products_controller.rb

module Extensions
  module Spree
    module ProductsController
      extend ActiveSupport::Concern

      include do
        alias_method_chain :accurate_title, :meta_title
      end

      def accurate_title_with_meta_title
        return false if !@product
        @product.meta_title.present? ? @product.meta_title : accurate_title_without_meta_title 
      end
    end
  end
end