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100 lines
2.5 KiB
Ruby
100 lines
2.5 KiB
Ruby
class TopicFeaturedUsers
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attr_reader :topic
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def initialize(topic)
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@topic = topic
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end
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def self.count
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4
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end
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# Chooses which topic users to feature
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def choose(args={})
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clear
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update keys(args)
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update_participant_count
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topic.save
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end
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def user_ids
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[topic.featured_user1_id,
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topic.featured_user2_id,
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topic.featured_user3_id,
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topic.featured_user4_id].uniq.compact
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end
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def self.ensure_consistency!
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sql = <<SQL
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WITH cte as (
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SELECT
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t.id, p.user_id,
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ROW_NUMBER() OVER(PARTITION BY t.id ORDER BY COUNT(*) DESC) as rank
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FROM topics t
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JOIN posts p ON p.topic_id = t.id
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WHERE p.deleted_at IS NULL AND NOT p.hidden AND p.user_id <> t.user_id AND
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p.user_id <> t.last_post_user_id
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GROUP BY t.id, p.user_id
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)
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UPDATE topics tt
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SET
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featured_user1_id = featured_user1,
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featured_user2_id = featured_user2,
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featured_user3_id = featured_user3,
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featured_user4_id = featured_user4
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FROM (
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SELECT
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c.id,
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MAX(case when c.rank = 1 then c.user_id end) featured_user1,
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MAX(case when c.rank = 2 then c.user_id end) featured_user2,
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MAX(case when c.rank = 3 then c.user_id end) featured_user3,
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MAX(case when c.rank = 4 then c.user_id end) featured_user4
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FROM cte as c
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WHERE c.rank <= 4
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GROUP BY c.id
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) x
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WHERE x.id = tt.id AND
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(
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COALESCE(featured_user1_id,-99) <> COALESCE(featured_user1,-99) OR
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COALESCE(featured_user2_id,-99) <> COALESCE(featured_user2,-99) OR
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COALESCE(featured_user3_id,-99) <> COALESCE(featured_user3,-99) OR
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COALESCE(featured_user4_id,-99) <> COALESCE(featured_user4,-99)
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)
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SQL
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Topic.exec_sql(sql)
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end
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private
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def keys(args)
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# Don't include the OP or the last poster
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to_feature = topic.posts.where('user_id NOT IN (?, ?)', topic.user_id, topic.last_post_user_id)
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# Exclude a given post if supplied (in the case of deletes)
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to_feature = to_feature.where("id <> ?", args[:except_post_id]) if args[:except_post_id].present?
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# Assign the featured_user{x} columns
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to_feature.group(:user_id).order('count_all desc').limit(TopicFeaturedUsers.count).count.keys
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end
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def clear
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TopicFeaturedUsers.count.times do |i|
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topic.send("featured_user#{i+1}_id=", nil)
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end
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end
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def update(user_keys)
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user_keys.each_with_index do |user_id, i|
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topic.send("featured_user#{i+1}_id=", user_id)
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end
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end
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def update_participant_count
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topic.participant_count = topic.posts.count('distinct user_id')
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end
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end
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