我看到有 storage :grid_fs
同时又有
# Override the directory where uploaded files will be stored. # This is a sensible default for uploaders that are meant to be mounted: def store_dir "#{model.class.to_s.underscore}" end
同时 我也有 http://www.iteye.com/problems/57595 这位哥们的困惑。
grid_fs 是 mongodb 的文件存储方案。图片是存在 mongodb 里的。 好处是那些零碎小文件被拼成了数据库大文件。备份什么的都很方便。