我曾经把所有东西放到application.css中，然后才有效。但现在我想在我的应用程序中使用一些不错的下拉菜单，而css就是huuge。所以我为application.css所在的同一文件夹中的下拉菜单创建了一个新的css文件：stylesheets
现在看来rails并没有加载新创建的css文件。如何让它加载文件夹中的每个文件？
答案 0 :(得分：2)
使用默认的application.css文件，它包含资产目录中的所有.css文件：
/*
* This is a manifest file that'll be compiled into application.css, which will include all the files
* listed below.
*
* Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
* or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path.
*
* You're free to add application-wide styles to this file and they'll appear at the top of the
* compiled file, but it's generally better to create a new file per style scope.
*
*= require_self
*= require_tree .
*/
答案 1 :(得分：1)
将这两行放入application.css：
*= require_self
*= require_tree .
*= require tree .将要求app/assets/stylesheets，lib/assets/stylesheets和vendor/assets/stylesheets