class ActiveModel::Serializer::Reflection

def include_data?(include_slice)
  include_data_setting = options[:include_data_setting]
  case include_data_setting
  when :if_sideloaded then include_slice.key?(options.fetch(:key, name))
  when true           then true
  when false          then false
  else fail ArgumentError, "Unknown include_data_setting '#{include_data_setting.inspect}'"
  end
end