discourse/app/models/topic_participants_summary.rb

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# This is used on a topic page
class TopicParticipantsSummary
attr_reader :topic, :options
def initialize(topic, options = {})
@topic = topic
@options = options
@user = options[:user]
end
def summary
top_participants.compact.map(&method(:new_topic_poster_for))
end
def new_topic_poster_for(user)
TopicPoster.new.tap do |topic_poster|
topic_poster.user = user
topic_poster.extras = 'latest' if is_latest_poster?(user)
end
end
def is_latest_poster?(user)
topic.last_post_user_id == user.id
end
def top_participants
user_ids.map { |id| avatar_lookup[id] }.compact.uniq.take(4)
end
def user_ids
return [] unless @user
[topic.user_id] + topic.allowed_user_ids - [@user.id]
end
def avatar_lookup
@avatar_lookup ||= options[:avatar_lookup] || AvatarLookup.new(user_ids)
end
end