app/lib/feed_manager.rb


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require 'singleton'

class FeedManager
  include Singleton

  MAX_ITEMS = 800

  def key(type, id)
    "feed:#{type}:#{id}"
  end

  def filter_status?(status, follower)
    replied_to_user = status.reply? ? status.thread.account : nil
    (status.reply? && !(follower.id = replied_to_user.id || follower.following?(replied_to_user)))
  end
end