discourse/app/models/topic_posters_summary.rb

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# This is used in topic lists
require_dependency 'topic_poster'
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class TopicPostersSummary
attr_reader :topic, :options
def initialize(topic, options = {})
@topic = topic
@options = options
end
def summary
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sorted_top_posters.compact.map(&method(:new_topic_poster_for))
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end
private
def new_topic_poster_for(user)
TopicPoster.new.tap do |topic_poster|
topic_poster.user = user
topic_poster.description = descriptions_for(user)
topic_poster.primary_group = primary_group_lookup[user.id]
if topic.last_post_user_id == user.id
topic_poster.extras = 'latest'
topic_poster.extras << ' single' if user_ids.uniq.size == 1
end
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end
end
def descriptions_by_id
@descriptions_by_id ||= begin
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user_ids_with_descriptions.each_with_object({}) do |(id, description), descriptions|
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descriptions[id] ||= []
descriptions[id] << description
end
end
end
def descriptions_for(user)
descriptions_by_id[user.id].join ', '
end
def shuffle_last_poster_to_back_in(summary)
unless last_poster_is_topic_creator?
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summary.reject! { |u| u.id == topic.last_post_user_id }
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summary << avatar_lookup[topic.last_post_user_id]
end
summary
end
def user_ids_with_descriptions
user_ids.zip([
:original_poster,
:most_recent_poster,
:frequent_poster,
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:frequent_poster,
:frequent_poster,
:frequent_poster
].map { |description| I18n.t(description) })
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end
def last_poster_is_topic_creator?
topic.user_id == topic.last_post_user_id
end
def sorted_top_posters
shuffle_last_poster_to_back_in top_posters
end
def top_posters
user_ids.map { |id| avatar_lookup[id] }.compact.uniq.take(5)
end
def user_ids
[ topic.user_id, topic.last_post_user_id, *topic.featured_user_ids ]
end
def avatar_lookup
@avatar_lookup ||= options[:avatar_lookup] || AvatarLookup.new(user_ids)
end
def primary_group_lookup
@primary_group_lookup ||= options[:primary_group_lookup] || PrimaryGroupLookup.new(user_ids)
end
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end