class TopicFeaturedUsers attr_reader :topic def initialize(topic) @topic = topic end def self.count 4 end # Chooses which topic users to feature def choose(args={}) topic.reload unless rails4? clear update keys(args) topic.save end def user_ids [topic.featured_user1_id, topic.featured_user2_id, topic.featured_user3_id, topic.featured_user4_id].uniq.compact end private def keys(args) # Don't include the OP or the last poster to_feature = topic.posts.where('user_id NOT IN (?, ?)', topic.user_id, topic.last_post_user_id) # Exclude a given post if supplied (in the case of deletes) to_feature = to_feature.where("id <> ?", args[:except_post_id]) if args[:except_post_id].present? # Assign the featured_user{x} columns to_feature.group(:user_id).order('count_all desc').limit(TopicFeaturedUsers.count).count.keys end def clear TopicFeaturedUsers.count.times do |i| topic.send("featured_user#{i+1}_id=", nil) end end def update(user_keys) user_keys.each_with_index do |user_id, i| topic.send("featured_user#{i+1}_id=", user_id) end end end