisible_topic_ids AS (
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SELECT id
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FROM topics
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WHERE deleted_at IS NOT NULL
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OR NOT visible
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OR archetype = :private_message
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OR archived
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OR id IN (SELECT id FROM category_definition_topic_ids)
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)
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DELETE FROM top_topics
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WHERE topic_id IN (SELECT id FROM invisible_topic_ids)",
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private_message: Archetype::private_message)
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end
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def self.add_new_visible_topics
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exec_sql("WITH category_definition_topic_ids AS (
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SELECT COALESCE(topic_id, 0) AS id FROM categories
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), visible_topics AS (
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SELECT t.id
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FROM topics t
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LEFT JOIN top_topics tt ON t.id = tt.topic_id
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WHERE t.deleted_at IS NULL
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AND t.visible
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AND t.archetype <> :private_message
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AND NOT t.archived
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AND t.id NOT IN (SELECT id FROM category_definition_topic_ids)
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AND tt.topic_id IS NULL
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)
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INSERT INTO top_topics (topic_id)
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SELECT id FROM visible_topics",
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private_message: Archetype::private_message)
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end
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def self.update_posts_count_for(period)
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sql = "SELECT topic_id, GREATEST(COUNT(*), 1) AS count
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FROM posts
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WHERE created_at >= :from
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AND deleted_at IS NULL
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AND NOT hidden
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AND post_type = #{Post.types[:regular]}
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AND user_id <> #{Discourse.system_user.id}
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GROUP BY topic_id"
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TopTopic.update_top_topics(period, "posts", sql)
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end
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def self.update_views_count_for(period)
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sql = "SELECT parent_id as topic_id, COUNT(*) AS count
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FROM views
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WHERE viewed_at >= :from
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GROUP BY topic_id"
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TopTopic.update_top_topics(period, "views", sql)
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end
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def self.update_likes_count_for(period)
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sql = "SELECT topic_id, GREATEST(SUM(like_count), 1) AS count
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FROM posts
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WHERE created_at >= :from
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AND deleted_at IS NULL
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AND NOT hidden
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AND post_type = #{Post.types[:regular]}
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GROUP BY topic_id"
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TopTopic.update_top_topics(period, "likes", sql)
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end
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def self.compute_top_score_for(period)
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sql = <<-SQL
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WITH top AS (
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SELECT CASE
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WHEN topics.created_at < :from THEN 0
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ELSE log(greatest(#{period}_views_count, 1)) + #{period}_likes_count + #{period}_posts_count * 2
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END AS score,
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topic_id
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FROM top_topics
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LEFT JOIN topics ON topics.id = top_topics.topic_id
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)
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UPDATE top_topics
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SET #{period}_score = top.score
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FROM top
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WHERE top_topics.topic_id = top.topic_id
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AND #{period}_score <> top.score
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SQL
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exec_sql(sql, from: start_of(period))
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end
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def self.start_of(period)
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case period
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when :yearly then 1.year.ago
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when :monthly then 1.month.ago
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when :weekly then 1.week.ago
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when :daily then 1.day.ago
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end
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end
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def self.update_top_topics(period, sort, inner_join)
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exec_sql("UPDATE top_topics
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SET #{period}_#{sort}_count = c.count
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FROM top_topics tt
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INNER JOIN (#{inner_join}) c ON tt.topic_id = c.topic_id
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WHERE tt.topic_id = top_topics.topic_id
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AND tt.#{period}_#{sort}_count <> c.count",
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from: start_of(period))
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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: top_topics
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#
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# id :integer not null, primary key
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# topic_id :integer
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# yearly_posts_count :integer default(0), not null
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# yearly_views_count :integer default(0), not null
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# yearly_likes_count :integer default(0), not null
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# monthly_posts_count :integer default(0), not null
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# monthly_views_count :integer default(0), not null
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# monthly_likes_count :integer default(0), not null
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# weekly_posts_count :integer default(0), not null
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# weekly_views_count :integer default(0), not null
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# weekly_likes_count :integer default(0), not null
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# daily_posts_count :integer default(0), not null
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# daily_views_count :integer default(0), not null
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# daily_likes_count :integer default(0), not null
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# yearly_score :float default(0.0)
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# monthly_score :float default(0.0)
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# weekly_score :float default(0.0)
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# daily_score :float default(0.0)
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#
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# Indexes
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#
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# index_top_topics_on_daily_likes_count (daily_likes_count)
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# index_top_topics_on_daily_posts_count (daily_posts_count)
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# index_top_topics_on_daily_views_count (daily_views_count)
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# index_top_topics_on_monthly_likes_count (monthly_likes_count)
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# index_top_topics_on_monthly_posts_count (monthly_posts_count)
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# index_top_topics_on_monthly_views_count (monthly_views_count)
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# index_top_topics_on_topic_id (topic_id) UNIQUE
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# index_top_topics_on_weekly_likes_count (weekly_likes_count)
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# index_top_topics_on_weekly_posts_count (weekly_posts_count)
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# index_top_topics_on_weekly_views_count (weekly_views_count)
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# index_top_topics_on_yearly_likes_count (yearly_likes_count)
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# index_top_topics_on_yearly_posts_count (yearly_posts_count)
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# index_top_topics_on_yearly_views_count (yearly_views_count)
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#
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