根据导轨使用情况：
$rails new --help
Usage:
rails new APP_PATH [options]
Options:
-b,[--builder=BUILDER] # Path to a application builder (can be a filesystem path or URL)
[--old-style-hash] # Force using old style hash (:foo => 'bar') on Ruby >= 1.9
[--skip-gemfile] # Don't create a Gemfile
这个“应用程序构建器”引用了什么,它与应用程序模板(-m选项)的比较如何？
解决方法
Descriptions in API Doc
The application builder allows you to override elements of the
application generator without being forced to reverse the operations
of the default generator.
简而言之,您可以在创建新的rails应用程序之前定义默认的依赖关系集.