# File lib/bullet/ext/object.rb, line 8
  def primary_key_value
    if self.class.respond_to?(:primary_keys) && self.class.primary_keys
      self.class.primary_keys.map { |primary_key| send primary_key }.join(','.freeze)
    elsif self.class.respond_to?(:primary_key) && self.class.primary_key
      send self.class.primary_key
    else
      id
    end
  end