match '/:category_slug/:country_slug', :to => 'things#index'

然后，您需要更新操作以使用params查找所有内容[ ：category_slug]和params [：country_slug]而不是ID。查看弹sl的宝石以生成弹ug。

Then you'll need to update your action to look up everything using params[:category_slug] and params[:country_slug] instead of the ids. Look at the slugged gem to generate slugs.