class TopicTimestampChanger class InvalidTimestampError < StandardError; end def initialize(timestamp:, topic: nil, topic_id: nil) @topic = topic || Topic.with_deleted.find(topic_id) @posts = @topic.posts @current_timestamp = Time.zone.now @timestamp = Time.zone.at(timestamp) raise InvalidTimestampError if @timestamp.to_f > @current_timestamp.to_f @time_difference = calculate_time_difference end def change! ActiveRecord::Base.transaction do last_posted_at = @timestamp @posts.each do |post| if post.is_first_post? update_post(post, @timestamp) else new_created_at = Time.at(post.created_at.to_f + @time_difference) new_created_at = @current_timestamp if new_created_at > @current_timestamp last_posted_at = new_created_at if new_created_at > last_posted_at update_post(post, new_created_at) end end update_topic(last_posted_at) yield(@topic) if block_given? end # Burst the cache for stats [AdminDashboardData, About].each { |klass| $redis.del klass.stats_cache_key } end private def calculate_time_difference @timestamp - @topic.created_at end def update_topic(last_posted_at) @topic.update_attributes( created_at: @timestamp, updated_at: @timestamp, bumped_at: @timestamp, last_posted_at: last_posted_at ) end def update_post(post, timestamp) post.update_attributes(created_at: timestamp, updated_at: timestamp) end end