module Playbook::Flex

def flex_props
  selected_props = flex_options.keys.select { |sk| try(sk) }
  return nil unless selected_props.present?
  selected_props.map do |k|
    flex_value = send(k)
    if flex_value.is_a?(Hash)
      flex_value.map do |media_size, value|
        "flex_#{media_size}_#{value}" if flex_values.include? value.to_s
      end
    else
      "flex_#{flex_value}" if flex_values.include? flex_value.to_s
    end
  end.compact.join(" ")
end